atelNum int64 1 15.2k | title stringlengths 8 376 | authors stringlengths 3 6.6k | body stringlengths 11 5.12k | submissionDate stringlengths 19 19 | keywords stringlengths 4 185 |
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701 | Discovery of Optical Transient TSS J004150.4+404222 in M31 | R. Quimby, F. Castro, M. Sellers, P. Hoeflich, E. L. Robinson, J. C. Wheeler (University of Texas), and A. Shafter (SDSU) | We report the discovery of an optical transient near M31 using unfiltered CCD images taken on 2006 Jan 5.08 UT (about 17.2 mag) and Jan 9.08 (about 16.9 mag) using the 0.45m ROTSE-IIIb telescope at the McDonald Observatory. The object is located at RA = 00h41m50.42s DEC = +40o42'22.5" (J2000), which is 10' 7.7" west an... | 2006-01-21 02:22:00 | optical,cataclysmic variable,nova,star,transient,variables |
702 | Swift/XRT localization of XRT J1701-462 | J. A. Kennea (PSU), F. Marshall(GSFC), D. Steeghs (CFA), C. Markwardt (GSFC/UMD), D. N. Burrows (PSU), M. Torres (CfA), J. Miller (U. Michigan), S. Hunsberger (PSU), J. Nousek (PSU) and N. Gehrels (GSFC) | At 19:16 UT on January 20th, 2005, Swift began a target of opportunity observation of the RXTE discovered transient XTE J1701-462 (ATEL#696, #700). The Swift/XRT on-board centroiding algorithm located a bright, previously uncatalogued point source at the following coordinates: RA(J2000): 17:00:57.2 Dec(J2000): -46:11:1... | 2006-01-21 03:35:00 | x-ray,transient |
703 | RXTE Pointed Observations of XTE J1701-462 | T. E. Strohmayer, J. H. Swank (NASA/GSFC), E. H. Morgan (MIT), C. B. Markwardt (NASA/GSFC &UMD), N. Shaposhnikov (NASA/GSFC & USRA) | The RXTE PCA and HEXTE observed the new transient XTE J1701-462 (Remillard et al, ATEL #696) first on 19 Jan 2006 at 18:00 UT for 3800 seconds. Observations on 20 Jan (Markwardt & Swank, ATEL #700) included several pointed observations. The fluxes on 19 Jan were 1.7e-8 and 2.8e-9 ergs cm^-2 s^-1 in the 2-10 keV and 10-... | 2006-01-21 10:02:00 | x-ray,binary,black hole,neutron star,pulsar,star,transient,request for observations |
704 | Swift X-ray Spectrum and V-band Upper Limit for XTE J1701-462 | J. A. Kennea (PSU), F. E. Marshall(GSFC), D. Steeghs (CFA), C. Markwardt (GSFC/UMD), D. N. Burrows (PSU), M. Torres (CfA), J. Miller, S. Hunsberger (PSU), J. Nousek (PSU) and N. Gehrels (GSFC) | We have analyzed the 500s of Swift/XRT data on the newly discovered X-ray transient XTE J1701-462 (ATEL #696, #700, #702). The source was bright, with a count rate approximately 230 counts/s, which does not vary significantly during the observation. The spectrum is well fit by an absorbed power-law model with NH = (2.7... | 2006-01-21 12:28:00 | optical,x-ray,binary,black hole,neutron star,star,transient |
705 | Discovery and Classification of Three Supernovae | The Nearby Supernova Factory: G. Aldering, S. Bailey, S. Bongard, D. Kocevski, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. A. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), N. Blanc, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyo... | The Nearby Supernova Factory reports the discovery and classification of three supernovae in images obtained using the QUEST II camera on the Palomar Oschin 48-inch telescope as a part of the JPL Near-Earth Asteroid Tracking component of the Palomar Consortium. Discovery image dates and approximate magnitudes (calibrat... | 2006-01-22 01:07:00 | infra-red,optical,ultra-violet,asteroid,supernovae |
706 | Optical Counterpart of J1701-462 | D. Maitra, C. Bailyn, J. Nelan (YALE), J. Espinoza (CTIO/SMARTS) | We obtained H-band images of the SWIFT error field of J1701-462 (ATel #702) using the SMARTS 1.3m telescope and ANDICAM instrument on Jan 21.3707 UT. We find a new object not present in the 2MASS catalogue. The H-band magnitude of the new source was 16.5 +- 0.1 in the Jan 21 data, as determined by comparison with nearb... | 2006-01-22 13:04:00 | infra-red,optical,x-ray,binary,black hole,neutron star,star,transient |
707 | X-ray activity in GX 339-4 | N. Bezayiff and D. M. Smith (U. C. Santa Cruz) | Observations with the Rossi X-ray Timing Explorer (RXTE) show that the suspected black-hole binary GX 339-4 has become active after 8 months in quiescence. Three consecutive monitoring observations taken with the Proportional Counter Array (PCA) on 15 January (20:52 UT), 18 January (18:54 UT), and 21 January (07:38 UT)... | 2006-01-23 10:01:00 | x-ray,binary,black hole,transient,variables,request for observations |
708 | XTE J1701-462 seen by INTEGRAL | N. Produit (ISDC, Geneva), A. Bazzano (IASF, Roma), V. Schoenfelder (MPE, Garching), N.-J. Westergaard (DSRI, Copenhagen), B. McBreen (Univ. College, Dublin), R. Much (ESTEC, Noordwijk), W. Hermsen (SRON, Utrecht), S. Molkov (IKI, Moscow) | The newly discovered X-ray transient XTE J1701-462 (ATEL #696, #700, #702, #703, #704, #706) was in the field of view of the INTEGRAL instruments during a routine Galactic Plane Scan on 2006 Jan. 21 at 03:45 UT, during one pointing of 1850 sec in JEM-X and three pointings in IBIS. It was detected by the JEM-X instrumen... | 2006-01-24 00:18:00 | x-ray,transient |
709 | Probable Optical Counterpart of IGR J00234+6141 | J. P. Halpern (Columbia. U.), N. Mirabal (U. Michigan) | We report a probable identification of the weak hard X-ray source IGR J00234+6141 (den Hartog et al., ATel #394) with a star that has an optical spectrum of a cataclysmic variable. den Hartog et al. noted the presence of a ROSAT All-Sky Survey source 1RXS J002258.3+614111 located 3.15' from the INTEGRAL position and ma... | 2006-01-25 11:15:00 | optical,x-ray,cataclysmic variable,star,variables |
710 | XTE J1701-462: possible radio counterpart | Rob Fender (Southampton), Bob Sault (ATNF), Michael Dahlem (ATNF) | An observation of the field of the new X-ray transient XTE J1701-462 (ATEL #696, #702, #708) was performed with the Australia Telescope Compact Array on 2006 Jan 22. The observation was made simultaneously at 4.8 and 8.6 GHz over a period of approximately 75 minutes beginning 21:45 UT. A radio source is detected at the... | 2006-01-25 18:19:00 | radio,x-ray,binary,black hole,neutron star,star,transient |
711 | Vela X-1 in a highly active state | I. Kreykenbohm (ISDC, Geneva & IAA, Tuebingen), R. Staubert (IAA, Tuebingen), A. von Kienlin (MPE, Garching), S. Martinez-Nunez (Valencia), M. Mas-Hesse (LAEFF, Madrid), C. Sanchez (ESAC, Madrid), G. G.C. Palumbo (Bologna University), R. A. Sunyaev (IKI, Moscow & MPA, Garching) | Recent routine INTEGRAL Galactic Plane Scan (GPS) observations including the Vela region have shown that Vela X-1 has entered a highly active state, similar to the December 2003 flaring state (Staubert et al., 2004, Conf. Proc. 5th Integral Workshop). During the GPS observations on 2006 January 16 and 2006 January 22, ... | 2006-01-26 22:54:00 | optical,x-ray,gamma ray,binary,neutron star,pulsar,star,request for observations |
712 | Near-Infra-Red Observations of XTE J1701-462 using SMARTS | D. Maitra, C. Bailyn (Yale) | We have been observing the putative near-infra-red counterpart of the newly discovered X-ray transient XTE J1701-462 (ATEL #696, #702, #706, #710), in I, J, H and K-bands, using the SMARTS 1.3m telescope and ANDICAM instrument since Jan 21. As of Jan 26.36 UT, the magnitudes of the source were: I=20.3(2) J=16.8(1) H=15... | 2006-01-27 03:42:00 | infra-red,x-ray,binary,black hole,neutron star,star,transient |
713 | SWIFT J1626.6-5156 is not a high mass X-ray binary | N. Rea (SRON Utrecht), V. Testa, G. L. Israel, A. Antonelli (INAF-OAR), P. Jonker (SRON Utrecht, CfA), T. Belloni, S. Campana (INAF-OAB), L. Stella (INAF-OAR) | on behalf of E. Molinari, G. Chincarini, F.M. Zerbi, S. Covino, G. Tosti, P. Conconi, G. Cutispoto, L. Nicastro, E. Palazzi, F. Vitali, F. D'Alessio, E. Meurs, P. Goldoni and the REMIR/ROSS collaboration
We report on infrared observations of the newly discovered transient X-ray pulsar SWIFT J1626.6-5156 (Palmer et al.... | 2006-01-27 18:56:00 | infra-red,optical,x-ray,binary,pulsar,star,transient,request for observations |
714 | Bright New Black Hole Transient XTE J1817-330 | R. Remillard, A. M. Levine, E. H. Morgan (MIT), C. B. Markwardt (U. Maryland & NASA/GSFC), & J. H. Swank (NASA/GSFC) | We report a new source discovered by the RXTE ASM and follow-up observations with the RXTE PCA.
Observations with the RXTE All-Sky Monitor on 2006 Jan. 26 suggested the sudden appearance of a very bright X-ray source near ra=274.56, dec=-32.92 (degrees, J2000). The angular proximity to the sun limited the number of dw... | 2006-01-29 05:32:00 | x-ray,black hole,the sun,transient |
715 | The symbiotic star CD-57 3057 is the likely counterpart of IGR J10109-5746 | N. Masetti, L. Bassani (IASF/INAF, Bologna), A. J. Dean (Univ. Southampton), P. Ubertini (IASF/INAF, Rome) and R. Walter (ISDC, Versoix) | We report that, further to the discovery of the new INTEGRAL source IGR J10109-5746 belonging to the Crux Galactic arm survey (Revnivtsev et al. 2005, astro-ph/0508155) and of its likely soft X-ray counterpart SWIFT J1010.1-5747 (Tueller et al., ATel #669), a SIMBAD catalog search showed that the precise Swift/XRT sour... | 2006-01-31 01:26:00 | optical,x-ray,binary,cataclysmic variable,star,variables,a comment |
716 | Multiple Photometric Periods in SXP1323 (RX J0103.6-7201) | Paul C. Schmidtke and Anne P. Cowley (Arizona State University) | RX J0103.6-7201 (SXP1323) is a Be/neutron-star binary in the Small Magellanic Cloud with the longest known X-ray pulsation period (1323 s; Haberl & Pietsch 2005, A&A, 438, 211). The optical counterpart is #1393 from the emission-line catalogue of Meyssonnier & Azzopardi (1993, A&AS, 102, 451). Periodogram analysis of O... | 2006-01-31 02:49:00 | optical,x-ray,binary,neutron star,pulsar,star,variables |
717 | Possible Radio Counterpart to XTE J1817-330 | M. P. Rupen V. Dhawan, A. J. Mioduszewski (NRAO) | Very Large Array (VLA) observations of the black hole candidate binary XTE J1817-330 (ATel #714) on 31 January 2006 show one radio source within the 30-arcsec RXTE PCA error box, at a J2000 position of: 18h 17m 43.537s -33d 01' 07.8" As these data were taken shortly after an array reconfiguration, the astrometric uncer... | 2006-02-01 13:54:00 | radio,binary,black hole,transient |
718 | TT Ari: Recent Negative Superhumps and QPO's | J. N. Yoon (CBNU, Korea), I. L. Andronov (ONU, Ukraine), S. M.Cha (CBNU, Korea), | TT Ari has been recently discovered to be at a relatively unstable phase by Andronov, Gazeas & Niarchos (2005, VSNET-Campaign 1630). Its prolonged "positive superhump" state from 1997 to 2004 has changed. In October-November, 2005, the star was fainter, and the superhumps are not pronounced. The dominating type of vari... | 2006-02-02 06:11:00 | optical,cataclysmic variable,star,variables,request for observations |
719 | Optical identification of IGR J13091+1137 as a heavily obscured AGN | N. Masetti, E. Palazzi, A. Malizia (INAF-IASF, Bologna), A. J. Bird (Univ. Southampton), L. Norci (Dunsink Obs.), I. Bruni (INAF-Oss. Astron. Bologna), A. Bazzano and A. De Rosa (INAF/IASF, Rome) | In order to identify the nature of the active nucleus of spiral galaxy NGC 4992, associated with the Chandra and INTEGRAL high-energy sources CXOU J130905.6+113803 and IGR J13091+1137 (see Halpern, Atel #572 and Sazonov et al., 2005, A&A, 444, L37), we acquired a 15-minute optical spectrum on February 1, 2006 with the ... | 2006-02-03 22:42:00 | optical,x-ray,agn |
720 | Swift observations of Swift J0911.2+4533 | D. Grupe (PSU), J. Tueller (NASA/GSFC), C. Markwardt (U Md, NASA/GSFC), J. A. Kennea (PSU), A. Falcone (PSU), R. Mushotzky (NASA/GSFC), S. Barthelmy (NASA/GSFC), H. Krimm (NASA/GSFC), S. Campana (OAB), O. Godet (U Leicester), G. K. Skinner (CERS), K. Mukai (NASA/GSFC), S. T. Holland (NASA/GSFC), M. Ajello (MPE)... | We report on the X-ray detection in the 0.3-10 keV band of Swift J0911.2+4533. The source was detected in our ongoing Swift Burst Alert Telescope (BAT) hard X-ray survey (Tueller et al. ATEL #668 and #669, Kennea et al. ATEL #677, Ajello et al. ATEL #697). Swift J0911.2+4533 was observed on 2006-01-04 01:16 (UT start t... | 2006-02-04 00:02:00 | optical,ultra-violet,x-ray,agn |
721 | Confirmation of Radio Counterpart to XTE J1817-330 | M. P. Rupen V. Dhawan, A. J. Mioduszewski (NRAO) | Very Large Array (VLA) observations of the black hole candidate binary XTE J1817-330 (ATel #714) show that the suggested radio counterpart (ATel #717) has faded significantly (3.9sigma) at 4.86 GHz, from 0.83 +/- 0.12 mJy on Jan. 31 to 0.32 +/- 0.06 mJy on Feb. 2, and 0.35 +/- 0.05 mJy on Feb. 3. This variability stron... | 2006-02-04 05:21:00 | radio,x-ray,binary,black hole,transient |
722 | Radio Observations of SN 2005ke | Alicia Soderberg (Caltech) | I observed the peculiar SN 2005ke in NGC 1371 (IAUC 8630 , CBETs 291,387) with the Very Large Array on 2005 November 18.2 and 2006 January 27.1 UT. No radio emission is detected at the optical position at in either epoch at an observing frequency of 8.46 GHz. Further observations are planned. | 2006-02-06 02:01:00 | radio,optical,supernovae |
723 | Discovery of four SN candidates as a part of A Survey for Supernovae in Massive High-Redshift Clusters | K. Sharon (Tel Aviv University), Avishay Gal-Yam (Caltech) and D. Maoz (Tel Aviv University) | K. Sharon (Tel Aviv U.), A. Gal-Yam (Caltech), and D. Maoz (Tel Aviv U.) report for a larger collaboration, including M. Donahue (MSU), H. Ebeling (IfA), R. Ellis (Caltech), A. Filippenko (UCB), R. Foley (UCB), W. Freedman (OCIW), J.-P. Kneib (Marseille), R. Kirshner (CfA), T. Matheson (NOAO), J. Mulchaey (OCIW), M. Ph... | 2006-02-07 02:17:00 | optical,agn,supernovae,transient |
724 | Discovery of the NIR counterpart of XTE J1817-330 | P. D'Avanzo (INAF-OAB), P. Goldoni (CEA, Saclay), S. Covino (INAF-OAB), S. Campana (INAF-OAB), E. Molinari(INAF-OAB), G. Chincarini (Uni. Bicocca), F. M. Zerbi (INAF-OAB), V. Testa (INAF-OAR), G. Tosti (Uni. Perugia), F. Vitali (INAF-OAR), L. A. Antonelli (INAF-OAR), P. Conconi (INAF-OAB), G. Malaspina (INAF-OAB), ... | We report on optical and infrared observations of the black hole candidate XTE J1817-330 (ATel #714). The observations were performed in the K band with the REMIR Camera (field of view of 10'x10' and a pixel size of 1.22") and in the R band with the ROSS Camera (field of view of 10'x10' and a pixel size of 1.22"). Both... | 2006-02-07 22:29:00 | radio,infra-red,optical,binary,black hole,transient |
725 | Continuing RXTE observations of XTE J1701-462: a new "Z" in town? | Jeroen Homan (MIT), Tomaso Belloni (INAF/OAB), Michiel van der Klis, Piergiorgio Casella (U. Amsterdam), Mariano Mendez (SRON), Walter Lewin (MIT), Rob Fender (U. Southampton), Elena Gallo (UCSB), and Neil Gehrels (NASA/GSFC) | Since January 19 the new X-ray transient XTE J1701-462 (ATels #696, #703, #708, #710) has been observed more than 45 times with the Rossi X-ray Timing Explorer (RXTE). Preliminary analysis of the RXTE data suggest the source is a neutron star LMXB and is currently showing behavior typical of the so-called "Z sources" (... | 2006-02-08 20:50:00 | x-ray,binary,neutron star,star,transient |
726 | Swift Observations of Supernova 2006X in M100 | Stefan Immler (NASA/USRA/GSFC) | S. Immler, Goddard Space Flight Center, NASA and Universities Space Research Association, P. Brown, Pennsylvania State University, and Peter Milne, U. of Arizona, on behalf of the Swift-satellite team, report on Swift Ultraviolet/Optical Telescope (UVOT; wavelength range 170-650 nm) and X-Ray Telescope (XRT; 0.2-10 keV... | 2006-02-09 15:30:00 | optical,ultra-violet,x-ray,supernovae |
727 | A radio flare from Cyg X-3 | Tsuboi (NRO NAOJ), N. Kuno (NRO NAOJ), T. Umemoto (NRO NAOJ), T. Sawada (NRO NAOJ), K. Nakanishi (NRO NAOJ), T. Tosaki (NRO NAOJ), Y. Kurono (NRO NAOJ), K. Fujisawa (Yamaguchi-U), Japanese VLBI Network Team, S. Trushkin (SAO RAS), T. Kotani (Tokyo Tech), N. Kawai (Tokyo Tech) | We report that the microquasar Cyg X-3 is undergoing a significant radio flare and would request for followup observations at all frequencies. In the current multi-frequency monitoring observations with RATAN-600 radio telescope, the flux density at 4.8 GHz of the source was found to drop from 103 mJy on Jan 14.4 (UT) ... | 2006-02-09 18:40:00 | radio,millimeter,binary,black hole,request for observations |
728 | Radio Observations of Type Ia SN2006X | Alicia Soderberg (Caltech) | Alicia Soderberg (Caltech) reports: I observed the Type Ia supernova 2006X in NGC 4321 (IAUC 8667 , CBET 393) with the Very Large Array on 2006 February 9.34 UT (approximately 2 days after optical discovery). The 2.5 hour observation at 8.46 GHz reveals no radio source coincident with the optical SN position. I place a... | 2006-02-09 23:53:00 | radio,optical,supernovae |
729 | SUPERNOVA 2006X IN NGC 4321 (M100) | C. J. Stockdale and M. Kelley, Marquette University; R. A. Sramek, National Radio Astronomy Observatory; S. D. Van Dyk, Spitzer Science Center, California Institute of Technology; S. Immler, Goddard Space Flight Center and Universities Space Research Association; K. W. Weiler and C. L. M. Williams, Naval Research Labor... | We report the lack of detection of radio emission near the position of the type-Ia supernova 2006X (IAUC 8667 , CBET 393) with the Very Large Array: âUpper limits (3 sigma) to any radio flux density were established on 2006 Feb. 09.37 UT of <0.162 mJy (Spectral Luminosity < 5.6 x 10^25 erg/s/Hz) at 22.460 GHz (wavele... | 2006-02-10 00:26:00 | radio,optical,supernovae |
730 | SN 2006U is an AGN | The Nearby Supernova Factory: N. Blanc, Y. Copin, E. Gangler, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, S. Gilles, R. Pain, R. Pereira (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, S. Bongard, D. Kocevski, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter... | The Nearby Supernova Factory reports that a spectrum (range 320-1000 nm) of SN2006U (IAUC # 8667 ), obtained 2006 February 8.4 UT with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-meter telescope, shows it to be an AGN at redshift 0.25. The redshift was determined by matching H-alpha and H-... | 2006-02-10 08:57:00 | infra-red,optical,ultra-violet,agn,supernovae |
731 | INTEGRAL detects hard X-ray emission from XTE J1817-330 | S. E. Shaw (Southampton, UK/ ISDC, Geneva); J. Zurita (ISDC, Geneva); E. Kuulkers (ESA/ESAC, Spain); S. Brandt, J. Chenevez (DNSC, Denmark); T. J.-L. Courvoisier (ISDC, Geneva); K. Ebisawa (NASA/GSFC, USA); P. Kretschmar (ESA/ESAC, Spain); C. Markwardt (NASA/GSFC, USA); N. Mowlavi (ISDC, Geneva); T. Oosterbroek (ESA/ES... | During the start of the third period of the INTEGRAL Galactic Bulge monitoring observations (Kuulkers et al 2005, ATel #438), the X-ray transient and black-hole candidate XTE J1817-330 (ATel #714) has been detected in the 20 - 150 keV range. The observations comprised ~7 ksec taken on 9 Feb 2006 between 09:02 and 11:43... | 2006-02-10 18:38:00 | x-ray,gamma ray,black hole,transient,a comment |
732 | Discovery of SNF20060208-004 (Type II), Classification of SN 2006aa (Type IIn) and SN 2006ac (Premaximum Type Ia) | The Nearby Supernova Factory: N. Blanc, Y. Copin, E. Gangler, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, S. Gilles, R. Pain, R. Pereira (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, S. Bongard, D. Kocevski, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter... | The Nearby Supernova Factory reports the discovery of SNF20060208-004 (RA 09:07:43.11 Dec. +12:03:06.5 J2000.0) in images obtained February 8.3 UT with an approximate magnitude of 18.9 (calibrated to R) using the QUEST II camera on the Palomar Oschin 48-inch telescope as a part of the JPL Near-Earth Asteroid Tracking c... | 2006-02-11 08:46:00 | infra-red,optical,ultra-violet,asteroid,supernovae |
733 | The Optical Counterpart to XTE J1817-330. | M. A. P. Torres (CfA), D. Steeghs (CfA), P. G. Jonker (SRON/CfA), K. Luhman (Pennsylvania State Univ.), J. E. McClintock (CfA), M. R. Garcia (CfA) | We report the counterpart to the X-ray transient and black hole candidate XTE J1817-330 (ATEL #714).
Our observations consist of a series of 5s and 10s g'-band images obtained with the 6.5m Magellan Clay telescope during 2006 Feb 10 09:23-09:42 UT using the multi-object imaging spectrograph LDSS-3. The frames were acq... | 2006-02-11 09:57:00 | radio,optical,x-ray,binary,black hole,star,transient,request for observations |
734 | Three active neutron star X-ray transients: SAX J1747.0-2853, XTE J1739-285 and GRS 1747-312 | J. Chenevez (DNSC, Denmark), S. E. Shaw (Southampton, UK/ ISDC, Geneva), E. Kuulkers (ESA/ESAC, Spain), S. Brandt, (DNSC, Denmark), T. J.-L. Courvoisier (ISDC, Geneva), K. Ebisawa (NASA/GSFC, USA), P. Kretschmar (ESA/ESAC, Spain), C. Markwardt (NASA/GSFC, USA), N. Mowlavi (ISDC, Geneva), T. Oosterbroek (ESA/ESTEC, Neth... | Apart from the active black-hole candidate X-ray transient XTE J1817-330 (ATel #714), three known neutron star X-ray transients have been found to be active in the INTEGRAL Galactic Bulge monitoring observations on 9 Feb 2006 (ATel #731). These are SAX J1747.0-2853, XTE J1739-285 and GRS 1747-312. The former two were a... | 2006-02-11 19:59:00 | x-ray,binary,globular cluster,neutron star,star,the sun,transient,variables |
735 | Optical classification of 5 Swift hard X-ray sources | N. Masetti, L. Bassani (IASF/INAF, Bologna), A. J. Dean (Univ. Southampton), P. Ubertini (IASF/INAF, Rome) and R. Walter (ISDC, Versoix) | Between February 6 and 10, 2006, we used the instrument BFOSC mounted on the `G.D. Cassini' 1.5m telescope of the Astronomical Observatory of Bologna located in Loiano (Italy) to acquire optical spectra of the counterparts to 5 hard X-ray sources recently discovered by Swift (see ATels #669, #677 and #697) in order to ... | 2006-02-14 00:42:00 | radio,optical,x-ray,agn,binary,star |
736 | Supernova Discoveries: Type IIn SNF20060209-002 and Type Ia SNF20060209-003 | The Nearby Supernova Factory: N. Blanc, Y. Copin, E. Gangler, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, S. Gilles, R. Pain, R. Pereira (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, S. Bongard, D. Kocevski, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter... | The Nearby Supernova Factory reports the discovery and classification of two supernovae. Both were discovered in images obtained using the QUEST II camera on the Palomar Oschin 48-inch telescope as a part of the JPL Near-Earth Asteroid Tracking component of the Palomar Consortium. Spectra (range 320-1000 nm) of these o... | 2006-02-16 07:07:00 | infra-red,optical,ultra-violet,asteroid,supernovae |
737 | Strong Hard X-Ray Emission from RS Oph in Outburst | J. L. Sokoloski (SAO), K. Mukai (GSFC), G. J. M. Luna (SAO) | We report on the first X-ray observation of the recurrent nova RS Oph during the 2006 outburst. The Rossi X-ray Timing Explorer (RXTE) observed RS Oph for 1.5 ks on Feb 15, 2006, beginning at 21:43:00 UT. At that time, RS Oph was less than one week into the eruption. A preliminary analysis shows that it was detected ou... | 2006-02-17 01:52:00 | x-ray,binary,cataclysmic variable,nova,star,transient,variables |
738 | INTEGRAL and RXTE monitoring of XTE J1817-330: evolving through a state change? | E. Kuulkers (ESA/ESAC, Spain), P. Goldoni (APC & CEA, Saclay), S. E. Shaw (Southampton, UK/ ISDC, Geneva), S. Brandt, J. Chenevez (DNSC, Denmark), T. J.-L. Courvoisier (ISDC, Geneva), K. Ebisawa (NASA/GSFC, USA), P. Kretschmar (ESA/ESAC, Spain), C. Markwardt (NASA/GSFC, USA), N. Mowlavi (ISDC, Geneva), T. Oosterbroek, ... | INTEGRAL Galactic Bulge monitoring observations (ATel #438) indicate that the X-ray transient and black-hole candidate XTE J1817-330 (ATel #714) has increased in hard X-rays (20-60 keV) compared to the observations performed on Feb 9, 2006 (ATel #731). The 20-60 keV fluxes were 46+/-2 mCrab on Feb 11 and 79+/-2 mCrab o... | 2006-02-17 03:07:00 | x-ray,gamma ray,binary,black hole,transient,variables |
739 | Confirmation of counterpart to SWIFT J1626.6-5156 | Ignacio Negueruela, Amparo Marco (University of Alicante) | The candidate counterpart to SWIFT J1626.6-5156 (ATel #678, #679, #688) proposed by Rea et al. (ATel #713) was observed on the night of 2006 Feb 15 with the NTT (La Silla, Chile). The instrument used was EMMI with grism #6. This configuration covers the 570-870 nm range with a dispersion of 0.7A/pixel.
The candidate (... | 2006-02-17 05:02:00 | optical,x-ray,binary,pulsar,star,transient |
740 | Swift-UVOT detection of XTEJ1817-330 in the UV | D. Steeghs, M. A.P. Torres (CfA), J. Miller (UMich), P. G.Jonker (SRON/CfA) | The SWIFT Observatory performed a TOO observation of the active transient XTE J1817-330 (ATel #714) on Feb 18th 2006, covering 04:50-05:10UT. The Ultra-Violet/Optical Telescope (UVOT) collected a series of 160-190s exposures of the field surrounding the transient using its six broad-band filters.
Processed UVOT images... | 2006-02-20 05:14:00 | optical,ultra-violet,x-ray,binary,black hole,neutron star,star,transient |
741 | Second RXTE Observation of RS Oph in Outburst | J. L. Sokoloski, G. J. M. Luna (SAO), K. Mukai (GSFC) | We report on the second Rossi X-Ray Timing Explorer (RXTE) observation of the symbiotic recurrent nova RS Oph in outburst. This 2.3 ks observation was performed roughly one week into the eruption, on Feb 18, 2006, beginning at 17:27:00 UT. A preliminary analysis indicates that the source is still X-ray bright. We find ... | 2006-02-21 02:11:00 | x-ray,binary,cataclysmic variable,nova,star,transient,variables |
742 | INTEGRAL pointed observation of XTEJ1817-330 | P. Goldoni (APC & CEA, Saclay), E. Kuulkers (ESA/ESAC, Spain), J. Rodriguez (CEA, Saclay), S. E. Shaw (Southampton, UK/ ISDC Geneva), P. Dubath (ISDC Geneva), J. Chenevez, N. Lund (DNSC, Copenhagen), A. Goldwurm, M. Cadolle Bel (APC & CEA Saclay), M. Del Santo, P. Ubertini, A. Bazzano (INAF/IASF, Rome), C. Winkler (ESA... | We report preliminary results of the INTEGRAL ToO observation of the transient BHC XTEJ1817-330 (ATEL #714, #731) performed from 2006-02-15 01:28:29 (U.T.C.) to 2006-02-17 11:19:41.0 for a total exposure time of about 200 ksec. The source has been clearly detected up to 200 keV with no apparent cutoff at flux levels of... | 2006-02-22 01:05:00 | x-ray,gamma ray,binary,black hole,transient |
743 | A Pointed RXTE Observation of XTE J1817-330 | J. M. Miller (Michigan), J. Homan (MIT), D. Steeghs (CfA), M. A. P. Torres (CfA), R. Wijnands (Amsterdam) | We report on a pointed RXTE observation of XTE J1817-330, obtained on 2006-02-13 at 08:10:40 UT. After standard screening, the net good time for the PCA was 9.6 ksec, and the net good time for the HEXTE (cluster A) was 3.0 ksec. Joint fits were made to the PCU-2 and HEXTE-A spectra on the 2.8-25.0 keV and 20.0-200.0 ke... | 2006-02-22 01:26:00 | optical,ultra-violet,x-ray,binary,black hole,transient |
744 | Renewed X-ray activity of IGR J17419-2802 and GRS 1736-297 observed with INTEGRAL | S. A. Grebenev (IKI, Moscow), S. V. Molkov (IKI, Moscow), R. A. Sunyaev (IKI, Moscow; MPA, Garching) | Two X-ray transients, IGR J17419-2802 and GRS 1736-297, were found to be in outburst with the IBIS/ISGRI telescope on board INTEGRAL on February 19-20, 2006, during deep Open Program observations of the Galactic center field.
The first source, IGR J17419-2802, was detected with the signal-to-noise (S/N) ratio 12.2 and... | 2006-02-23 02:01:00 | radio,infra-red,optical,x-ray,black hole,neutron star,star,transient,request for observations |
745 | Refined X-ray position of IGR J17419-2802 | A. K.H. Kong (MIT) | We reanalyze the Swift XRT observation of IGR J17419-2802 taken on 2005 October 3 (ATel #617) and obtain a refined X-ray position of the source. The source is located at R.A. = 17h41m56.0s, Dec = -28:01:54.5 (J2000) with an estimated uncertainty of 3.6 arcsec (90% confidence radius). This position includes the latest X... | 2006-02-23 05:30:00 | x-ray,transient |
746 | Chandra Constraints on the Column Density to XTE J1817-330 | J. M. Miller (Michigan), J. Homan (MIT), D. Steeghs (CfA), R. Wijnands (Amsterdam) | We observed the black hole candidate with Chandra for 50 ksec, starting on Feb 13 2006 at 02:04 UT. The HETGS was used to obtain a high resolution spectrum, which was read-out with the ACIS-S array. Initial fits to the spectra have been made using XSPEC and ISIS. For a number of continuum models, and neutral absorption... | 2006-02-24 01:01:00 | optical,x-ray,binary,black hole,transient |
747 | Third RXTE Observation of RS Oph in Outburst: Beginning of the X-ray Decline | J. L. Sokoloski, G. J. M. Luna (SAO), K. Mukai (GSFC) | We report on the third Rossi X-Ray Timing Explorer (RXTE) observation of the symbiotic recurrent nova RS Oph in outburst. A preliminary analysis of this 1.56 ks observation, performed on Feb 22.60 UT (approximately 10 days after optical maximum), reveals that the source is continuing to soften in the X-rays, and that i... | 2006-02-24 10:24:00 | optical,x-ray,binary,cataclysmic variable,nova,star,transient,variables |
748 | Spectral evolution and kHz QPOs in the transient Z source XTE J1701-462 | Jeroen Homan (MIT), Tomaso Belloni (INAF/OAB), Michiel van der Klis, Piergiorgio Casella (U. Amsterdam), Mariano Mendez (SRON), Walter Lewin (MIT), Rob Fender (U. Southampton), Elena Gallo (UCSB), and Neil Gehrels (NASA/GSFC) | Since our last report on the transient Z source XTE J1701-462 (ATel #725), RXTE has continued observing the source on an almost daily basis. Spectral evolution similar to that reported by Homan et al. (ATel #725) is being observed, albeit at progressively lower luminosities, suggesting that the source has begun its dec... | 2006-02-25 04:59:00 | x-ray,binary,neutron star,star,transient |
749 | Optical Spectroscopy of XTE J1817-330 in Outburst | M. A.P. Torres, D. Steeghs, J. McClintock, M. Garcia (CfA), Alexis Brandeker, Duy Nguyen (Toronto), P. G.Jonker (SRON/CfA), J. M.Miller (Michigan) | A single 30 min high-resolution spectrum of the optical counterpart to the black hole candidate XTE J1817-330 (ATEL #714, #733) was acquired with the MIKE echelle spectrograph on the Magellan-Clay telescope at Las Campanas Observatory on Feb 20 2006 08:36 UT. In the blue (red), MIKE covered the wavelength range 3530-50... | 2006-02-26 06:50:00 | optical,binary,black hole,transient |
750 | Radio Observations of RS Oph: Past the First Peak? | G. G. Pooley (MRAO Cambridge), J. L. Sokoloski (CfA), M. P. Rupen, A. J. Mioduszewski (NRAO) | Radio observations of the symbiotic recurrent nova RS Oph made with the Ryle Telescope at Cambridge at 15.2 GHz give the following:
This is a low elevation source for the Ryle Telescope, and these flux densities are correspondingly uncertain, at about the 15% level. Still it seems clear that RS Oph has brightened cons... | 2006-02-27 23:50:00 | radio,binary,cataclysmic variable,nova,star,transient,variables |
751 | Chandra Observation of Supernova 2006X in M100 | S. Immler, NASA Goddard Space Flight Center, Universities Space Research Association | No X-ray source is detected at the position of the Type Ia SN 2006X in M100 (IAUC # 8667 , CBET #393, ATel #726) in a 37.9 ks Chandra ACIS-S X-ray observation from 2006-02-18.72UT. The 3-sigma upper limit to the (0.2-10 keV band) count rate is 4.5E-04 cts/s, corresponding to an unabsorbed X-ray flux and luminosity of 4... | 2006-02-28 04:26:00 | x-ray,supernovae,the sun |
752 | Rapid evolution of variability properties in XTE J1817-330 | Jeroen Homan (MIT), Jon M. Miller (Michigan), Rudy Wijnands (Amsterdam) | We observed the black hole candidate X-ray transient XTE J1817-330 five times with RXTE on February 24, between 06:03 UTC and 17:04 UTC. The unabsorbed 4-25 keV fluxes were close to 6.2e-10 ergs/cm^2/s in all five observations, only slightly higher than in our observation of February 13 (ATel #743). However, the 10-25 ... | 2006-02-28 22:33:00 | radio,x-ray,binary,black hole,transient |
753 | Swift/XRT detection of a transient source in the Galactic Center | J. A. Kennea (PSU), D. N. Burrows (PSU), S. Campana (OAB), O. Godet (U Leicester), J. Nousek (PSU) and N. Gehrels (GSFC) | We report the detection in late February 2006 of a variable X-ray source near Sgr A*, by the Swift X-Ray Telescope (XRT) in a series of short (~1ks per day) observations of the Galactic Center. We have analyzed data from four observations and detect a bright point source, Swift J174535.5-290135.6, 90 arcseconds from Sg... | 2006-03-01 02:59:00 | x-ray,transient,variables |
754 | Fourth RXTE Observation of RS Oph in Outburst: Continued Fading | J. L. Sokoloski, G. J. M. Luna (SAO), K. Mukai (GSFC) | We report on the fourth Rossi X-Ray Timing Explorer (RXTE) observation of the symbiotic recurrent nova RS Oph in outburst. A preliminary analysis of this 3.42 ks observation, performed on Feb 26.87 UT (approximately 14 days after optical maximum), reveals that the source is continuing to both soften and fade in the har... | 2006-03-01 06:19:00 | optical,x-ray,binary,cataclysmic variable,nova,star,transient,variables |
755 | No Radio Emission from IGR J17419-2802 or GRS 1736-297 | M. P. Rupen, A. J. Mioduszewski, V. Dhawan (NRAO) | Pursuant to the report of renewed X-ray activity in IGR J17419-2802 and GRS 1736-297 (ATel #744) on Feb. 19-20, both sources were observed with the Very Large Array (VLA) at 4.86 GHz on Feb. 26. In the case of IGR J17419-2802, there was no source within the revised Swift XRT error circle (ATel #745) with an rms of 95 m... | 2006-03-02 06:17:00 | radio,x-ray,black hole,neutron star,star,transient |
756 | INTEGRAL detects SWIFT J174535.5-290135.6 | J. Chenevez (DNSC, Denmark), C. Sanchez-Fernandez (ESA/ESAC, Spain), E. Kuulkers (ESA/ESAC, Spain), S. Shaw (Southampton, UK/ ISDC, Switzerland), S. Brandt (DNSC, Denmark), T. J.-L. Courvoisier (ISDC, Switzerland), K. Ebisawa (NASA/GSFC, USA), P. Kretschmar (ESA/ESAC, Spain), C. Markwardt (NASA/GSFC, USA), N. Mowlavi (... | We report on a detection of the new source SWIFT J174535.5-290135.6 (ATel #753) by the JEM-X monitor during INTEGRAL Galactic Bulge monitoring observations taken between 2006, 17 Feb 21:11 and 18 Feb 00:53 UTC (comprising ~10ks), i.e., a week earlier than the SWIFT detection. At that time the average JEM-X flux was 9 m... | 2006-03-03 06:38:00 | x-ray,binary,transient,variables |
757 | Periodic Optical Signal(s) from Swift J0732.5-1331 | J. Patterson, J. Halpern (Columbia U.), N. Mirabal (U. Michigan), Grant Christie (CBA-Auckland), Jennie McCormick (Farm Cove Observatory), Robert Rea (CBA-Nelson), David Messier (CBA-Connecticut) | On 2006 February 17, we obtained low-resolution spectra on the MDM 2.4m telescope of the proposed optical counterpart of the hard X-ray source Swift J0732.5-1331 (Ajello et al., ATel #697). The optical position is 07h 32m 37.64s, -13° 31' 09.0" (J2000.0). The spectrum looks essentially like that of a normal G star, ex... | 2006-03-03 08:37:00 | optical,x-ray,binary,cataclysmic variable,star,variables |
758 | Radio imaging campaign on newly-detected jets in GRS1915+105 | J. C.A. Miller-Jones (Univ. of Amsterdam), M. P. Rupen (NRAO), S. A. Trushkin (SAO RAS), G. G. Pooley (MRAO), R. P. Fender (Univ. of Southampton) | We report the detection of a large-scale radio jet in the black hole X-ray binary GRS 1915+105 following an X-ray and radio outburst, and announce the start of an intensive radio imaging campaign.
Daily observations with the RATAN-600 radio telescope showed a major radio flare in GRS 1915+105, peaking at ~350 mJy at 2... | 2006-03-03 20:56:00 | radio,x-ray,binary,black hole,transient,variables |
759 | Classification of SNe 2006aq, 2006ar, and SNF20060224-026 | The Nearby Supernova Factory: N. Blanc, Y. Copin, E. Gangler, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, S. Gilles, R. Pain, R. Pereira (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, S. Bongard, D. Kocevski, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter... | The Nearby Supernova Factory reports that spectra (range 320-1000 nm) of supernovae 2006aq (in MCG +07-24-32, CBET 419) and 2006ar (in MCG +11-13-36, CBET 420), obtained March 07.6 and 07.5 UT (respectively) with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-meter telescope, show that SN 200... | 2006-03-08 14:13:00 | infra-red,optical,ultra-violet,asteroid,supernovae |
760 | Optical identification of Swift J0732.5-1331 | T. Marsh (Warwick), S. Littlefair (Sheffield), V. Dhillon (Sheffield) | On 7 March 2006 we looked at the proposed optical counterpart of the hard X-ray source Swift J0732.5-1331 (Atel #697, #735, #757) using the high-speed multi-band CCD camera ULTRACAM mounted on the 4.2m William Herschel Telescope. This star is a suspected intermediate polar. We detected the pulsations previously reporte... | 2006-03-09 03:38:00 | optical,x-ray,cataclysmic variable,star,variables |
761 | SWIFT observation of SN 2006at | P. J. Brown, Pennsylvania State University, and S. Immler, Goddard Space Flight Center, NASA, and Universities Space Research Association, on behalf of the Swift-satellite team | We report on Swift Ultraviolet/Optical Telescope (UVOT) and X-Ray Telescope (XRT) observations of SN 2006at (Dintinjana & Mikuz 2006 CBET #434) obtained on 2006-3-10.63 UT.
UVOT magnitudes are V = 17.5 ± 0.2, B = 18.0 ± 0.3, U = 16.7 ± 0.2, UVW1 [181-321 nm] = 17.1 ± 0.2, UVM2 [166-268 nm] = 17.6 ± 0.2, and UVW2 ... | 2006-03-11 14:31:00 | optical,ultra-violet,x-ray,supernovae |
762 | Classification of SN 2006au, a Type II Supernova | The Nearby Supernova Factory: N. Blanc, Y. Copin, E. Gangler, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, S. Gilles, R. Pain, R. Pereira (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, S. Bongard, D. Kocevski, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo... | The Nearby Supernova Factory reports that a spectrum (range 320-1000 nm) of SN 2006au (CBET #426) obtained under bad seeing conditions on March 13.6 UT with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-meter telescope, shows it to be a Type II supernova at an approximate redshift of z = 0.0... | 2006-03-13 03:07:00 | infra-red,optical,ultra-violet,supernovae |
763 | Optical Spectroscopy of Swift J0732.5-1331 | M. A. P. Torres, D. Steeghs, M. R. Garcia, J. E. McClintock, P. Berlind, P. Zhao, M. Calkins (CfA), P. G. Jonker (SRON/CfA), P. J. Callanan (UCC), T. Marsh, B. T. Gaensicke (Warwick), P. Rodriguez-Gil (IAC), S. Littlefair, V. Dhillon (Sheffield) | In response to the detection of the X-ray source Swift J0732.5-1331 (ATEL #697, #735, #757, #760), we observed its optical counterpart with the Mt. Hopkins 1.5m telescope equipped with the FAST spectrograph. A total of 22 spectra covering 3480-7410 A were acquired between Jan 22 and Mar 1. A 3" slit provided 6 A FWHM r... | 2006-03-14 03:28:00 | optical,x-ray,binary,cataclysmic variable,star,variables |
764 | The decline and rise of the X-ray flux of RS Oph | J Osborne, K Page, A Beardmore (Leicester), M Bode (Liverpool John Moores), T O'Brien (Manchester), G Schwarz (West Chester), S Starrfield, J-U Ness (Arizona State), J Krautter (Heidelberg), J Drake (SAO), A Evans (Keele), S P S Eyres (Central Lancashire) | Swift observations of the current nova outburst of RS Oph have continued. After the two observations reported in IAUC # 8675 , there have been ~1 ksec observations on the following dates: Feb 21.01, 23.82, 26.43, 28.44, Mar 03.00, 10.82, 13.83.
Between Feb 21.01 and Mar 10.82 the count rate in the 0.3-10 keV band has ... | 2006-03-15 01:03:00 | x-ray,nova |
765 | Periodic X-ray modulation in Swift J0732.5-1331 | P. J. Wheatley, T. R. Marsh (Warwick), W. Clarkson (STScI) | We report the results of a Swift timing analysis of the probable new intermediate polar Swift J0732.5-1331 (ATEL #697, #735, #757, #760, and #763). This object was detected as a hard X-ray source with Swift (ATEL #697) and found to have the optical spectrum of a magnetic cataclysmic variable (ATEL #735, #763). A fast o... | 2006-03-15 02:31:00 | optical,ultra-violet,x-ray,binary,cataclysmic variable,variables |
766 | Outburst of IGR J11215-5952 Observed with RXTE | David. M. Smith and Nathan Bezayiff (U. C. Santa Cruz), Ignacio Negueruela (U. Alicante) | Sidoli et al. (2006, astro-ph/0203081) reported that the hard x-ray transient IGR J11215-5952 appeared to have a recurrence period of ~330 days, based on three short outbursts observed by INTEGRAL, the most recent of which was actually the discovery observation (Lubinski et al., ATEL #469). This short outburst, and the... | 2006-03-18 11:57:00 | x-ray,binary,pulsar,transient,request for observations |
767 | Orbital Period of Swift J0732.5-1331 | J. R. Thorstensen (Dartmouth), J. Patterson, J. Halpern (Columbia U.), N. Mirabal (U. Michigan) | On the nights of 2006 March 17, 18, and 19 UT we obtained time-series spectroscopy of the optical counterpart of this hard X-ray source (Ajello et al., ATEL #697), using the Hiltner 2.4m telescope at MDM Observatory and the Modular Spectrograph, covering from 4300 to 7500 Angstroms at 3.6 A resolution. The slit was ori... | 2006-03-19 21:58:00 | optical,x-ray,binary,cataclysmic variable,star,variables |
768 | Swift XRT confirmation of HD 306414 as the counterpart to IGR J11215-5952 | D. Steeghs, M. A.P. Torres (CfA), P. G.Jonker (CfA/SRON) | Following the report of renewed activity in the hard X-ray transient IGR J11215-5952 (ATEL #469, #766), we have obtained a Swift TOO observation of the field covering this X-ray source.
An X-ray Telescope (XRT) observation was obtained during 2006 March 20 18:50-19:02UT in Photon Counting mode with 640s on source. A s... | 2006-03-21 23:33:00 | x-ray,binary,neutron star,star,transient |
769 | Hard X-ray brightening of Ginga 1843+009 seen by Swift/BAT | H. Krimm (GFSC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC),J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), J. Tueller (GSFC) | As part of its hard X-ray transient monitor program, the Burst Alert Telescope on Swift has detected a brightening of the transient X-ray pulsar Ginga 1843+009. The source first became detectable on March 4, 2006, rising to a peak daily average brightness of 0.011 +/- 0.002 counts/s/cm^2, corresponding to ~50 mCrab in ... | 2006-03-22 06:21:00 | x-ray,pulsar,transient |
770 | RS Oph: Swift X-ray observations find short period modulation and highly variable low energy flux | J Osborne, K Page, A Beardmore M Goad (Leicester), M Bode (Liverpool John Moores), T O'Brien (Manchester), G Schwarz (West Chester), S Starrfield, J-U Ness (Arizona State), J Krautter (Heidelberg), J Drake (SAO), A Evans (Keele), S P S Eyres (Central Lancashire) | Swift X-ray telescope observations following the recent explosion of the recurrent nova RS Oph over 2006 Mar 17.65 - Mar 19.02 UT have shown a much increased count rate compared to the days before, and have revealed two new forms of modulation.
The Swift XRT 0.3-10 keV light curve can be characterised as a high level ... | 2006-03-23 01:49:00 | x-ray,nova,star,variables |
771 | Type determination for SN 2006at | A. Gal-Yam (Caltech), A. Cucchiara (Penn State) and P. Capak (Caltech) | A. Gal-Yam, A. Cucchiara and P. Capak report for the CCCP: We have observed SN 2006at (Dintinjana and Mikuz; IAUC # 8687) with the DBSP spectrograph mounted on the Hale 200" telescope at Palomar Observatory on 2006 March 17 UT, under generally poor conditions. Reduction of the spectrum shows Balmer lines superposed on ... | 2006-03-24 14:46:00 | optical,supernovae |
772 | Type determination for SN 2006aw | Schuyler D. Van Dyk (Spitzer Science Center/Caltech), Lucy J. Hadfield (Spitzer Science Center/Caltech and Univ. of Sheffield) | S.D. Van Dyk and L.J. Hadfield report: We have observed SN 2006aw (Monard; CBET 434) with the RC Spectrograph on the CTIO Blanco 4-m telescope on 2006 Mar 24.00 UT under very good conditions. Comparing with the spectrum of SN 1990U on day 12 in Matheson et al. (2001, AJ, 121, 1648), from a preliminary reduction of the ... | 2006-03-25 01:44:00 | optical,nova,supernovae |
773 | End of outburst of IGR J11215-5952; possible pulsations | David M. Smith, Nathan Bezayiff (U. C. Santa Cruz), and Ignacio Negueruela (U. Alicante) | The recent outburst of IGR J11215-5952, predicted by the ephemeris of Sidoli et al. (2006, astro-ph/0603081) and observed with the Rossi X-ray Timing Explorer (RXTE) (Smith, Bezayiff and Negueruela 2006, ATEL #766) has apparently ended. The first and last observations that showed significant activity began and ended on... | 2006-03-25 03:58:00 | x-ray,binary,pulsar,transient,variables |
774 | SGR 1900+14: Swift-BAT detection of renewed activity of a Soft Gamma Repeater | D. M. Palmer (LANL), C. B. Markwardt (GSFC/UMD), and S. D. Barthelmy (GSFC) | As reported in GCN #4922 (Vetere et al.): At 20:16:40 on 25 Mar 2006 UT, the Swift Burst Alert Telescope (BAT) triggered and located a burst from SGR 1900+14 (trigger=202746). The BAT on-board calculated location is RA,Dec 286.828, +9.270 {19h 07m 19s, +09d 16' 11"} (J2000) with an uncertainty of 3 arcmin (radius, 90% ... | 2006-03-26 05:14:00 | gamma ray,soft gamma-ray repeater |
775 | Identification of the X-ray transient Swift J061223.0+701243.9 | D. Grupe (PSU), J. P. Osborne (U Leicester), K. L. Page (U Leicester), D. N. Burrows (PSU), J. A. Nousek (PSU), and D. P. Schneider (PSU) | We report on the optical identification of the X-ray transient Swift J061223.0+701243.9 (Grupe et al., 2006, GCN #4672, GCN #4681) which is an uncatalogued object discovered serendipitously by the Swift X-ray Telescope (XRT) while observing the Swift Burst Alert Telescope (BAT) trigger 180274 (Grupe et al. 2006, GCN #4... | 2006-03-28 00:13:00 | optical,ultra-violet,x-ray,binary,cataclysmic variable,transient,variables |
776 | SWIFT observation of SN 2006bc | S. Immler, Goddard Space Flight Center, NASA, and Universities Space Research Association, and P. J. Brown, Pennsylvania State University, on behalf of the Swift-satellite team | We report on Swift Ultraviolet/Optical Telescope (UVOT) observations of SN 2006bc (Martin CBET #446) obtained on 2006-03-27.93 UT.
A new object is detected at R.A. = 7h21m16s.50, Decl. = -68o59'57".3 (equinox 2000.0) when compared to DSS images, consistent with the position reported by Martin (CBET #446). UVOT magnitu... | 2006-03-28 14:49:00 | optical,ultra-violet,supernovae |
777 | Chandra Localization of the Neutron Star X-Ray Transients XTE J1739-285 and XTE J1701-462 | Miriam I. Krauss (MIT), Adrienne M. Juett (U. Virginia), Deepto Chakrabarty (MIT), Peter G. Jonker (CfA/SRON), and Craig B. Markwardt (GSFC/U. Maryland) | We observed the neutron star soft X-ray transients XTE J1701-362 and XTE J1739-285 on 2006 March 27 with the Chandra X-Ray Observatory's High-Resolution Camera (HRC-S) in timing mode, as part of an existing program for the precise localization of neutron star/soft X-ray transients.
The transient Z source XTE J1701-462... | 2006-03-29 05:39:00 | radio,optical,x-ray,binary,neutron star,star,transient |
778 | Detection of Type I X-ray burst from IGR J17254-3257 | S. Brandt, C. Budtz-Jørgensen, J. Chenevez (Danish National Space Center) | A type I X-ray burst from IGR J17254-3257 (1RXS J172525.5-325717) has been found in archival data from INTEGRAL. The burst occurred on Feb 17, 2004 at 19:44:00 (UTC) and was detected by the JEM-X X-ray monitor. The burst had a rise time <5s and an e-folding decay time of 15 sec. The burst reached a peak flux of 0.8 Cra... | 2006-03-29 17:54:00 | x-ray,neutron star,star |
779 | Swift/BAT and RXTE/ASM Discovery of the Orbital Period of IGR J16418-4532 | R. Corbet (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC), on behalf of the Swift-Survey t... | The Swift Burst Alert Telescope (BAT) light curve of IGR J16418-4532 (Tomsick et al. 2004 ATEL #224) obtained between 2004 Dec 21 and 2005 Sep 17 shows modulation at a period near 3.75 days. This period is confirmed and refined by observations made with the Rossi X-ray Timing Explorer All-Sky Monitor (ASM) between 1996... | 2006-03-30 01:44:00 | x-ray,gamma ray,binary,neutron star,pulsar,star |
780 | XTE J1709-462: Swift/XRT refined position | J. A. Kennea (PSU), O. Godet (U Leicester) and D. N. Burrows (PSU) on behalf of the Swift/XRT team: | In response to the work of Krauss et al. (ATEL #777), we have performed a refined analysis of the Swift/XRT data on XTE J1701-462. We find a refined XRT position for XTE J1709-462 of R.A. = 17:00:58.3, dec. = -46:11:09.0, with a 6.1 arcsecond error radius (90% containment). This refined position lies 1.7 arcseconds fro... | 2006-03-30 04:44:00 | x-ray,transient |
781 | Correction: XTE J1701-462: Swift/XRT refined position | J. A. Kennea (PSU), O. Godet (U Leicester) and D. N. Burrows (PSU) on behalf of the Swift/XRT team: | Correction: Incorrect source name was given in ATEL #780, we apologize for this error. In response to the work of Krauss et al. (ATEL #777), we have performed a refined analysis of the Swift/XRT data on XTE J1701-462. We find a refined XRT position for XTE J1701-462 of R.A. = 17:00:58.3, dec. = -46:11:09.0, with a 6.1 ... | 2006-03-30 04:51:00 | x-ray,transient |
782 | RTT150 high resolution spectral observations of Solar Corona during the solar eclipse on March 29, 2006 | I. F.Bikmaev, N. A.Sakhibullin, A. I.Galeev (Kazan State University and Academy of Sciences of Tatarstan, Russia), I. M.Khamitov, Z. Aslan (TUBITAK National Observatory, Turkey), R. A.Sunyaev (MPA, Garching, IKI, Moscow) | On March 29, 2006, the total solar eclipse had a duration of totality of about 2 minutes at TUBITAK National Observatory, Antalya, Turkey. The Russian-Turkish 1.5-meter optical telescope (RTT150) equipped with a coude-echelle spectrometer and a 1040 x 1160 pixels nitrogen cooled CCD was used to get the spectra of solar... | 2006-03-30 20:38:00 | optical,the sun |
783 | Optical classification of 8 INTEGRAL sources | N. Masetti (INAF/IASF, Bologna), L. Morelli (PUC, Santiago), E. Palazzi, J. Stephen (INAF/IASF, Bologna), A. Bazzano (INAF/IASF, Rome), A. J. Dean (Univ. Southampton), R. Walter (ISDC, Versoix) and D. Minniti (PUC, Santiago) | On 20-22 March 2006 we used the R-C spectrograph of the CTIO 1.5m telescope in Cerro Tololo (Chile) to get optical spectra of the putative counterparts of 8 X-ray sources discovered by INTEGRAL (see Bird et al. 2006, ApJ, 636, 765; Halpern 2005, ATel #572; Kuiper et al. 2006, ATel #684; Sazonov et al. 2005, A&A, 444, L... | 2006-03-31 05:06:00 | optical,x-ray,binary,cataclysmic variable,star,variables |
784 | Optical and NIR observations of XTE J1739-285 | M. A. P. Torres, D. Steeghs, M. R. Garcia, J. E. McClintock (CfA), P. G. Jonker (SRON/CfA), D. Kaplan (MIT), J. Casares (IAC), R. Greimel (ING), T. Augusteijn (NOT) | We report optical and near-infrared (NIR) observations of the field containing the neutron star X-ray transient XTE J1739-285 (IAUC # 7300 , ATel #622). The recently reported Chandra localization (ATel #777) provides a significant improvement over the Swift XRT position reported in ATel #602, facilitating the identific... | 2006-03-31 05:13:00 | infra-red,optical,x-ray,binary,neutron star,star,transient,variables |
785 | Optical classification of 3 Swift southern hard X-ray sources | L. Morelli (PUC, Santiago), N. Masetti, L. Bassani, R. Landi, A. Malizia (INAF-IASF, Bologna), A. J. Bird (Univ. Southampton), P. Ubertini (INAF-IASF, Rome) and G. Galaz (PUC, Santiago) | In order to identify the nature of 3 hard X-ray sources recently discovered by Swift (see ATels #669 and #677), we acquired optical spectra of their counterparts at the 1.5m telescope of the Cerro Tololo Interamerican Observatory (Chile) using the R-C spectrograph on the nights of March 21 and 22, 2006. Total exposure ... | 2006-03-31 05:14:00 | optical,x-ray,agn |
786 | Orbital Parameters for the X-Ray Pulsar IGR J16393-4643 | Tommy Thompson, John A. Tomsick, Richard Rothschild (CASS/UCSD), Jean in 't Zand (SRON), and Roland Walter (ISDC) | With recent and archival Rossi X-ray Timing Explorer (RXTE) X-ray measurements of the heavily obscured X-ray pulsar IGR J16393-4643, we carried out a pulse timing analysis to determine the orbital parameters. Assuming circular orbits, we phase-connected data spanning over 1.5 years. The most likely orbital solution has... | 2006-04-01 01:35:00 | x-ray,binary,neutron star,pulsar,star |
787 | Optical Outbursts from SDSS J113551.09+532246.2 and SDSS J120231+450349 | R. Quimby and P. Mondol (U. Texas) | We report the discoveries of two optical transients found in unfiltered CCD images taken by the 0.45m ROTSE-IIIb telescope at the McDonald Observatory. The first object was detected on 2006 March 24.40 UT (about 15.1 mag) at RA = 11h35m51.12s, DEC = +53o22'46.1" (J2000; uncertainty +/- 0.5"). This position matches the ... | 2006-04-01 06:51:00 | optical,cataclysmic variable,nova,transient,variables |
788 | Swift XRT detection of the Integral ISGRI source IGR J2018+4043. | J. Kennea, G. G. Pavlov (PSU), A. M. Bykov, A. M. Krassilchtchikov, Yu. A. Uvarov (Ioffe Inst.), F. Lebrun (CEA-Saclay), H. Bloemen, W. Hermsen, J. Kaastra (SRON) | We observed the field around the hard X-ray source IGR J2018+4043 (Bykov et al. 2004, A&A, 427, L21) with Swift (total exposure 5 ks) and detected a point-like source in the XRT image at R.A. = 20:18:38.5, decl. = +40:41:00.4 (uncertainty 4.2 arcsec radius at 90% confidence level), consistent with the ISGRI position an... | 2006-04-04 04:41:00 | infra-red,x-ray,gamma ray,agn,binary |
789 | Swift-BAT observations of SGR 1900+14 | D. M. Palmer (LANL), T. Sakamoto (GSFC/ORAU), S. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), N. Gehrels (GSFC), H. Krimm (GSFC/USRA),C. Markwardt (GSFC/UMD), J. Tueller (GSFC) | The recent re-activation of the Soft Gamma-ray Repeater SGR 1900+14 (Vetere et al. GCN# 4922) has been intensively observed by the Swift Burst Alert Telescope (BAT) as well as by the Swift UVOT and XRT instruments. Here we report on the BAT results.
The first detection by BAT was at 2006-03-25 10:12:04 UTC, and marked... | 2006-04-04 06:24:00 | gamma ray,soft gamma-ray repeater |
790 | INTEGRAL discovery of two faint hard X-ray sources in the Galactic Bulge | M. Turler (ISDC, Geneva), S. E. Shaw (Southampton, UK/ ISDC, Geneva), E. Kuulkers (ESA/ESAC, Spain), S. Brandt, (DNSC, Denmark), T. J.-L. Courvoisier (ISDC, Geneva), A. Domingo Garau (LAEFF/INTA, Spain), K. Ebisawa (NASA/GSFC, USA), P. Kretschmar (ESA/ESAC, Spain), C. Markwardt (NASA/GSFC, USA), N. Mowlavi (ISDC, Genev... | Analysis of INTEGRAL Galactic Bulge monitoring observations (ATel #438) taken between 16:51 and 20:33 UTC on 3 April 2006, reveals the presence of two new sources of hard X-rays. They both have a detection significance exceeding 6 sigma in the IBIS/ISGRI 20-60 keV band with a corresponding flux of ~10 mCrab. The two so... | 2006-04-06 23:32:00 | x-ray,transient |
791 | XMM-Newton observation of XTE J1817-300 | G. Sala, J. Greiner (MPE Garching) | The black hole candidate XTE J1817-300 was observed for 20 ks with XMM-Newton on 13 March 2006, 45 days after the X-ray maximum as seen with RXTE/ASM. The EPIC-pn camera was used in the Burst mode and a simultaneous high resolution spectra was obtained by RGS1. Spectral fits have been performed using XSPEC. The EPIC-pn... | 2006-04-07 23:33:00 | x-ray,black hole,transient |
792 | Optical observations of Nova V2362 Cyg | K. Czart, M. Lewandowski, G. Maciejewski, T. Tomov, M. Mikolajewski, A. Niedzielski (Torun Centre for Astronomy, Torun, Poland) | We report on optical spectral observations and V brightness estimate obtained with 60/90 cm Schmidt-Cassegrain telescope and the SAVS camera of the Nicolaus Copernicus University Observatory in Piwnice.
The spectrum obtained on April 6.05 UT (3400-7050AA, resolution of 4A) shows numerous absorption lines (HI, FeII, Ca... | 2006-04-10 13:21:00 | optical,cataclysmic variable,nova,star,variables |
793 | Swift Observations of SN 2006bp in NGC 3953 | S. Immler, Goddard Space Flight Center, NASA, and Universities Space Research Association; P. J. Brown, Pennsylvania State University, and P. Milne (Steward Observatory, University of Arizona) on behalf of the Swift-satellite team | We report on Swift Ultraviolet/Optical Telescope (UVOT) and X-Ray Telescope (XRT) observations of SN 2006bp (cf. CBET #470) obtained on Apr. 10.54 UT.
We confirm the detection of a new object at R.A. = 11h53m55s.70, Decl. = +52o21'10".4 (equinox 2000.0) as compared to Digitized Sky Survey images, consistent with the p... | 2006-04-11 04:30:00 | optical,x-ray,supernovae |
794 | SGR-like Burst from Direction of AXP 4U 0142+61 | Victoria Kaspi, Rim Dib (McGill University), Fotis Gavriil (NASA/GSFC) | On MJD 53831.3 (April 6, 2006) during regular RXTE/PCA monitoring of AXP 4U 0142+61, we detected a single small SGR-like burst. The burst is similar to the smallest burst seen from AXP 1E 1048-5937, lasting approximately 1.8 s and having total fluence approximately 100 counts in the 2-20 keV band, with 3 operational PC... | 2006-04-14 18:39:00 | far-infra-red,infra-red,optical,x-ray,gamma ray,neutron star,pulsar,soft gamma-ray repeater,star,transient,request for observations |
795 | The progenitor of Nova Cygni 2006 (=V2362 Cyg) | D. Steeghs (CfA), R. Greimel (ING), J. Drew (Imperial College London), M. Irwin (IoA), B. Gaensicke (Warwick), P. Groot (Nijmegen), C. Knigge (Southampton) and the IPHAS collaboration | We report on the detection of the likely progenitor to Nova Cygni 2006 = V2362 Cyg (IAUC # 8697 , # 8698 , ATel #792) using images from the INT Photometric H-Alpha Survey (IPHAS; http://www.iphas.org ).
The field containing the classical nova was observed as part of our galactic plane survey on Aug. 3rd 2004 between 0... | 2006-04-15 08:54:00 | optical,binary,cataclysmic variable,nova,star,transient,variables |
796 | INTEGRAL detection of a strong outburst in 4U 1954+31 | S. Paltani (ISDC, Geneva), D. Attie (CEA, Saclay), A. Domingo Garau (LAEFF, Madrid), S. Larsson (Stockholm Observatory), J. Paul (CEA, Saclay), P. Shtykovsky (SRI, Moscow), A. Strong (MPI, Garching), O. R.Williams (ISOC/ESAC, Madrid) | We report the dectection of a ~150 mCrab outburst in the transient high mass X-ray binary 4U 1954+31, observed in the Galactic Plane Survey (GPS) by INTEGRAL. The flux in the IBIS/ISGRI instrument reached 17.7 counts/s (165 mCrab, 32-sigma detection) in the 20-40 keV band. The observations started at 00:14 UTC on Apr 1... | 2006-04-16 20:17:00 | x-ray,gamma ray,binary,transient |
797 | Swift/BAT Detection of a 5 hour Period in 4U 1954+31 | R. Corbet (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC), on behalf of the Swift-Survey t... | The power spectrum of the Swift Burst Alert Telescope (BAT) light curve of 4U 1954+31 obtained between 2004 December 11 and 2005 September 20 shows, in addition to low frequency noise, modulation at a period of approximately 5.09 hours. The peak in the power spectrum near 5 hours shows a complex structure. When the lig... | 2006-04-21 00:27:00 | optical,x-ray,binary,neutron star,pulsar,star,transient,variables |
798 | Discovery of radio emission from X-ray pulsar XDINS 1RXS J214303.7+065419+06 | V. M.Malofeev (PRAO LPI, Pushchino), O. I. Malov (PRAO LPI, Pushchino), D. A. Teplykh (PRAO LPI, Pushchino), S. V. Logvinenko(PRAO LPI, Pushchino), I. I. Litvinov (PRAO LPI, Pushchino), S. B. Popov (SAI MSU, Moscow) | We report the detection of radio pulses from X-ray pulsar 1RXS J214303.7+065419 at the frequency 111.23 MHz. The pulsed X-ray emission with the spin period 9.437 s was discovered in March 2005 by Zane et al. (astro-ph/0503239) towards the dim isolated neutron star (XDINS) RBS 1774 using XMM-Newton observations. Our obs... | 2006-04-21 15:46:00 | radio,x-ray,neutron star,pulsar,star |
799 | Swift/BAT detection of a new X-ray source, SWIFT J1656.3-3302, in the Galactic Center region | T. Okajima (JHU/NASA/GSFC), J. Tueller (NASA/GSFC), C. Markwardt (UMD/NASA/GSFC), M. Ajello (MPE Garching), V. Beckmann (UMBC/NASA/GSFC), T. Belloni (INAF/OAB), A. Falcone (PSU), O. Godet (U Leicester) , D. Grupe (PSU), S. Holland (USRA/NASA/GSFC), J. Kennea (PSU), K. Mukai (USRA/NASA/GSFC), R. Mushotzky (NASA/GSFC), R... | We report the detection of unidentified source SWIFT J1656.3-3302, which is located at RA = 254.08, Dec = -33.03 (J2000), galactic coordinates l = 350.60, b = 6.36. The source was detected at 5.7 sigma significance during the Swift/BAT hard X-ray survey (mid Dec. 2004 to mid Sept. 2005). The BAT spectrum (14-200 keV) i... | 2006-04-28 04:41:00 | x-ray,transient,request for observations |
800 | IGR J19140+0951 simultaneously observed with INTEGRAL, Swift and RXTE | J. Rodriguez (CEA/AIM Saclay, France), V. Beckmann (NASA/GSFC/UMBC, USA), D. C Hannikainen (Obs. of Helsinki, Finland), F. Lebrun (CEA/APC, France), S. E. Shaw (Univ. of Southampton, UK), D. Willis (MPE Garching, Germany) | The INTEGRAL source IGR J19140+0951 (Hannikainen et al. 2004, A&A, 423, L17) has been simultaneously targeted with INTEGRAL, Swift, and RXTE on April 26-27 2006, for 21, ~7, and ~7 ks respectively. | 2006-04-28 22:19:00 | x-ray,gamma ray,black hole,neutron star,pulsar,star,transient |
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