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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201 | IGR J16316-4028 a possible X-ray counterpart to 3EG J1631-4033 discovered by INTEGRAL | Jerome Rodriguez (CEA Saclay & ISDC) & Andrea Goldwurm (CEA Saclay) | We report the detection of a source, IGR J16316-4028, at RA=16h31.6m Dec=-40°28' (+-3 arcmin) with the IBIS/ISGRI telescope on board INTEGRAL. The source was detected during a ToO observation of the Galactic black hole candidate XTE J1720-318 performed on Feb. 28 2003. The source is detected at the 9 sigma level in th... | 2003-10-24 16:12:00 | x-ray,gamma ray,agn,black hole,neutron star,pulsar,quasar,star |
202 | Be star counterpart of X-ray pulsar MX0656-072 | Manfred W. Pakull (Strasbourg), Christian Motch (Strasbourg) and Ignacio Negueruela (Alicante) | The field of the pulsating transient X-ray source MX0656-072 (ATEL #197,#199) has been observed with the ROSAT PSPC in 1993 September to reveal only a close pair of sources just outside the 3' error region. One, RX J065815.0-071237, coincides with the star GSC2.2 S100221215. An optical spectrum reveals an early-K star ... | 2003-10-24 20:29:00 | optical,x-ray,binary,neutron star,pulsar,star,transient,variables |
203 | The likely IR counterpart to the Anomalous X-ray Pulsar XTE J1810-197 | GianLuca Israel, Nanda Rea, Vincenzo Testa, Vanessa Mangano (INAF Roma), Nancy Ageorges, Wolfgang Hummel, Gaspare Lo Curto, Olivier Marco, Roberto Mignani (ESO) on behalf of a larger Collaboration | We report on IR VLT adaptive optics (2003 October 7th; H and Ks band) and Chandra (2003 November 1st; HRC-I) ToO observations of the field of the new candidate Anomalous X--ray Pulsar (AXP) XTE J1810-197 (also known as CXOU J180951.1-194351; IAUC 8168 , IAUC 8190 , ATEL #193, ATEL #195, Ibrahim et al. 2003, astro-ph/03... | 2003-11-04 23:12:00 | infra-red,optical,x-ray,neutron star,pulsar,star,transient,variables |
204 | New X-ray Transient XTE J1748-361 (may be A1744-36) | Ron Remillard, Alan Levine, Dacheng Lin (MIT) and Don Smith (U Michigan) | Observations with the RXTE All-Sky Monitor reveal X-ray emission from a source at (J2000, degrees) 266.97, -36.14 (uncertainty 0.2 degrees at 90% confidence). The source was first detected on Nov. 3 2003, at a flux (2-12 keV) of 42 (7) mCrab, increasing to a range of 100-120 mCrab (daily averages) during Nov. 4-6. The ... | 2003-11-08 03:31:00 | x-ray,black hole,pulsar,transient |
205 | Precise X-ray position of A1744-36 (=XTE J1748-361?) | J. McClintock (CfA), S. Murray (CfA), M. Garcia (CfA) and P. Jonker (IoA) | The Ariel-5 X-ray transient A1744-36 and the newly-discovered transient XTE J1748-361 may be identical (ATEL #204). Based on a 16 ks Chandra ACIS-S observation of A1744-36 made on 2003 May 28, the position of this source is RA(J2000) = 17:48:19.22, Dec(J2000) = -36:07:16.6 (uncertainty < 1"). | 2003-11-08 21:35:00 | x-ray,transient |
206 | OIR observations of A1744-36 (=XTE J1748-361?) | M. Buxton, C. Bailyn (Yale) | We have observed the field of the X-ray transient A1744-36, suggested to be the same as XTE J1748-361 (ATEL #204, #205). Observations were made using the SMARTS 1.3m telescope at CTIO with the ANDICAM camera in V, I and K bands. There is one visible source consistent with the coordinates given in ATEL #205 which has th... | 2003-11-11 05:56:00 | infra-red,optical,x-ray,transient |
207 | Archival radio observations of XTE J1810-197 | B. M. Gaensler (Harvard-Smithsonian CfA), C. L. Brogan (IfA, U Hawaii) | We report on deep radio observations made with the Very Large Array (VLA) of the field of the newly discovered anomalous X-ray pulsar (AXP) XTE J1810-197 (also known as CXOU J180951.1-194351; IAUC 8168 , IAUC 8190 , ATEL #188, ATEL #193, ATEL #195, ATEL #203, Gotthelf et al, astro-ph/0309745; Ibrahim et al, astro-ph/03... | 2003-11-18 19:00:00 | radio,x-ray,gamma ray,neutron star,pulsar,soft gamma-ray repeater,star,supernova remnant,supernovae,transient,variables,a comment |
208 | Radio observations of XTE J1748-361 (= A1744-36?) | S. Corbel (Univ. Paris 7), R. P. Fender (Univ. Amsterdam), T. Tzioumis (ATNF), C. Brocksopp (MSSL) | We report on radio observations of the recent X-ray transient XTE J1748-361 (ATEL #204), which is possibly coincident with A1744-36 (Atel #205, # 206). Radio observations have been carried out with the Australia Telescope Compact Array (ATCA) on 2003 November 12 (MJD 52955.77). If XTE J1748-361 is associated with A1744... | 2003-11-20 22:28:00 | radio,x-ray,binary,black hole,neutron star,star,transient |
209 | The Orbital Period of the X-ray Pulsar XTE SMC144s | R. H.D. Corbet (GSFC and USRA), S. Laycock (CfA), F. E. Marshall (GSFC), C. B. Markwardt (GSFC and University of Maryland), M. J. Coe (Southampton University) | We have detected three additional outbursts from the 144s pulse period transient X-ray pulsar in the direction of the Small Magellanic Cloud with the RXTE Proportional Counter Array since the outburst that was reported in ATEL #163.
We have continued to monitor the SMC since that time with observations made at interva... | 2003-11-21 06:38:00 | x-ray,binary,neutron star,pulsar,star,transient |
210 | Radio observations of XTE J1748-361 (=A1744-36?) | M. P. Rupen, V. Dhawan, A. J. Mioduszewski (NRAO) | Very Large Array (VLA) observations of the transient X-ray source XTE J1748-361 (ATEL #204) taken on November 10 UT at 4.86 GHz show:
Following the report of a possible radio counterpart (ATEL #208) at the position of the confusing source mentioned above, we observed that position with the VLA on November 21 UT and de... | 2003-11-26 08:48:00 | radio,x-ray,agn,binary,black hole,neutron star,star,transient |
211 | A very intense X-ray outburst of Vela X-1 detected with INTEGRAL | R. Krivonos (IKI/RSDC, Moscow), N. Produit (ISDC, Versoix), I. Kreykenbohm (IAA, Tubingen & ISDC), R. Staubert (IAA, Tubingen), A. von Kienlin (MPE, Garching), C. Winkler (ESTEC, Noordwijk), N. Gehrels (GSFC, NASA) | We report a very intense hard X-ray outburst detected from Vela X-1 with INTEGRAL/IBIS in the course of deep Core Program observations of the Vela region.
The outburst began on November 28, 2003 at 02:32:52 UT and lasted 15.2 ksec. The S/N ratio measured from the source at the image reached ~270 standard deviations. F... | 2003-12-02 22:00:00 | radio,far-infra-red,infra-red,optical,x-ray,gamma ray,binary,neutron star,pulsar,star,request for observations |
212 | The XMM-Newton Spectrum of 4U 1543-475 in the Low/Hard State and a Comment on Accretion Flow Constraints in this Regime | J. M. Miller (CfA), A. C. Fabian (IoA), W. H. G. Lewin (MIT) | We have analyzed an XMM-Newton/EPIC-pn spectrum of the Galactic black hole 4U 1543-475 in the low/hard state available in the public archive. The 19.5 ksec exposure started on 2002-08-18 UT 12:53:32. The detector was run in "small window" mode with the "thin" optical blocking filter. SAS 5.4.1 was used for data reducti... | 2003-12-05 05:01:00 | optical,x-ray,binary,black hole,transient,a comment |
213 | Radio observations of Vela X-1 during its current intense X-ray outburst | G. Tsarevsky (ATNF, CSIRO, Sydney & ASC FIAN, Moscow) & D. McConnell (ATNF, Sydney) | We report radio observation of the high mass X-ray binary Vela X-1 (=GP Vel), which showed a very intensive hard X-ray outburst detected with INTEGRAL (Krivonos et al., ATEL # 211). Observations with the Australia Telescope Compact Array (6-km configuration, night time, good weather conditions) at 4800 and 8600 MHz on ... | 2003-12-07 09:28:00 | radio,x-ray,binary,neutron star,star,variables |
214 | A New Transient X-ray Pulsar in the SMC (XTE J0055-727) | R. H.D. Corbet (GSFC and USRA), C. B. Markwardt (GSFC and University of Maryland), M. J. Coe & W. R.T. Edge (Southampton University), S. Laycock (CfA), F. E. Marshall (GSFC) | We have detected a new transient X-ray pulsar in the direction of the Small Magellanic Cloud with the RXTE Proportional Counter Array. The source was detected within the 2 degree FWZI field of view of the PCA while pointed at R.A. = 00h53m53s, Decl. = -72o26m42s (equinox 2000.0). Pulsations with periods of 18.37s +/- 0... | 2003-12-17 05:33:00 | x-ray,binary,pulsar,transient |
215 | Position of RXTE 82.4s pulsar (XTE J0052-725) determined using archive Chandra Data. | W. R.T. Edge & M. J. Coe (Southampton University), R. H.D. Corbet (GSFC and USRA), C. B. Markwardt (GSFC and University of Maryland), S. Laycock (CfA), F. E. Marshall (GSFC) | We have determined the position of pulsar XTE J0052-725 from an analysis of archive Chandra data. This source was detected by RXTE on June 19 and 26, 2002 and the results were published in IAUC # 7932 . We noted that there was an X-ray source at R.A. = 00h52m09.1s Decl. = -72º338m03s (equinox 2000), with a 90% confide... | 2003-12-19 00:56:00 | optical,x-ray,binary,pulsar,transient |
216 | Correction to ATEL#215, position of RXTE 82.4s pulsar (XTE J0052-725). | W. R.T. Edge & M. J. Coe (Southampton University), R. H.D. Corbet (GSFC and USRA), C. B. Markwardt (GSFC and University of Maryland), S. Laycock (CfA), F. E. Marshall (GSFC) | The co-ordinates given for the X-ray source and its counterpart in ATEL#215 contained typographical errors. The correct co-ordinates for the source are: R.A. = 00h52m09.1s Decl. = -72º38m03s (equinox 2000). Similarly those for the optical counterpart are: R.A. = 00h52m09.1s Decl. = -72º38m03s. | 2004-01-02 19:41:00 | optical,x-ray,binary,pulsar,transient |
217 | Two new X-ray pulsars detected in the SMC using archive Chandra data (CXOU J005527.9-721058 and CXOU J005455.6-724510). | W. R.T. Edge, M. J. Coe and V. A. McBride (Southampton University) | Two new X-ray pulsars have been detected in the SMC using archive Chandra data. An examination of Chandra Observation ID 2948, which took place between 2002-07-04 09:47:57 and 2002-07-04 12:45:44 (Zezas et al. astro-ph/0310562, 2003), shows an X-ray source at R.A. = 00h55m27.9s Decl. = -72d10m58s (equinox 2000) with a ... | 2004-01-15 21:16:00 | x-ray,binary,pulsar,transient |
218 | Correction to ATEL #182 (XTE J1739-302) | D. M. Smith (UC Santa Cruz), W. A. Heindl (UC San Diego) | The Chandra coordinates reported for XTE J1739-302 in ATEL #182 were incorrect by approximately 6 arcsec due to a typographical error. The correct coordinates are
RA = 17 39 11.58, DEC = -30 20 37.6
This is approximately 0.65 arcsec from the counterpart found in the USNO A2.0 catalog, 0525 28760590.
We apologize for... | 2004-01-18 05:03:00 | x-ray,transient |
219 | XMM-Newton TOO observation of the SMC field around XTE J0055-727: Two transient X-ray pulsars in outburst (XMMU J005455.4-724512 and XMMU J005517.9-723853). | F. Haberl (MPE), W. Pietsch (MPE), N. Schartel (ESA, Vilspa), P. Rodriguez (ESA, Vilspa) and R. H.D. Corbet (GSFC and USRA) | An XMM-Newton target of opportunity observation of the field around the transient pulsar XTE J0055-727 (ATEL #214) in the Small Magellanic Cloud was performed on 2003-12-18 between 14:32 UT and 19:48 UT. Two bright X-ray sources were detected by the EPIC instruments. XMMU J005455.4-724512 is consistent in position with... | 2004-01-22 16:15:00 | x-ray,binary,pulsar,transient |
220 | A new X-ray pulsar has been detected in the SMC using archive Chandra data (CXOU J005323.8-722715). | W. R.T. Edge, M. J. Coe and V. A. McBride (Southampton University) | A new X-ray pulsar has been detected in the SMC using archive Chandra data. An examination of Chandra Observation ID 2947, which took place between 2002-07-20 23:03:50 and 2002-07-21 01:46:41 (Zezas et al. astro-ph/0310562, 2003), shows an X-ray source at R.A. = 00h53m23.8s Decl. = -72d27m15s (equinox 2000) with a 90% ... | 2004-01-23 00:45:00 | x-ray,binary,pulsar,star,transient |
221 | Variability in the X-ray Warm Absorber in GX 339-4 | J. M. Miller (CfA), J. Raymond (CfA), A. C. Fabian (Cambridge), R. Wijnands (Amsterdam), M. van der Klis (Amsterdam), W. H. G. Lewin (MIT) | We have previously reported evidence for a Seyfert-like warm absorber in the stellar-mass Galactic black hole GX 339-4, based on a Chandra/HETGS spectrum obtained during a 75 ksec observation during its 2002-2003 outburst starting on 2003 March 17.8 [1]. The ionized absorption lines detected with this observation were ... | 2004-01-23 03:55:00 | x-ray,binary,black hole,transient,variables,a comment |
222 | State/Spectral Transition of the Ultraluminous Supersoft X-ray Source in M101 | A. K.H. Kong and R. Di Stefano (Harvard-Smithsonian Center for Astrophysics) | We analyzed recent archival Chandra observations of the spiral galaxy, M101, taken between 2004 Jan 19 and 2004 Jan 24. The ultraluminous supersoft X-ray source (CXOU J140332.3+542103) reported by Mukai et al. (2003) and Di Stefano and Kong (2003) was detected in 2 of 3 recent Chandra ACIS-S observations. In the first ... | 2004-01-28 19:12:00 | x-ray,binary,black hole |
223 | IGR J06074+2205 a new X-ray source discovered by INTEGRAL | J. Chenevez, C. Budtz-Jorgensen, N. Lund, N. J. Westergaard (Danish Space Research Institute, Copenhagen), P. Kretschmar (ISDC, Geneva & MPE, Garching), J. Rodriguez (CEA, Saclay & ISDC, Geneva), A. Orr (ESTEC, Noordwijk), Wim Hermsen (SRON, Utrecht) | We report the discovery of a new source, IGR J06074+2205, at RA=06h07.4m DEC=22°05' (+-2 arcmin) with both JEM-X telescopes on board INTEGRAL. The source was detected during public observations of the Crab region performed between 15 and 16 February 2003 in the context of the calibration of the INTEGRAL instruments. I... | 2004-01-29 23:25:00 | x-ray,transient |
224 | Two New INTEGRAL Sources: IGR J15479-4529 and IGR J16418-4532 | J. A. Tomsick and R. Lingenfelter (UC San Diego), S. Corbel (Universite Paris 7 and CEA Saclay), A. Goldwurm (CEA Saclay), and P. Kaaret (Harvard-Smithsonian CfA) | We report on detections of two new INTEGRAL sources by the IBIS/ISGRI instrument during a 290 ks observation of the black hole X-ray transient 4U 1630-47 taken during 2003 February 1-5. IGR J15479-4529 is detected at a significance of 17-sigma with coordinates R.A. = 15h47m.9 and Decl. = -45o29' (J2000, 2' uncertainty)... | 2004-01-30 11:34:00 | x-ray,black hole,cataclysmic variable,neutron star,star,transient,variables |
225 | SMC X-3 Identified with RXTE 7.78s Pulsar from Archive Chandra Data. | W. R.T. Edge & M. J. Coe (Southampton University), R. H.D. Corbet (GSFC and USRA), C. B. Markwardt (GSFC and University of Maryland), S. Laycock (CfA) | SMC X-3 (Clark et al. 1978, ApJ, 221, L37) has been identified with a previously detected 7.78s RXTE pulsar by using archive Chandra Data. An examination of Chandra Observation ID 2947, which took place between 2002-07-20 23:03:50 and 2002-07-21 01:46:41 (Zezas et al. astro-ph/0310562, 2003), shows SMC X-3 at R.A. = 00... | 2004-01-30 15:45:00 | optical,x-ray,binary,pulsar,transient |
226 | IGR J06074+2205 - possible association with radio source | Guy Pooley (MRAO, Cavendish Lab, Cambridge UK) | The radio source NVSS J060718+220452 (34.9 mJy at 1.4 GHz, resolution 45 arcsec: Condon et al AJ 115 1693 (1998)) lies some 80 arcsec from the reported position of the transient X-ray source IGR J06074+2205 (ATEL #223). While this is within the current uncertainty in the X-ray position, it may be a chance coincidence. ... | 2004-01-30 18:00:00 | radio,x-ray,transient |
227 | IGR J16393-4643 a possible X-ray counterpart to 3EG J1639-4702 discovered by INTEGRAL | Malizia A., L. Bassani, G. Di Cocco and J. B. Stephen (IASF/CNR Bologna), R. Walter and A. Bodaghee (INTEGRAL Science Data Center) and A. Bazzano (IASF/CNR Roma) | We report the detection of a source, IGR J16393-4643, at RA (2000)= 16h 39.3m and Dec(2000)= -46o 43' (2 arcmin uncertainty) with the IBIS/ISGRI telescope on board INTEGRAL. The source is detected at ~ 20 sigma level in the 20-100 keV range in a cumulative exposure of the Norma Region ( ~700 ks) with an average flux of... | 2004-01-30 21:06:00 | x-ray,gamma ray,black hole,variables |
228 | Her X-1 Apparently Entering A New Anomalous Low State | Patricia Boyd (UMBC and GSFC) and Martin Still (USRA and GSFC) | Her X-1 (= HZ Her) appears to be evolving towards another anomalous low state. RXTE ASM count rates have decreased steadily from 8 cts/s to 1 cts/s at the peak of the long-high state over the last six 35-day precession cycles. This would be the fourth such time Her X-1 has dropped into an anomalous low state, where the... | 2004-02-01 04:41:00 | optical,x-ray,binary,neutron star,pulsar,star,request for observations |
229 | 14 New Unidentified INTEGRAL Sources | R. Walter, A. Bodaghee (ISDC Geneva); E. J. Barlow, A. J. Bird, A. Dean, A. B. Hill, S. Shaw (Southampton); A. Bazzano, P. Ubertini (IASF Roma); L. Bassani, A. Malizia, J. B. Stephen (IASF Bologna); G. Belanger, F. Lebrun, R. Terrier (CEA Saclay) | We report the detection of 14 new unidentified hard X-ray sources by the IBIS/ISGRI instrument onboard INTEGRAL. The sources have been detected in all-sky mosaics built from data of the INTEGRAL core program accumulated between February 27 and October 19, 2003. | 2004-02-09 14:38:00 | x-ray,gamma ray,binary,black hole,neutron star,star |
230 | Increased radio and optical activity in GX 339-4 | Michelle Buxton (Yale), Elena Gallo, Rob Fender (U. Amsterdam), Charles Bailyn (Yale) | Recent optical and radio observations of the black hole X-ray binary jet source GX 339-4 reveal it to be in a brighter optical and radio state since observations were last made in 2003. On UT 2004 Feb 05.34, observations made with the 1.3m CTIO telescope using ANDICAM yielded V=17.7, compared to UT 2003 Oct 27.00 when ... | 2004-02-09 22:16:00 | radio,optical,x-ray,binary,black hole,transient |
231 | Renewed X-ray activity in GX 339-4 | D. M. Smith (U. C. Santa Cruz), W. A. Heindl (U. C. San Diego), J. H. Swank (NASA/GSFC), J. Wilms (IAA Tuebingen), K. Pottschmidt (ISDC) | Recent monitoring of GX 339-4 in the 2-30 keV X-ray band by the Proportional Counter Array (PCA) of the Rossi X-ray Timing Explorer (RXTE) shows that the newly reported activity in the optical and radio (ATEL #230) is accompanied by faint X-ray emission. On February 1 at 04:00 UT, the X-ray count rate was 1 count/secon... | 2004-02-10 15:25:00 | radio,optical,x-ray,binary,black hole,transient,request for observations |
232 | 17 New Identified INTEGRAL Sources | L. Bassani, A. Malizia, J. B. Stephen (IASF Bologna Italy); A. Bazzano, P. Ubertini (IASF Roma Italy); E. J. Barlow, A. J. Bird, A. J. Dean, A. B. Hill, S. E. Shaw (Southampton University Southampton UK); R. Walter, A. Bodaghee (ISDC Geneva Switzerland); G. Belanger, F. Lebrun, R. Terrier (CEA Saclay France); R. Muc... | We report the first detection in the hard X-ray band (>20 keV) of 17 known sources. The sources have been detected by the IBIS/ISGRI instrument on board INTEGRAL and found in all-sky mosaics built from data of the INTEGRAL core program accumulated between February 27 and October 19, 2003. Number ISGRI Ra&Dec(2000) Prob... | 2004-02-13 22:01:00 | radio,x-ray,gamma ray,agn,binary,black hole,cataclysmic variable,nova,pulsar,supernova remnant,supernovae,variables |
233 | First Detection of the X-ray Burster 2S 1711-339 in Quiescence and a Suggested Optical Counterpart. | M. A.P. Torres (CfA), J. E. McClintock (CfA), M. R. Garcia (CfA), S. S. Murray (CfA) | We report on a Chandra observation of the transient low-mass X-ray binary and type-I X-ray burst source 2S 1711-339 (Carpenter et al. 1977,MNRAS,179,270; Wilson et al. 2003,ApJ,596,1220). The 2S 1711-339 region was observed with the Chandra ACIS-S3 CCD array for 25 ks on 2003 February 07. A total of 64 counts were dete... | 2004-02-14 02:16:00 | optical,x-ray,binary,neutron star,star,transient |
234 | Optical periodicity of microquasar candidate MCQC J162847-4152 | Michelle Buxton, Charles Bailyn (Yale U), Leonid Berdnikov (Sternberg Astronomical Institute, Moscow U), Gregory Tsarevsky (ATNF, Sydney, and ASC, Moscow) | We report on CCD photometry of the possible brightest microquasar MCQC J162847-4152 (ATEL #80). This object is coincident with the hard X-ray spectrum ROSAT source 1RXS J162848.1-415241 (ATEL #80), is a prominent radio transient (IAUC 8008 , 8275 ) and exhibits a K5 spectrum star with a strong and rapidly variable H-al... | 2004-02-14 02:44:00 | radio,optical,x-ray,binary,black hole,star,transient,variables |
235 | A radio galaxy as possible counterpart of IGR J21247+5058 | M. Ribo (CEA Saclay, France), J. A. Combi (IAR, Argentina), I. F. Mirabel (CEA Saclay, France and IAFE-CONICET, Argentina) | Within the 2 arcmin-radius position error circle of the recently discovered INTEGRAL source IGR J21247+5058 (ATEL #229) is located the core of the bright radio source 4C 50.55 (also known as GPSR 93.319+0.394, KR2, NRAO 659 or BG 2122+50, among other names). The core has a flat radio spectrum with a peak flux density o... | 2004-02-16 04:50:00 | radio,infra-red,optical,x-ray,gamma ray,agn,binary,black hole,quasar |
236 | Continued birghtening of GX 339-4 in X-rays | T. Belloni (INAF-OAB Merate), J. Homan (MIT), W. Cui (Purdue U.), J. Swank (NASA/GSFC) | A 4.4 ks observation of GX 339-4 with the Rossi X-ray Timing Explorer (RXTE) on Feb. 14 showed that the source is still brightening (see ATEL #231). The average net count rate in the Proportional Counter Array (PCA) was ~20 cts/s/unit (compared to ~1 cts/s/unit on Feb 1 and ~6 cts/s/unit on Feb 6), and varied between ~... | 2004-02-17 06:54:00 | x-ray,binary,black hole,transient |
237 | Flux Transition in Terzan 2 | C. B. Markwardt (U. Maryland & GSFC), J. Swank (GSFC) | The bright X-ray source in Terzan 2 (possibly 4U 1724-307) has undergone a flux transition. In PCA monitoring observations of the galactic bulge, the flux of this source up to November 2003 had been a relatively steady at 20 mCrab. Monitoring observations on Feb 7.6, 10.8 and 14.9 show the flux increasing to levels of ... | 2004-02-18 04:56:00 | x-ray,binary,globular cluster,neutron star,star,transient |
238 | Correction to ATEL #233 (2S 1711-339) and addendum to ATEL #205 (A1744-36) | M. A.P. Torres (CfA), J. E. McClintock (CfA), M. R. Garcia (CfA), S. S. Murray (CfA) | 2S 1711-339: In ATEL #233 the absorbed X-ray flux of 2S 1711-339 was incorrectly given as 2e-15 ergs cm-2 s-1 (0.3-7.0 keV). The correct value obtained by using a blackbody model with kT = 0.24 +/- 0.03 keV or a neutron-star hydrogen-atmosphere model with kT = 0.07 +/- 0.03 keV is 1.0e-14 ergs cm-2 s-1 (0.5-10.0 keV). ... | 2004-02-19 02:50:00 | radio,optical,x-ray,binary,star,transient |
239 | IGR J17418-1212 - A Possible Microquasar with Multiple Identification | Gregory Tsarevsky (Australia Telescope National Facility, Sydney & Astro Space Center, Moscow) | Due to Bassani et al., ATEL #232, the source No. 5 = IGR J17418-1212 (b = 9.4 deg.) was first detected in the hard X-ray band (>20 keV) by the IBIS/ISGRI instrument of INTEGRAL, and is probably identified with 2E1739.1-1210. I call attention that the INTEGRAL object coincides unambiguously with the bright ROSAT source ... | 2004-02-19 12:52:00 | radio,far-infra-red,infra-red,optical,x-ray,binary,black hole,neutron star,star,transient,request for observations |
240 | GX 339-4 detected with INTEGRAL | E. Kuulkers (ESA/ESTEC), A. Bodaghee (ISDC Geneva), L. Foschini (IASF/CNR Bologna), M. Guainazzi (ESA/Vilspa), G. Matt (Universiy of Roma), G. Israel (INAF - OA Roma), F. Nicastro (CfA), T. Oosterbroek (ESA/ESTEC), A. Parmar (ESA/ESTEC), J. Rodriguez (CEA/Saclay & ISDC Geneva), R. Walter (ISDC Geneva) | GX 339-4 was in the field of view during an observation of IGR J16318-4848 with INTEGRAL (UT 2004 Feb 18 03:41 - Feb 18 17:29). Further to the increase in activity reported in the optical/radio (ATel #230) and X-rays (ATel #231, #236), we report the detection of GX 339-4 with Jem-X and ISGRI/IBIS onboard INTEGRAL. Betw... | 2004-02-19 14:30:00 | radio,optical,x-ray,gamma ray,binary,black hole,transient,variables |
241 | INTEGRAL confirms the brightening of 4U 1724-307 | A. Bodaghee (ISDC, Geneva); Niels-Joergen Westergaard (DSRI, Copenhagen); F. Capitano (IASF, Roma); B. McBreen (UC Dublin); J-P Roques (CESR, Toulouse); E. Kuulkers (ESTEC, Noordwijk); S. Molkov (IKI, Moscow); G. G. C. Palumbo (Universita di Bologna) | During an observation of the Galactic Center Deep Exposure performed between February 17 (07:03 UTC) and February 18 (00:01 UTC), JEM-X on board INTEGRAL detected a bright source at position (J2000) RA=17:27:34 DEC=-30:47.9 (1 arcmin uncertainty) corresponding to 4U 1724-307. The source varies between 50 and 100 mCrab ... | 2004-02-19 17:40:00 | x-ray,gamma ray,binary,neutron star,star,transient |
242 | Radio flare in Cygnus X-1 | Guy Pooley (Cavendish Lab, Cambridge UK) | A major and extremely unusual flare in the radio emission from Cygnus X-1 has been detected. The observation at 15 GHz with the Ryle Telescope in Cambridge (UK) started on 2004 Feb 20 at UT 06h15m. The initial flux denstiy was 60 mJy, and rose to 140 mJy in < 30 min, followed by a rapid decline. After about 2 h the flu... | 2004-02-21 16:41:00 | radio,infra-red,optical,x-ray,black hole,transient,request for observations |
243 | IR-brightening of GX339-4 | G. L. Israel (INAF OA Roma), S. Covino (INAF OA Brera), Erik Kuulkers (ESA/ESTEC), and F. M.Zerbi, G. Chincarini, M. Rodono', L. A. Antonelli, P. Conconi, G. Cutispoto, E. Molinari, L. Nicastro, G. Tosti, L. Burderi, S. Campana, C. Campeggi, G. Crimi, R. Cunniffe, J. Danzinger, A. Di Paola, A. Fernandez-Soto, F. Fiore... | We report on IR observations obtained during the scientific verification phase of REMIR (field of view of 11'x11' and a pixel size of 1") mounted on the Nasmith focus of REM, the 60-cm robotic telescope located at the La Silla Observatory, Chile. Several images of the field including the position of the black hole cand... | 2004-02-24 04:47:00 | radio,infra-red,x-ray,binary,black hole,transient,variables |
244 | R-band Observations of 2S 1711-339 in 1998 During Outburst | John A. Tomsick (UC San Diego) | In 1998 August, we obtained optical observations of the field containing the recurrent transient and type I X-ray burster 2S 1711-339 with the CTIO 0.9 meter telescope in an attempt to identify its optical counterpart. Our observations occurred during the only bright X-ray outburst of the past 8 years as determined by ... | 2004-02-28 06:55:00 | optical,x-ray,binary,neutron star,star,transient |
245 | Optical Brightening of Be/X-ray Binary BQ Cam/V0332+53. | Vitaly Goranskij (Sternberg Astronomical Institute, Moscow University), Elena Barsukova (Special Astrophysical Observatory, Russian Academy of Sciences) | BQ Cam is an optical counterpart of X-ray transient V0332+53. The system consists of a Be star and a neutron star. Recently, it has undergone rapid brightening after 9.3 years of quiescence, and has reached its brightness maximum V=15.19 on 2004 January 31. Our photometric CCD monitoring made with SAI 60-cm and SAO 100... | 2004-03-05 21:08:00 | optical,x-ray,binary,neutron star,star,transient |
246 | Possible radio, IR and soft X-ray counterpart of IGR J18027-1455 | J. A. Combi (IAR, Argentina), M. Ribo (CEA Saclay, France), I. F. Mirabel | Within the 2 arcminute-radius position error circle of the recently discovered INTEGRAL source IGR J18027-1455 (ATEL #229), we have found two weak radio sources in the 1.4 GHz NVSS maps. The first one, NVSS J180239-145453, has an estimated J2000.0 ICRS position of RA=18h02m39.94s (+/-0.25s), DEC=-14d54'53.6" (+/-3.3") ... | 2004-03-06 23:19:00 | radio,infra-red,optical,x-ray,gamma ray,agn,binary,black hole,neutron star,quasar,star |
247 | The Black Hole Candidate 4U 1630-47 in the Midst of a Transition to the Hard State | J. A. Tomsick | Monitoring observations by the Rossi X-ray Timing Explorer indicate that the recurrent black hole candidate X-ray transient 4U 1630-47 is undergoing a transition to the Hard state. The energy spectrum, which is well-described by the canonical disk-blackbody plus power-law model (along with interstellar absorption and a... | 2004-03-08 14:10:00 | radio,x-ray,black hole,transient,request for observations |
248 | The LMXRB GX354-0 is flaring in the hard X-rays | Juan Zurita (ISDC Geneva), Angela Bazzano (IASF Roma), Soren Brandt (DSRI Copenhagen), Albert Domingo (LAEFF Madrid), Christoph Winkler (ESA/ESTEC Noordwijk), Serguei Grebenev (IKI Moscow) | GX 354-0 (also known as 4U 1728-34) has been monitored by INTEGRAL as part of the Galactic Center Deep Exposure almost continuously from 2004-02-16 until now. Over that period the source flux measured by IBIS/ISGRI between 20-60 keV featured a smooth increase with a maximum flux of 0.2 Crab measured on February 24th. T... | 2004-03-09 20:23:00 | x-ray,gamma ray,binary,neutron star,star,transient |
249 | Discovery of PSR 1259-63 in VHE Gamma-Rays with H.E.S.S. | M. Beilicke, Universitaet Hamburg; M. Ouchrif, Laboratoire de Physique Nucleaire de Haute Energie, Universite Paris VI and VII; G. Rowell, Max-Planck-Institut fuer Kernphysik; and S. Schlenker, Humboldt-Universitaet, Berlin; on behalf of the H. E.S. S. (High Energy Stereoscopic System) Collaboration | We report detection of very-high-energy gamma-ray emission from the binary millisecond pulsar PSR 1259-63 (1236.72-day orbit) by the H.E.S.S. experiment above a threshold of about 200 GeV (in the observed zenith-angle range, 40o-45o) at the 5.9-sigma level, where previously upper limits were reported by the CANGAROO co... | 2004-03-12 15:32:00 | gamma ray,tev,vhe,binary,neutron star,pulsar,star,request for observations |
250 | Planned Observation Schedule on PSR 1259-63 by the H.E.S.S. experiment in March, 2004 | M. Beilicke, Universitaet Hamburg; M. Ouchrif, Laboratoire de Physique Nucleaire de Haute Energie, Universite Paris VI and VII; G. Rowell, Max-Planck-Institut fuer Kernphysik; and S. Schlenker, Humboldt-Universitaet, Berlin; on behalf of the H. E.S. S. (High Energy Stereoscopic System) Collaboration | Further to our preceding telegram (ATEL #249) on the discovery of very-high-energy gamma-ray emission from the binary millisecond pulsar PSR 1259-63 by the H.E.S.S. experiment above a threshold of about 200 GeV, we present here our planned programme for observations for March, 2004, in order to facilitate simultaneous ... | 2004-03-14 02:28:00 | radio,x-ray,gamma ray,binary,pulsar,request for observations |
251 | Transition to a hard state of 1RXP J130159.6-635806 | M. Chernyakova (ISDC, Geneva), P. Shtykovsky (IKI, Moscow), A. Lutovinov (IKI, Moscow), M. Revnivtsev (IKI, Moscow/MPA, Garching), T. Courvoisier (ISDC, Geneva), R. Walter (ISDC, Geneva), S. Shaw (ISDC, Geneva), G. Cocco (CNR, Bologna), D. Attie (CEA/Saclay), C. Budtz-Jorgensen (DSRI, Copenhagen), W. Hermsen (SRON, Ut... | We report a detection of a transition to a hard state during the possible outburst of a ROSAT source 1RXP J130159.6-635806, located approximately 10 arc minutes from PSR 1259-63. Source was observed with XMM-Newton observatory on 29 January 2004. In the 1-10 keV energy band its intensity (~1.4E-10 ergs/cm2/s ) was foun... | 2004-03-14 19:22:00 | x-ray,transient |
252 | New outburst of IGR J17544-2619 detected with INTEGRAL | S. A.Grebenev (IKI, Moscow), J. Rodriguez (CEA, Saclay & ISDC, Versoix), N. J.Westergaard (DSRI, Copenhagen), R. A.Sunyaev (IKI, Moscow & MPA, Garching), T. Oosterbroek (ESA/ESTEC, Noordwijk) | A new outburst of the hard X-ray transient IGR J17544-2619 (ATEL #190, #192, #194, IAUC # 8202 ) was detected with INTEGRAL during recent observations dedicated to the Galactic Center Deep Exposure. The source was first detected with IBIS/ISGRI on March 8, 2004 at 08h UTC and remained bright during at least 10 hours. T... | 2004-03-19 01:52:00 | radio,infra-red,optical,x-ray,binary,black hole,neutron star,star,transient,variables |
253 | Chandra observations of IGR J16316-4028 | J. Rodriguez (CEA/SAp, France & ISDC Switzerland), L. Foschini (IASF, Italy), A. Goldwurm (CEA), V. Beckmann (GSFC, USA), K. Ebisawa (GSFC & ISDC) | We report on a Chandra Director Discretionary Time observation of the region around IGR J16316-4028 (see Rodriguez and Goldwurm Atel #201) performed on January 18, 2004, 13:01 UT. The analysis of HRC-I data did not reveal any significant (> 3sigma) excess in the field of view (30" X 30"), with an upper limit in flux of... | 2004-03-19 21:34:00 | x-ray,gamma ray,binary,black hole,neutron star,nova,pulsar,star,transient,request for observations |
254 | New X-ray outburst in 4U 1608-52 | Ron Remillard (MIT) and Jon Miller (Harvard-Smithsonian CfA) | The RXTE All-Sky Monitor has detected a new outburst in 4U 1608-52, a neutron-star binary that emits type 1 X-ray bursts. The flux increased from an upper limit of 10 mCrab (3 sigma; 1.5-12 keV), averaged over 2004 March 1-12, to 125 mCrab on March 16, and to 250 mCrab on March 18. Thus far on March 19, the source is h... | 2004-03-19 22:32:00 | x-ray,binary,star,transient |
255 | RXTE PCA Detections of Transient Activity of X-ray Bursters in the Galactic Center Region | C. B. Markwardt (U. Maryland & NASA/GSFC), J. H. Swank (NASA/GSFC) | This report is a summary of recent transient activity in the galactic center region, as measured by scanning observations by the RXTE PCA instrument. The specific sources are: SAX J1747.0-2853, GRS 1747-312, RX J170930.2-263927, 4U 1711-34 (= 2S 1711-339), and 4U 1728-34 (= GX 354-0).
SAX J1747.0-2853 was detected in ... | 2004-03-20 10:16:00 | x-ray,binary,globular cluster,neutron star,star,transient |
256 | INTEGRAL detection of the X-ray outburst of SAX J1747.0-2853 | S. Deluit (ISDC, Geneva), A. Bazzano (IASF, Roma), N. Mowlavi (ISDC, Geneva), S. Grebenev (IKI, Moscow), J-P Roques (CESR, Toulouse), V. Schoenfelder (MPE, Garching), G. Palumbo (Universita di Bologna), S. Brandt (DSRI) | We report the detection with INTEGRAL of a new outburst of the recurrent BeppoSAX hard X-ray transient SAX J1747.0-2853, an emitting type I X-ray bursts neutron star binary.
The source was detected at RA=266.76 DEC=-28.89 (J2000), 30 arcsec precision, for a total exposure of 13880 s between March 20 18:16:57 and March... | 2004-03-24 19:54:00 | x-ray,binary,neutron star,star,transient |
257 | 1E1740.7-2942 and KS1741-293 | S. A.Grebenev (IKI, Moscow), M. G.Revnivtsev (IKI, Moscow & MPA, Garching), R. A.Sunyaev (IKI, Moscow & MPA, Garching) | 1E1740.7-2942, one of the most peculiar persistent hard X-/gamma-ray sources in the Galaxy, a black-hole candidate and a microquasar, was not detected with INTEGRAL during deep Open Program observations of the Galactic center field carried out on March 12-16, 2004. The 3-sigma upper limits for the flux were 1.7 mCrab a... | 2004-03-25 01:46:00 | radio,x-ray,gamma ray,black hole,request for observations |
258 | RXTE Detection of 1E 1740.7-2942 | C. B. Markwardt (U. Maryland & NASA/GSFC), D. M. Smith and N. Bezayiff (U. C. Santa Cruz), J. H. Swank (NASA/GSFC), W. A. Heindl (U. C. San Diego) | Grebenev, Revnivtsev and Sunyaev discuss the recent non-detection by INTEGRAL of 1E 1740.7-2942 (ATEL #257). This source is regularly monitored by RXTE PCA scanning observations and direct pointings, which each occur twice weekly.
In the 2-10 keV band the source has a typical flux of about 25 mCrab. However, in the pa... | 2004-03-25 12:35:00 | x-ray,binary,black hole,transient,a comment |
259 | Detection of Aql X-1 in Hard X-Ray State | S. V. Molkov, A. A. Lutovinov (IKI, Moscow), A. M. Cherepashchuk (SAI, Moscow), R. A. Sunyaev (IKI, Moscow; MPA Garching) | We report a detection of Aql X-1 in the unusual hard spectral state. The source was significantly detected up to 150 keV with INTEGRAL on 24-25 March, 2004 during the Sagitarius Arm Tangent observations. Its spectrum can be described by a simple powerlaw with the photon index of ~2.1 and flux of ~35 mCrab in both 18-60... | 2004-03-27 05:10:00 | x-ray,gamma ray,binary,neutron star,star,transient,request for observations |
260 | Aquila X-1 optical outburst in progress | S. A.Ilovaisky and C. Chevalier (OHP) | The optical counterpart of the recurrent X-ray transient Aquila X-1 has been observed since mid-March 2004 with the Haute-Provence 1.2-m telescope and CCD camera to be in an intermediate brightness state near V = 17.5. The current low soft X-ray (2-10 keV) flux, as detected from this source by the Rossi/XTE ASM since e... | 2004-03-27 08:10:00 | optical,x-ray,binary,neutron star,star,transient |
261 | IGR J07597-3842 - A new INTEGRAL source with candidate counterparts in the radio, IR and X-ray bands | P. R. den Hartog, W. Hermsen, L. M. Kuiper, J. J.M. in 't Zand (SRON Utrecht), C. Winkler (ESA/ESTEC Noordwijk), A. Domingo (LAEFF Madrid) | We report the detection of a new hard X-ray source in 2.2 Msec of exposure on the Vela region as accumulated by INTEGRAL during June/July and November/December 2003. The position is R.A. = 7h 59m 43.5s, Decl. = -38o 42' 36s (Eq. J2000) with an error of 2'. It was detected at a 12-sigma significance level with the INTEG... | 2004-03-29 21:36:00 | radio,infra-red,x-ray,gamma ray,agn |
262 | Optical counterpart of XTE J1709-267 | P. G. Jonker (CfA), M. Buxton (Yale), J. E. McClintock (CfA) | We have discovered the optical counterpart to the recurrent neutron star soft X-ray transient XTE J1709-267 (see ATEL #255) in a 900 s R band image obtained with ANDICAM mounted on the 1.3 m telescope at CTIO on March 26, 2004. The proposed counterpart coincides with the accurate position obtained from a Chandra observ... | 2004-04-01 04:28:00 | optical,x-ray,binary,neutron star,star,transient |
263 | A possible near-infrared/optical counterpart to the new ISGRI source IGR J07597-3842 | M. Molina (Universià degli Studi di Bologna), L. Bassani, A. Malizia, J. B. Stephen (IASF/CNR Bologna), A. Bazzano (IASF/CNR Roma) | We report the presence of a near infrared counterpart (2MASS and DENIS ) in the error box of the Rosat source RXH J075942.0-384359, likely to be associated to the new ISGRI source IGR J07597-3842 located in the Vela region (Atel 261). The 2 MASS object (see K-band image where position and associated uncertainty of the ... | 2004-04-01 20:17:00 | radio,infra-red,optical,x-ray,gamma ray,agn |
264 | IGR J17418-12122 - USNO 0778-0495204 is an AGN. | M. A.P. Torres (CfA), M. R. Garcia (CfA), J. E. McClintock (CfA), D. Steeghs (CfA), J. Miller (CfA), P. J. Callanan (University College, Cork), P. Zhao (CfA), P. Berlind (CfA) | The INTEGRAL/EINSTEIN/ROSAT/NVSS objects IGR J17418-12122, 2E 1739.1-1210, 1RXS J174155.3-121157 and NVSS J174155-121201 have recently been suggested to be the same and considered to be a microquasar candidate with likely counterparts at optical and IR wavelengths (Tsarevsky et al. 2004, ATEL #239; Bassani et al. 2004,... | 2004-04-04 17:21:00 | radio,optical,x-ray,agn,binary,black hole |
265 | A Second Recent Outburst of XTE J1748-361 (or A1744-36) | C. B. Markwardt (NASA/GSFC and U. Maryland) and J. H. Swank (NASA/GSFC) | In November, 2003, Remillard et al. detected a transient with the RXTE ASM, designated XTE J1748-361, which they speculated may be the 1976 Ariel source A1744-36 (ATEL #204).
The RXTE PCA scans of the galactic center confirmed the November outburst (Nov 2.1 UT; 2-10 keV flux 13 mCrab). Since then the source was unobse... | 2004-04-09 23:21:00 | radio,x-ray,binary,black hole,neutron star,star,transient,request for observations |
266 | INTEGRAL observes A1744-361 (XTE J1748-361) in hard X-rays | S. A.Grebenev (IKI, Moscow), P. Goldoni (CEA, Saclay), V. Schönfelder (MPE, Garching), J.-P. Roques (CESR, Toulouse), R. A.Sunyaev (IKI, Moscow & MPA, Garching), T. Courvoisier (ISDC, Versoix), C. Winkler (ESA/ESTEC, Noordwijk) | The X-ray transient A1744-361 (XTE J1748-361) was detected with ISGRI/IBIS on April 7-8, 2004 during the INTEGRAL Galactic Center Deep Exposure observation. The average flux in the 17-45 keV band was equal to 19.8+/-1.6 mCrab (the S/N ratio was 13). The photon spectrum was extending to at least 100 keV. The source was ... | 2004-04-10 01:09:00 | radio,infra-red,optical,x-ray,black hole,nova,transient |
267 | Discovery of the optical counterpart to XTEJ1748-361=A1744-36 | D. Steeghs (CfA), M. A.P. Torres (CfA), J. E.McClintock (CfA), M. R.Garcia (CfA), G. Mallen-Ornelas (CfA) | We report the discovery of the optical counterpart to the X-ray transient XTE J1748-361 using the 6.5m Magellan-Clay telescope at Las Campanas Observatory. Several 5-minute images in the V and R bands were obtained using the MagIC camera on May 31 as well as November 9 2003 when the object was reported in outburst (ATE... | 2004-04-10 06:24:00 | radio,infra-red,optical,x-ray,binary,black hole,neutron star,star,transient,request for observations |
268 | 1989 outburst from A1744-361 | Jean in 't Zand (SRON) | We note that, apart from the outburst in 1976, leading to its discovery (Carpenter et al 1977, MNRAS 179, 27P), and the recent outbursts in December 2003 and April 2004 (Remillard et al. 2003, ATel 204; Markwardt & Swank 2004, ATel 265), A1744-361 was also detected on August 22-23, 1989, with COMIS-TTM (In 't Zand 1992... | 2004-04-11 21:22:00 | x-ray,neutron star,star,transient,a comment |
269 | The Orbital Period of IGR J19140+098 | R. H.D. Corbet (NASA/GSFC and USRA), D. C. Hannikainen (University of Helsinki Observatory), & R. Remillard (MIT) | The power spectrum of the Rossi X-ray Timing Explorer All Sky Monitor light curve of IGR J19140+098 (Hannikainen, Rodriguez, & Pottschmidt 2003, IAUC # 8088 ) obtained between February 24 1996 and April 8 2004 shows a strong modulation at a period of 13.55 days. The mean flux measured with the ASM during this interval ... | 2004-04-16 03:08:00 | x-ray,binary,black hole,neutron star,star,transient |
270 | GX 339-4 going into optical/IR decline | Michelle Buxton, Charles Bailyn (Yale U) | We have been continuously monitoring the black-hole candidate GX 339-4 with the ANDICAM instrument on the 1.3m CTIO telescope in optical and IR bands since the beginning of the latest outburst (ATEL #230, #231, #240). Recent observations indicate that the outburst is now in a declining phase. Our V- and J-band lightcur... | 2004-04-17 06:03:00 | infra-red,optical,binary,black hole,transient |
271 | New ULX in M101 | K. D.Kuntz (GSFC & UMBC) and the M101 Megasecond Collaboration | A new ultraluminous X-ray source has been detected in M101 (NGC 5457) during a recent 142 ks observation by the Chandra X-ray Observatory on 14 March 2004 and 19 March 2004. The source is tentatively labeled CXO M101K J140314.27+541806, although the astrometry is still somewhat uncertain.
The source was listed in the ... | 2004-04-17 09:12:00 | x-ray,binary,transient,variables |
272 | Improved (and revised) position of IGR J19140+0951 with INTEGRAL | C. Cabanac (LAOG, Grenoble), J. Rodriguez (CEA Saclay & ISDC, Versoix), D. Hannikainen (Observatory, Helsinki), N. Lund (DSRI, Copenhagen), P-O. Petrucci (LAOG, Grenoble), G. Henri (LAOG, Grenoble), P. Durouchoux (CEA, Saclay), J. Schultz (Observatory, Helsinki) | We have analysed about 300 ks of JEM-X2 data and about 600ks of IBIS/ISGRI data in order to constrain with more accuracy the position of the transient IGR J19140+0951 (formerly known as IGR J19140+098).
Based on 12 independent detections of the source in JEM-X2 and using JEM-X offline software (Lund et al., 2004) we h... | 2004-04-19 19:48:00 | x-ray,gamma ray,agn,binary,transient |
273 | A New Transient X-ray Pulsar in the SMC (XTE J0051-727) | R. H.D. Corbet (NASA/GSFC and USRA), C. B. Markwardt (NASA/GSFC and University of Maryland), M. J. Coe, W. R.T. Edge (Southampton University), S. Laycock (CfA), F. E. Marshall (NASA/GSFC) | We have detected a new transient X-ray pulsar in the direction of the Small Magellanic Cloud with the RXTE Proportional Counter Array. The source was found within the 2 degree FWZI field of view of the PCA while pointed at R.A. = 00h50m00s, Decl. = -73o06'00" (equinox 2000.0). Pulsations with periods of 293.9 +/- 0.4 s... | 2004-04-28 04:01:00 | x-ray,binary,neutron star,pulsar,star,transient |
274 | A new outburst from XTE J1858+034. Improving the source position. | S. V.Molkov (IKI/SAI, Moscow), A. M.Cherepashchuk (SAI, Moscow), M. G.Revnivtsev (IKI Moscow/MPA Garching), A. A.Lutovinov (IKI Moscow), K. A.Postnov (SAI Moscow), P. Kretschmar (ISDC Versoix, MPE Garching), R. A.Sunyaev (IKI Moscow, MPA Garching) | We report on the detection of a new X-Ray outburst from the X-Ray transient pulsar XTE J1858+034 and improvement of its coordinates.
INTEGRAL observations of the Sgr Arm Tangent field in the end of March 2004 detected a weak source (~2 mCrab in the 18-60 keV energy band, the ISGRI/IBIS telescope) near the position of ... | 2004-04-29 18:29:00 | x-ray,gamma ray,pulsar,transient,request for observations |
275 | New X-ray transient IGR J01363+6610 discovered by INTEGRAL | S. A. Grebenev (IKI, Moscow), P. Ubertini (IASF, Rome), J. Chenevez (DSRI, Copenhagen), A. Orr (ESTEC, Noordwijk), R. A. Sunyaev (IKI, Moscow & MPA, Garching) | A previously unknown X-ray transient, IGR J01363+6610, was discovered by the IBIS/ISGRI telescope on April 19, 2004 during INTEGRAL observations dedicated to the Galactic Plane Scan.
The source position was R.A.=01h36m18s, Decl.=+66d10m36s (equinox 2000.0, position uncertainty 2'). It was within the IBIS field-of-view... | 2004-05-11 21:23:00 | radio,infra-red,optical,x-ray,gamma ray,binary,black hole,neutron star,star,transient |
276 | Search for radio emission from IGR J01363+6610 | Guy Pooley (MRAO, Cavendish Lab, Cambridge) | An observation of IGR J01363+6610 (ATEL #275) at 15 GHz with 4 antennas of the Ryle Telescope, Cambridge UK, on 2004 May 12 from 04h 26m to 14h 07m UT, showed no apparent radio source. The field was centred at ra, dec = 01 36 18 +66 10 36 (J2000), with a FWHM of 6 acrcmin. The rms noise level was 0.27 mJy. | 2004-05-12 23:11:00 | radio,x-ray,transient |
277 | The Orbital Period of the SMC X-ray Pulsar 2E 0050.1-7247 | R. H.D. Corbet (NASA/GSFC and USRA), M. J. Coe, W. R.T. Edge (Southampton University), S. Laycock (CfA), C. B. Markwardt (NASA/GSFC and University of Maryland), F. E. Marshall (NASA/GSFC) | Monitoring of the Small Magellanic Cloud with the RXTE Proportional Counter Array has revealed a periodicity in the X-ray pulsar 2E 0050.1-7247 (Israel et al. 1997, ApJ, 484, L141). An extended outburst from this source was detected on 2003 January 13 and weekly monitoring showed that this particular outburst continued... | 2004-05-13 05:12:00 | x-ray,binary,neutron star,pulsar,star,transient |
278 | New gamma-ray transient, IGR J11305-6256 discovered by INTEGRAL | N. Produit (ISDC, Geneva), J. Ballet (CEN, Saclay), N. Mowlavi (ISDC, Geneva) | A previously unknown gamma-ray transient, IGR J11305-6256, was discovered by the IBIS/ISGRI telescope on May 12, 2004 during INTEGRAL observation of the Carina region. The source position is: R.A.=11h30m34s DEC= -62d55m51s (equinox 2000.0, position uncertainty 5'). It was in the IBIS field-of-view during 58 hours. It w... | 2004-05-14 21:05:00 | gamma ray,binary,black hole,neutron star,star,transient,request for observations |
279 | Aql X-1 optical/IR outburst | D. Maitra, C. Bailyn, R. Winnick (Yale), J. Espinoza, D. Gonzalez (CTIO/SMARTS) | SMARTS consortium observations of the transient neutron star X-ray binary system Aql X-1 suggest that it is coming out of a prolonged Low-intensity state (LIS). In a LIS the optical/IR flux is higher than quiescence level but lower than typical outburst maximum, but there is no detectable flux increase in 2-12 keV RXTE... | 2004-05-18 05:46:00 | infra-red,optical,x-ray,binary,neutron star,star,transient |
280 | INTEGRAL detects an new ouburst from Aql X-1 | J. Rodriguez (CEA/SAp, France & ISDC Switzerland), D. C Hannikainen (Obs. of Helsinki), N. Mowlavi (ISDC) | Further to Maitra et al. (Atel #279), we report on the detection of Aql X-1 in the hard X-rays with the INTEGRAL observatory during observations of GRS 1915+105 performed between May 13 and May 15, 2004. The source is significantly detected by the ISGRI detector of the IBIS telescope in the 20-60 keV and 60-200 keV ene... | 2004-05-18 18:57:00 | radio,millimeter,sub-millimeter,far-infra-red,infra-red,optical,ultra-violet,x-ray,gamma ray,binary,black hole,neutron star,pulsar,star,transient |
281 | IGR J00370+6122 - A new high-mass X-ray binary | P. R. den Hartog (1), L. M. Kuiper (1), R. H.D. Corbet (2), J. J.M. in 't Zand (1), W. Hermsen (1, 3), J. Vink(1), R. Remillard (4), M. van der Klis(3) (1 SRON Utrecht; 2 NASA/GSFC and USRA; 3 University of Amsterdam; 4 MIT) | We report the discovery of a new variable hard X-ray source, IGR J00370+6122, in a 1.2 Ms INTEGRAL observation of the Cassiopeia region in Dec 2003. The source was found twice while analyzing the data in stretches of ~200 ks. It has a maximum significance of 11.2 sigma in an INTEGRAL IBIS/ISGRI map for the 20-60 keV en... | 2004-05-18 20:53:00 | optical,x-ray,gamma ray,binary,neutron star,star,variables |
282 | Optical Identification of 1RXS J003709.6+612131 with BD+60 73 | Robert E. Rutledge (McGill) | Further to the association of 1RXS J003709.6+612131 with the V=9.7 B1Ib star BD+60 73 (ATel #281): This X-ray source has been previously identified with BD+60 73, with a probability of a unique identification of 99.7% ( Rutledge et al 2000 ). The probability was derived using statistical association. | 2004-05-18 21:38:00 | optical,x-ray,gamma ray,binary,neutron star,star |
283 | Superorbital Period in the high mass X-ray binary 2S 0114+650 | S. Farrell, R. Sood (UNSW@ADFA), P. O'Neill (Imperial College) | We report the identification of a superorbital period in the high mass X-ray binary 2S 0114+650. RXTE ASM observations of this object from 1996 Jan 5 to 2003 May 26 show the presence of a modulation at a period of 30.7 +/- 0.2 days. This period is detected using a Lomb-Scargle periodogram, and has a false-alarm probabi... | 2004-05-20 14:34:00 | optical,x-ray,binary,neutron star,pulsar,star |
284 | Correlated X-ray and IR decaying flux from the Anomalous X-ray Pulsar XTE J1810-197 | N. Rea(Univ. Rome2/INAF-OAR), G. L.Israel(INAF-OAR), V. Testa(INAF-OAR), L. Stella(INAF-OAR), S. Mereghetti(IASF-MI), A. Tiengo(IASF-MI), T. Oosterbroek(ESA-ESTEC), V. Mangano(IASF-PA), S. Campana(INAF-OAB), S. Covino(INAF-OAB), G. Lo Curto(ESO), R. Perna(Princeton) | The field of XTE J1810-197 was imaged by VLT-UT4 Yepun with the Nasmith Adaptive Optics System and the High Resolution Near IR Camera (NAOS-CONICA) on 2004 March 12, 13, and 14, as part of a monitoring program for this source. Observations were obtained with sub-arcsecond seeing and good sky conditions, resulting in a ... | 2004-05-21 19:30:00 | infra-red,x-ray,neutron star,pulsar,star,transient |
285 | BD +60 73 = IGR J00370+6122 | Ignacio Negueruela (Univ. Alicante), Pablo Reig (IESL, Foundation for Research and Technology-HELLAS) | A classification spectrum of BD +60 73, reported to be the optical counterpart to IGR J00370+6122 (ATel #281), was taken on the night of 2003 July 7th with the 2.5-m Issac Newton telescope at La Palma. The derived spectral type is BN0.5II-III, where the composite luminosity class indicates an intermediate luminosity. T... | 2004-05-23 05:09:00 | optical,x-ray,binary,neutron star,star,variables |
286 | On-going radio flare in Aql X-1 | M. P. Rupen, A. J. Mioduszewski, V. Dhawan (NRAO) | Very Large Array (VLA) observations of the transient neutron star X-ray binary system Aql X-1, currently active at X-ray, optical, and infrared wavelengths (ATEL #259, #260, #279, #280), show that a faint radio outburst is also underway. Our 8.46 GHz observations gave the following nominal flux densities at the locatio... | 2004-05-27 04:19:00 | radio,infra-red,optical,x-ray,binary,neutron star,star,transient,variables |
287 | Aql X-1 optical state | S. A. Ilovaisky, C. Chevalier (OHP) | CCD photometry of V1333Aql/Aql X-1 obtained with the 1.2-m telescope at Haute-Provence (OHP) in the interval May 18-24 shows the average magnitude to have been nearly constant around V=17. This is comparable to the maximum optical brightness we observed during the weak 2002 (presumably hard) outburst. Publicly availabl... | 2004-05-27 16:05:00 | optical,binary,neutron star,star,transient |
288 | Aql X-1 outburst in Optical/IR/X-rays | D. Maitra, C. Bailyn, R. Winnick (Yale), J. Espinoza, D. Gonzalez (CTIO/SMARTS) | Daily optical/IR imaging of Aql X-1 by the SMARTS consortium using the ANDICAM instrument on the 1.3m telescope confirm the high optical state reported by Ilovaisky and Chevalier (ATEL #287). Around 11th May 2004 the O/IR began a strong rise from a persistent intermediate state (with average magnitudes of R = 17.3 and ... | 2004-05-28 07:12:00 | infra-red,optical,x-ray,binary,neutron star,star,transient |
289 | Chandra and Optical Identification of AX J1841.0-0536 | J. P. Halpern, E. V. Gotthelf, D. J. Helfand, S. Gezari (Columbia U.), G. A. Wegner (Dartmouth) | We observed the field of the transient 4.74 s X-ray pulsar AX J1841.0-0536, suspected to be a Be/X-ray binary [Bamba et al., PASJ, 53, 1179 (2001)], with the Chandra ACIS arrays for 20 ks on 2004 May 12. A bright, variable source was detected off-axis on the I3 CCD at (J2000) 18h41m0s.54, -05°35'46".8. Its spectrum can... | 2004-06-10 23:35:00 | infra-red,optical,x-ray,binary,neutron star,pulsar,star,transient,variables |
290 | burst in 1E 1145.1-6141 | A. Bodaghee (ISDC), N. Mowlavi (ISDC), J. Ballet (CEN-Saclay) | We report the brightening of the high-mass X-ray binary 1E 1145.1-6141 by a factor of 4 in 20--60 keV between June 10 (00:00 UTC) and June 11 (09:30 UTC), reaching about 130 mCrab in this energy range. The burst was recorded by the ISGRI detector on board INTEGRAL during an open observation of the Carina region. To our... | 2004-06-13 01:47:00 | x-ray,gamma ray,binary,pulsar,transient |
291 | The near-IR counterpart to the high-mass X-ray binary X1908+075 | T. Morel (Palermo Observatory, Italy) and Y. Grosdidier (McGill University, Canada) | We report the near-IR identification of the likely counterpart to X1908+075, a highly-absorbed Galactic X-ray source recently suspected to belong to the rare class of OB supergiant-neutron star binary systems (Wen et al. 2000, ApJ, 532, 1119; Levine et al. 2004, ApJ, submitted, astro-ph/0404428). The Einstein and HEAO ... | 2004-06-18 22:05:00 | infra-red,x-ray,binary,neutron star,pulsar,star |
292 | Spectroscopic Observations of MCQC J162847-4152 | M. A. P. Torres (CfA), M. R. Garcia (CfA), D. Steeghs (CfA), J. E. McClintock (CfA), J. S. Bloom (CfA) | We obtained moderate/low resolution spectroscopy (2/5 AA FWHM) of the microquasar candidate MCQC J162847-4152 (hereafter J1628) on 2003 May 5/6/13 (UT) and June 22/23/25 with the B&C spectrograph mounted on the 6.5-m Baade and Clay telescopes at LCO. In addition, high resolution spectra (R~27000 and 36000 in the blue a... | 2004-06-22 14:19:00 | optical,x-ray,binary,star,transient,variables |
293 | Detection of AXP 4U 0142+614 with INTEGRAL | P. R. den Hartog(1), L. Kuiper(1), W. Hermsen(1, 2), J. Vink (1) (1 SRON - National Institute for Space Research, Utrecht, The Netherlands; 2 Astronomical Institute, University of Amsterdam, The Netherlands) | We report the detection of the Anomalous X-ray Pulsar 4U 0142+614 at energies between 20 keV and 100 keV with IBIS/ISGRI aboard INTEGRAL. The source was detected in the field of view of the observations of the Cassiopeia region in December 2003. In the energy bands 20-50 keV and 50-100 keV it showed up with 4.8 sigma a... | 2004-06-28 19:34:00 | x-ray,gamma ray,neutron star,pulsar,star |
294 | Aql X-1 optical outburst ends | S. A.Ilovaisky and C. Chevalier (OHP) | Optical monitoring of the recurrent transient V1333 Aql/Aql X-1 obtained with the 1.2-m Haute-Provence telescope shows that the source slowly declined in brightness over the past two weeks and that it returned to quiescence sometime between UT 26.0 and 27.0 June, the large-amplitude 19-h modulation being absent during ... | 2004-06-29 18:22:00 | optical,x-ray,binary,neutron star,star,transient |
295 | X-ray Reappearance of V4641 Sgr | Jean Swank(NASA/GSFC) | VSNET observers reported that V4741 SGR brightened optically today. Coincidentally V4641 Sgr was observed in the RXTE PCA scans of the Galactic Bulge on 2004 Jul 03, UT 11:54, for the first time since 2004 Jun 01, UT 17:35. The flux was 8.2 mCrab 2-10 keV, while it was last bright (66 mCrab) on 2003 Aug 6 and was gener... | 2004-07-05 02:25:00 | x-ray,binary,black hole,transient,request for observations |
296 | Radio Reappearance of V4641 Sgr | M. P. Rupen, A. J. Mioduszewski, V. Dhawan (NRAO) | Very Large Array (VLA) observations of the black hole candidate binary V4641 Sgr, currently active at optical wavelengths (see VSNet), reveal an on-going radio outburst. Data taken on 5 July 2004 from 07:47 to 09:32 UT gave clear detections of an optically thin, steep spectrum source (flux density going as frequency to... | 2004-07-06 06:59:00 | radio,infra-red,optical,x-ray,binary,black hole,star,transient,variables |
297 | Optical observations of V4641Sgr | M. Revnivtsev (IKI, MPA), I. Khamitov(TUG), R. Burenin(IKI),M. Pavlinsky(IKI),R. Sunyaev (IKI, MPA), Z. Aslan(TUG), I. Bikmaev(KSU),N. Sakhibullin(KSU) | The X-ray binary system V4641 Sgr (=SAX J1819.3-2525) was observed in Rc band with the 1.5-m Russian-Turkish telescope RTT150 at TUBITAK National Observatory (Turkey) during the period 18:57-21:57 UT, July 5, 2004. The Rc magnitude of the source averaged over all observations was m_Rc~13.5, that is slightly higher than... | 2004-07-06 19:45:00 | optical,x-ray,binary,black hole,request for observations |
298 | X-ray Burst from the direction of 1E 1048.1-5937 | V. Kaspi, F. Gavriil (McGill U.), P. Woods (USRA/NSSTC), D. Chakrabarty (MIT) | We report the discovery of a single X-ray burst from the direction of the anomalous X-ray pulsar 1E 1048.1-5937, in data from the Rossi X-ray Timing Explorer Proportional Counter Array, obtained on June 29, 2004. The burst is present in all operational PCUs. A preliminary inspection shows that the burst properties are ... | 2004-07-07 00:54:00 | x-ray,gamma ray,neutron star,pulsar,soft gamma-ray repeater,star,request for observations |
299 | Optical spectroscopy of V4641 Sgr | L. Kiss (University of Sydney), Sz. Meszaros (University of Szeged) | Optical spectra (range 600-690 nm; resolution 6000) were obtained during the current outburst of this black hole binary on July 4.65-4.75 UT with the Siding Spring 2.3-m telescope (+ DBS CCD spectrograph), right after the first visual reports appeared via vsnet-obs and vsnet-alert. The spectra were dominated by a very ... | 2004-07-07 23:01:00 | optical,binary,black hole,request for observations |
300 | Radio Monitoring of V4641 with RATAN-600 | S. A. Trushkin (SAO RAS) | We have daily observed V4641 from 9 May up today at 2.3, 4.8, 7.7, 11.2 and 21.7 GHz with RATAN-600 radio telescope. We have reliably detected V4641 June 25, 21:20UT: | 2004-07-09 03:38:00 | radio,binary,black hole |
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