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 |
|---|---|---|---|---|---|
101 | A new X-ray outburst of XB 1745-25 in the globular cluster Terzan 5 | Rudy Wijnands (MIT), Jeroen Homan (Brera Observatory), Ron Remillard (MIT) | We report the detection of a new X-ray outburst of the neutron star X-ray transient XB 1745-25 located in the globular cluster Terzan 5. The All Sky Monitor aboard the Rossi X-ray Timing Explorer began detecting the source on or near 2002 June 25, when it rapidly rose to 87 +/- 7 mCrab at 2-12 keV. It then appears to h... | 2002-07-03 06:12:00 | radio,infra-red,optical,x-ray,binary,globular cluster,neutron star,star,transient,request for observations |
102 | The optical counterpart to XTE J1855-026 | Francesco Verrecchia (ASDC, Rome), Ignacio Negueruela (University of Alicante), Stefano Covino (INAF - Merate Observatory), GianLuca Israel (INAF - Rome Observatory) | We report observations of the likely optical counterpart to the 361-s X-ray pulsar XTE J1855-026 (Corbet et al. 1999, ApJ 517, 956; Corbet & Mukai 2002, astroph/0207181), which is part of an eclipsing binary with a 6.01-d orbit.
Our candidate is a relatively bright star right on the edge of the new 12" ASCA error circ... | 2002-07-15 03:29:00 | optical,x-ray,binary,neutron star,pulsar,star |
103 | State Transition of the Black Hole Candidate 4U 1543-47 | E. Kalemci, J. Tomsick, R. Rothschild (CASS/UCSD), S. Corbel (CEA Saclay), P. Kaaret (CfA), J. McClintock (Harvard) | An analysis of Rossi X-ray Timing Explorer pointed observations of the black hole transient 4U 1543-475 (see ATEL#98 and IAUC# 7920 ) indicates that the source is currently in transition, possibly to the low hard state. The X-ray spectra of two observations taken on July 23 and July 24 show a multicolor disk component ... | 2002-07-27 03:58:00 | radio,optical,x-ray,binary,black hole,transient,request for observations |
104 | Magnitudes of X-ray Nova XTE J1650-500 in Quiescence | M. R. Garcia (CfA), B. J. Wilkes (CfA) | Observations of the optical counterpart to XTE J1650-500 with the Magellan 1 telescope find it fainter than expected based on reports of it's possible detection on the DDS2 red (Groot etal IAUC 7708 ) and blue (Castro-Tirado etal IAUC 7707 ) plates. The observations were made with the Sackler MagIC CCD camera in non-ph... | 2002-08-10 10:25:00 | optical,x-ray,binary,black hole,nova,star,transient |
105 | Low Quiescent X-Ray and Radio Flux Levels from the Black Hole Transient V4641 Sgr | John A. Tomsick (UCSD), Michael P. Rupen (NRAO), Stephane Corbel (Universite Paris VII and CEA Saclay), Vivek Dhawan (NRAO), Rob Fender (University of Amsterdam), Philip Kaaret (Harvard-Smithsonian CfA), Erik Kuulkers (Utrecht University and SRON), Jon M. Miller (MIT), Amy J. Mioduszewski (NRAO), Jerome A. Orosz (SDSU)... | Recent X-ray and radio observations of the dynamically confirmed black hole transient and relativistic radio jet source V4641 Sgr indicate that the source may be in a low quiescent state after its high level of activity in 2002 May and June (IAUCs 7906 , 7908 and 7928 ). The source was not detected in the X-ray band du... | 2002-08-21 02:19:00 | radio,x-ray,binary,black hole,transient |
106 | A new X-ray outburst of the black-hole candidate 4U 1630-47 | Rudy Wijnands (University of St Andrews), Ron Remillard (MIT), Jon M. Miller (CfA) | We report the detection of a new X-ray outburst of the recurrent X-ray transient and black-hole candidate 4U 1630-47. The All Sky Monitor aboard the Rossi X-ray Timing Explorer began detecting the source on or near 2002 September 10, when it rapidly rose to 0.3-0.4 Crab (2-12 keV) on 2002 September 13. This renewed act... | 2002-09-14 03:45:00 | radio,infra-red,x-ray,binary,black hole,transient,request for observations |
107 | The recent evolution of radio emission from GX 339-4 | Rob Fender (Amsterdam), Stephane Corbel (Paris VII & CEA Saclay), Tasso Tzioumis (ATNF), Steven Tingay (ATNF), Catherine Brocksopp (Liverpool John Moores), Elena Gallo (Amsterdam) | We report on the evolution of the radio emission from the black hole candidate GX 339-4, as observed with the Australia Telescope Compact Array (ATCA). These observations are associated with the re-appearance of GX 339-4 as a bright X-ray source following approximately three years in an "Off" state, and subsequent tran... | 2002-09-19 19:38:00 | radio,x-ray,black hole,transient |
108 | Follow-up radio observations of the black hole candidate 4U 1630-47 | Diana Hannikainen (Univ. of Helsinki), Bob Sault (ATNF), Erik Kuulkers (ESA/ESTEC), Kinwah Wu (MSSL/UCL), Paul Jones (ATNF), Richard Hunstead (Univ. of Sydney) | Following the report of renewed X-ray activity from the black hole candidate 4U 1630-47 (ATEL #106) we observed the source with the Australia Telescope Compact Array (ATCA) with observation midpoints at 2002 September 16.3, September 19.4 and September 24.4 UT.
On September 16, four of the six ATCA antennas observed 4... | 2002-09-28 03:22:00 | radio,x-ray,black hole,transient |
109 | Rossi X-ray Timing Explorer observations of the black-hole candidate 4U 1630-47 during its 2002 outburst | Jeroen Homan (INAF-OAB) & Rudy Wijnands (University of St. Andrews) | After the detection of renewed X-ray activity from the recurrent X-ray transient and black-hole candidate 4U 1630-47 (ATEL #106), the source has been monitored frequently with the Rossi X-ray Timing Explorer (RXTE). We have analysed the publicly available RXTE observations performed during 12 and 26 September 2002 UT, ... | 2002-10-03 01:57:00 | radio,x-ray,binary,black hole,transient |
110 | New outburst of SAX J1808.4-3658 | C. B. Markwardt (U. Maryland & NASA/GSFC), J. M. Miller (CfA) & R. Wijnands (University of St. Andrews) | SAX J1808.4-3658 The authors report the discovery of a new outburst of the first known millisecond accreting pulsar SAX J1808.4-3658. In RXTE PCA scans of the galactic center performed on Oct 13.279 (UT), an X-ray source whose position is consistent with SAX J1808.4-3658 was detected with a flux of 65 mCrab (2-10 keV).... | 2002-10-15 10:31:00 | radio,optical,x-ray,binary,neutron star,pulsar,star,transient |
111 | New Transient XTE J1450-603 | C. B. Markwardt (U. Maryland and GSFC), F. E. Marshall and J. H. Swank (GSFC) | C. B. Markwardt, University of Maryland and Goddard Space Flight Center (GSFC), F. E. Marshall and J. H. Swank (GSFC), report the serendipitous discovery of a new transient, designated XTE J1450-603, by the RXTE PCA during slews between planned targets on Nov 15.5 and 20.2 (UT). A dedicated PCA cross scan occurred on N... | 2002-12-04 05:56:00 | x-ray,binary,black hole,neutron star,star,transient |
112 | Follow-up radio observations of the field around the new transient XTE J1450-603 | Bob Sault (ATNF), Diana Hannikainen (U. Helsinki), Tasso Tzioumis (ATNF), Kinwah Wu (MSSL/UCL) | We observed the field around XTE J1450-603 (ATel #111) with the Australia Telescope Compact Array on Dec 6.8 for 2 hours at 3 and 6 cm. Two sources were found: both are "faint" and are not listed in the PMN catalog. The flux (at 6 and 3 cm respectively) and position (J2000) of the sources are:
The fluxes are corrected... | 2002-12-16 18:14:00 | radio,x-ray,transient |
113 | New Transient, XTE J1730-318 | R. A. Remillard, A. M. Levine, and E. H. Morgan (M. I.T.), E. Smith, and J. Swank (NASA GSFC) | We report the discovery of a transient X-ray source at (J2000) 17h19m58s, -31 46'.8 (estimated 3' uncertainty at 90% confidence). The source was first detected on 2003 January 9 when the average flux (2-12 keV) was 130 +- 20 mCrab. The intensity increased to 430 +- 40 mCrab on Jan. 10 and 400 +- 20 mCrab on Jan. 13. A ... | 2003-01-15 05:05:00 | radio,optical,x-ray,black hole,transient |
114 | Name Correction: XTE J1720-318 | R. A. Remillard, A. M. Levine, and E. H. Morgan (M. I.T.), E. Smith, and J. Swank (NASA GSFC) | There was a typo in the title field of ATEL #113. The position and other information given in the text are correct, but the source name is XTE J1720-318., as correctly reported to vsnet and IAUC. Apologies to ATEL. | 2003-01-15 08:24:00 | x-ray,black hole,transient |
115 | Refined position and spectrum for XTE J1720-318 | C. B. Markwardt (U. Maryland and GSFC) | I report further information on RXTE PCA observations of the new transient XTE J1720-318. Observations from 2002 Jan 15.06-15.10 were analyzed, the first 1500 ks of which contained a raster scan pattern, and remainder was pointed near the source position. From the raster scan portion of the data, I determine a best-fit... | 2003-01-16 08:24:00 | x-ray,binary,black hole,transient |
116 | Supernova 2002hi | D. Pooley and W. H. G. Lewin (MIT) | D. Pooley and W. H. G. Lewin, Massachusetts Institute of Technology, on behalf of a larger collaboration, report the detection of X-ray emission at the position of the type-IIn supernova (SN) 2002hi (IAUC 8006 ) with the Chandra X-ray observatory: An ACIS-S3 observation of 10 ks was made on Dec. 10.73. In the 0.5-10 ke... | 2003-01-18 05:05:00 | x-ray,supernovae |
117 | Improved IR (ISAAC/VLT) and radio (ATCA) astrometry of the likely counterpart to XTE J1720-318 | Kieran O'Brien (ESO, Chile), Fraser Clarke (ESO, Chile), Rob Fender (Amsterdam), Catherine Brocksopp (MSSL), Danny Steeghs (CfA), Rob Hynes (Texas) and Phil Charles (Southampton) | We report VLT observations (Proposal 270.D-5025) of the field of the newly discovered X-ray transient, XTE J1720-318 (ATEL #113), together with an improved radio position.
We obtained a series of 60 Ks band images with ISAAC on VLT/UT1 on 21st Jan 2003 between UT 09:27 and UT 09:57. The combined image has a limiting m... | 2003-01-23 22:40:00 | radio,infra-red,x-ray,black hole,transient |
118 | Recurrent Transient X1901+031 | D. Galloway, R. Remillard, E. Morgan (M. I.T.), and J. Swank (NASA GSFC) | We report a new X-ray outburst in a transient last seen in 1970-71 (Forman et al. 1976, ApJ 206, L29). The ASM position is R.A. = 19h03m33s, Decl. = +3 12'.4 (equinox J2000.0; estimated 3' uncertainty at 90% confidence). This position is within the 10' error box originally estimated for X1901+031, but is almost 10' awa... | 2003-02-13 01:18:00 | optical,x-ray,binary,neutron star,pulsar,star,transient,request for observations |
119 | XMM-Newton followup of IGR J16318-4848 | J. de Plaa, P. R. den Hartog, J. S. Kaastra, J. J. M. in 't Zand, M. Mendez and W. Hermsen (SRON National Institute for Space Research, Utrecht, The Netherlands) | We report a spectral analysis of the Febr. 10 TOO XMM-Newton observation of the new bright X-ray source IGR J16318-4848 (IAUC # 8063 ). During the 27 ks observation the source shows large variations in countrate by roughly a factor of 3 in both EPIC MOS2 and PN detectors. The MOS2 and PN spectra can simultaniously be r... | 2003-02-21 14:04:00 | x-ray,transient |
120 | State Transition of GX 339-4 | D. M. Smith, E. Kalemci (Space Sciences Laboratory, U. C. Berkeley), J. A. Tomsick, W. A. Heindl (Center for Astrophysics and Space Science, U. C. San Diego) | The black hole candidate GX 339-4, in outburst for nearly a year (ATEL #85) has lately been declining rapidly in luminosity in the soft state and has now started to show signs of a transition to the low/hard state. We have been monitoring this source twice weekly with the Proportional Counter Array (PCA) on the Rossi X... | 2003-02-25 10:22:00 | radio,x-ray,gamma ray,black hole,transient,request for observations |
121 | Improved position for the X-ray pulsar X1901+031 | D. K. Galloway, R. Remillard, and E. Morgan (MIT) | We report an improved position for the recurrent X-ray transient X1901+031 (ATEL #118). Based on an RXTE/PCA scan on Feb. 12, we derive a position of R.A. = 19h03m37.083s, Decl. = +3 11 31.20 (equinox J2000.0; estimated 1' uncertainty at 90-percent confidence). This position is 1.3' away from the previous ASM position,... | 2003-02-26 06:28:00 | optical,x-ray,binary,neutron star,pulsar,star,transient,request for observations |
122 | Discovery of a Fourth Accreting Millisecond Pulsar, XTE J1807-294 | C. B. Markwardt (U. Maryland & GSFC), E. Smith (GSFC) & J. H. Swank (GSFC) | C. B. Markwardt, University of Maryland and Goddard Space Flight Center (GSFC), and E. Smith and J. H. Swank, GSFC, report that RXTE PCA monitoring observations of the galactic center region have revealed a new millisecond pulsar, designated XTE J1807-294. PCA cross scans on Feb 21.6 (UT) determined the position to be ... | 2003-02-26 10:55:00 | x-ray,binary,neutron star,pulsar,star,transient,variables,request for observations |
123 | Counterpart to XTE J0119-731 | M. J. Coe and B. T. Gaensicke (Southampton University) | We report optical spectroscopic observations of the field of the new 2.16s X-ray pulsar in the SMC were carried out on the night of 7/8 February 2003, shortly after it was reported by Corbet et al in IAUC # 8064 on 3 February 2003. Two emission-line optical counterparts were first identified by searching the XTE error ... | 2003-02-27 00:45:00 | optical,x-ray,binary,neutron star,pulsar,star,transient |
124 | Aquila X-1 Active Again | J. Swank(GSFC), E. Smith (GSFC), J. Miller (CfA), & R. Remillard (MIT) | The RXTE All Sky Monitor (ASM) detected a reactivation of the recurrent transient and bursting neutron star Aquila X-1 about 24 Feb 2003 at a level of about 43 mCrab (1.5-12 keV). The count has risen to a level of about 110 mCrab on 27 Feb 2003. A pointed observation with the Proportional Counter Array (PCA) at 18 UT 2... | 2003-02-28 04:40:00 | x-ray,binary,neutron star,star,transient,request for observations |
125 | Aql X-1 optical/IR outburst | D. Maitra(Yale), M. Buxton (Yale), S. Tourtellotte (Yale), C. Bailyn (Yale) | SMARTS consortium observations of Aql X-1 began on 02/26/2003 with the 1.3m telescope at CTIO + ANDICAM instrument. In the subsequent 5 days, the source brightened by ~1.2 mag in R and ~0.8 mag in J. We note that these measurements include light from the near neighbor star V1333 Aql (Chevalier et al., 1999, A&A, 347,L5... | 2003-03-08 00:08:00 | infra-red,optical,x-ray,binary,neutron star,star,transient |
126 | A New Outburst of 4U 1608-52 | Jon M. Miller (CfA), Jean Swank, Evan Smith, and Craig Markwardt (GSFC) | On MJD 52710.2, the RXTE ASM found activity in the neutron star low-mass X-ray binary 4U 1608-52 at a level of 250 +/- 20 mCrab. Summing ASM dwells into one-day averages, 4U 1608-52 was first detected on MJD 52707.4 at a flux of 30 +/- 20 mCrab, rising to 100 +/- 20 mCrab on MJD 52708.5. Dwells today (MJD 52710) have m... | 2003-03-13 04:19:00 | x-ray,binary,neutron star,star,transient |
127 | XTE J1807-294 - precise position and orbit determination | C. B. Markwardt (U. Maryland & GSFC), M. Juda (CfA), J. H. Swank (GSFC) | C. B. Markwardt, University of Maryland and Goddard Space Flight Center (GSFC), M. Juda, Harvard-Smithsonian Center for Astrophysics, and J. H. Swank, GSFC report that the Chandra X-ray Observatory observed XTE J1807-294 on Mar 10.8 (UT), and the best fit position was determined to be R.A. = 18h06m59.80s, Decl. = -29o2... | 2003-03-16 23:21:00 | optical,x-ray,binary,neutron star,pulsar,star,transient |
128 | RXTE PCA Snapshots of IGR J16318-4848 and IGR J19140+098 | J. H. Swank (GSFC) & C. B. Markwardt (U. Maryland & GSFC) | RXTE carried out brief observations of the INTEGRAL sources IGR_J19140+098 (Hannikainen et al. 2003, IAUC 8088 )and IGR_J16318-4848 (Courvoisier et al. 2003, IAUC 8063 ; see also Murakami et al. 2003, IAUC 8070 and Schartel et al. 2003, IAUC 8072 ). No pulsations were identified from either. The data will be public. IG... | 2003-03-18 10:50:00 | x-ray,binary,black hole,pulsar,transient |
129 | A New Fast, Soft X-Ray Transient Discovered with the RXTE/ASM | D. A. Smith (U. of Michigan) & R. Remillard (MIT) | The All-Sky Monitor on RXTE has detected an unusually soft rapid X-ray transient that we designate XTE J1200+521. It was detected in nine consecutive observations, allowing the position to be constrained to a ~30' error box at 90% confidence (including an estimate of systematic error) with the following corners:
RA: ... | 2003-03-19 01:58:00 | x-ray,gamma ray,binary,gamma-ray burst,star,transient,request for observations |
130 | Soft X-ray Transient is Likely a Reflected Solar Flare | D. A. Smith (U. of Michigan) & R. Remillard (MIT) | It was pointed out to us that there was a solar flare measured by GOES, precisely consistant in both start time and duration with the flare seen in the ASM data. Given that the moon's position was within a half-degree of our best-fit position for the transient, we conclude that this event was most likely a solar flare ... | 2003-03-19 05:03:00 | x-ray,transient,request for observations |
131 | IGR J16358-4726 in archival data of ASCA and BeppoSAX | M. Revnivtsev (MPA, Germany; IKI, Moscow), A. Lutovinov (IKI, Moscow), K. Ebisawa (ISDC, NASA/GSFC) | We report that our analysis of the archival data of ASCA and BeppoSAX observations revealed a weak X-ray source at position consistent with that of X-ray transient IGR J16358-4726 (IAUC # 8097 ). The source was seen in the ASCA observation on Feb.26, 1999 at the position: R.A.=16h35m53s, Dec.=-47o25.3' (equinox 2000, p... | 2003-03-25 16:33:00 | x-ray,binary,transient,request for observations |
132 | IGR J17464-3213 | M. Revnivtsev (IKI, Moscow; MPA, Garching), M. Chernyakova (ISDC, Geneve), F. Capitanio (IAS, Rome), N. J. Westergaard (DSRI, Copenhagen), V. Shoenfelder (MPE, Garching), N. Gehrels(GSFC/NASA), C. Winkler (ESTEC, Noordwijk) | We report the discovery of a variable source with the ISGRI detector of the IBIS instrument onboard ESA's INTEGRAL satellite on March 21. The source position is R.A.=17h46.4m, Dec.=-32o13' (equinox 2000, position uncertainty 2'). The source flux increased by a factor of 3 from March 21 to March 26. Its flux averaged ov... | 2003-03-29 02:05:00 | x-ray,binary,black hole,transient,variables,request for observations |
133 | XTE J1746-322 = IGR J17464-3213 = H1743-322 | C. B. Markwardt (U. Maryland & GSFC) and J. H. Swank (GSFC) | C. B. Markwardt (U. Maryland & GSFC) and J. H. Swank (GSFC) report the detection of a new source in RXTE PCA galactic bulge scans on MJD 52723.84, designated XTE J1746-322. The best fit position is R.A. = 17h46m30s, Decl. = -32o10' (equinox 2000.0), with approximate errors of 10', due to nearby confusing sources. This ... | 2003-03-29 11:15:00 | x-ray,gamma ray,binary,black hole,transient |
134 | New X-ray outburst of XTE J1550-564 | Erik Kuulkers (ESA/ESTEC), Ron Remillard (MIT), Jon M. Miller (CfA) | E. Kuulkers (ESA/ESTEC), R. Remillard (MIT), and J.M. Miller (CfA), report that the renewed activity of XTE J1550-564 (IAUC # 8100 , CBET #12) is now also seen in the RXTE/ASM. The source started to appear around March 29. Between March 29 and 31 the 2-12 keV flux was between 40 and 65 mCrab, with a mean of 55+/-3 mCra... | 2003-03-31 22:11:00 | x-ray,binary,black hole,transient,request for observations |
135 | Initial RXTE Observations of the 2003 Outburst of XTE J1550-564 | Jon M. Miller (CfA) and Jeroen Homan (Oss. di Brera, Merate), on behalf of a larger collaboration | At present, we have obtained four observations of the current outburst of XTE J1550-564 with RXTE. The observations occurred on 27 March (2.2 ksec, 3.5 ksec), 29 March (2.9 ksec), and 30 March (1.9 ksec). Strong flaring, on several time scales, was observed in the light curves of all four observations. In the combined ... | 2003-04-02 01:06:00 | optical,x-ray,binary,black hole,transient |
136 | Clarification on the association between IGR J17464-3213 and H1743-322 | C. B. Markwardt (U. Maryland & GSFC) and J. H. Swank (GSFC) | In ATEL #133, we commented that newly reported INTEGRAL transient IGR J17464-3213 (ATEL #132) may be HEAO source H1743-322 (also known as H1741-322).
The most commonly known position for H1743-322 is taken from the HEAO A-1 catalog (Wood et al. 1984, ApJS, 56, 507). However, there are in fact two candidate positions f... | 2003-04-02 11:01:00 | x-ray,binary,black hole,transient,a comment |
137 | Radio counterpart to IGR J17464-3213 = XTE J17464-3213 | M. P. Rupen, A. J. Mioduszewski, and V. Dhawan (NRAO) | M.P. Rupen, A.J. Mioduszewski, and V. Dhawan (National Radio Astronomy Observatory [NRAO]) report the detection of a probable radio counterpart to the the X-ray transient and black hole candidate IGR J17464-3213 = XTE J17464-3213 (ATEL #132; ATEL #133). Observations with the Very Large Array (VLA) on 30 March and 1 Apr... | 2003-04-03 01:46:00 | radio,x-ray,gamma ray,binary,black hole,transient,variables,request for observations |
138 | RXTE ASM Observations of H1743-322 = IGR J17464-3213 | Ron Remillard (MIT) for the ASM team at MIT and NASA/GSFC | Observations of this X-ray transient with the RXTE All-Sky Monitor determines a position (to 0.1 degrees) that is consistent with the INTEGRAL source (ATEL #132), the XTE PCA source (ATEL #133), and the radio source (ATEL #137). Furthermore, all of these positions are consistent with the eastern choice of the two allow... | 2003-04-03 06:48:00 | radio,x-ray,black hole,pulsar,transient |
139 | IGR J17464-3213 = XTE J17464-3213: Request for IR Observations | M. P. Rupen, A. J. Mioduszewski, and V. Dhawan (NRAO) | We report further radio observations of the X-ray transient and black hole candidate IGR J17464-3213 = XTE J17464-3213 (ATEL #132; ATEL #133; IAUC 8105 ) from the Very Large Array (VLA). The source continues to brighten, and appears now to be doubling in flux density every two days. Observations on 4 April 2003 UT give... | 2003-04-05 05:08:00 | radio,infra-red,x-ray,gamma ray,binary,black hole,transient,request for observations |
140 | Optical observations of IGR J17464-3213 | I. Khamitov, M. Parmaksizoglu (TUG), M. Revnivtsev (IKI, MPA), I. Bikmaev, N. Sakhibullin (KSU, AST), R. Sunyaev, M. Pavlinsky (IKI), Z. Aslan, O. Golbasi (TUG) | We made optical observations of X-ray transient IGR J17464-3213 = H1743-322 in I-filter by using 1.5-m Russian-Turkish telescope RTT150 at Bakyrlytepe (TUBITAK National Observatory, Turkey) in the night 5/6 April 2003. Search for the source at the radio position, reported by Rupen et al. (ATEL#137,IAUC # 8105 , ATEL#13... | 2003-04-07 00:08:00 | radio,infra-red,optical,x-ray,binary,black hole,nova,transient,request for observations |
141 | IGR/XTE J17464-3213: Magellan optical upper limits | D. Steeghs, J. M.Miller (CfA), D. Kaplan (Caltech), M. Rupen (NRAO) | We report optical observations of the field of the transient IGR/XTE J17464-3213 using the Magic CCD camera on the Magellan-Clay telescope at Las Campanas Observatory. Johnson R and I-band images obtained on April 5 2003 with an image seeing of 0.5" reveal no optical counterpart at the radio position reported by Rupen ... | 2003-04-08 06:10:00 | radio,infra-red,optical,x-ray,gamma ray,binary,black hole,transient |
142 | Strong radio flare in XTE J1746-322 = IGR J17464-3213 | M. P. Rupen, A. J. Mioduszewski, and V. Dhawan (NRAO) | We report a strong radio flare from the X-ray transient and black hole candidate XTE J1746-322 = IGR J17464-3213 (ATEL #132; ATEL #133) = H1743-322 (ATEL #136; ATEL #138; IAUC 8105 ). Observations with the Very Large Array (VLA) on April 6 and 8 2003 show the source increased in flux density by almost a factor 5 at 4.9... | 2003-04-09 09:09:00 | radio,x-ray,gamma ray,binary,black hole,transient,request for observations |
143 | SLX 1746-331 | C. B. Markwardt (U. Maryland & GSFC) | C. B. Markwardt (U. Maryland & NASA/GSFC) reports the detection of a source in the galactic center region with RXTE PCA bulge monitoring scans, whose position is consistent with that of SLX 1746-331 (Skinner et al. 1990, MNRAS, 243, 72). This position is quite distinct from that of the recently-active IGR J17464-3213 (... | 2003-04-09 11:09:00 | x-ray,binary,black hole,transient,request for observations |
144 | ASM Observations of SLX 1746-331 | R. A. Remillard and A. M. Levine (ASM team at MIT and GSFC) | The RXTE All-Sky Monitor has also detected continuously increasing flux from a position coincident with that of SLX 1746-331 (ATEL #143) during 2003 April 6-9. On April 9.36 the X-ray intensity was near 270 mCrab (2-12 keV). There has been some spectral hardening (3-12 keV) on April 8 and 9, compared with results on Ap... | 2003-04-09 23:27:00 | x-ray,transient |
145 | INTEGRAL observation of SLX1746-331 | A. Lutovinov (IKI, Moscow), P. Kretschmar (ISDC, Geneva), C. Budtz-Joergensen (DSRI, Copenhagen), A. Domingo (LAEFF, Madrid),V. Schoenfelder (MPE, Garching), G. Palumbo (Universita degli Studi di Bologna), C. Winkler (ESTEC, Noordwijk). | We report the detection with the JEM-X telescope of the INTEGRAL observatory of a transient source SLX1746-331 in the galactic center region. This outburst was first reported by RXTE (ATEL #143, #144). The source was detected during a routine scan of the Galactic Plane on Apr 8 with a flux of ~200 mCrab in the 3-10 keV... | 2003-04-11 02:04:00 | x-ray,gamma ray,transient |
146 | IGR/XTE J17464-3213: New radio position and optical counterpart | D. Steeghs, J. M.Miller (CfA), D. Kaplan (Caltech), M. Rupen (NRAO) | Taking into account all VLA observations of this source up to April 8, we have obtained a revised radio position for IGR/XTE J17464-3213;
17 46 15.608 +/- 0.17" -32 14 00.6 +/- 0.5" (J2000)
This is 0.7" south of the position reported in IAUC 8105 bringing the VLA position closer to a nearby optical counterpart presen... | 2003-04-11 02:19:00 | radio,infra-red,optical,x-ray,gamma ray,black hole,transient,request for observations |
147 | A New X-Ray Transient Discovered with XMM | L. Sidoli (IASF/CNR, Milan), S. Mereghetti (IASF/CNR, Milan) | A new transient X-ray source in the Galactic Center Region has been discovered with EPIC in a XMM-Newton observation performed on March 12 2003. The position of the source is RA (J2000.0)=17 47 16.0 Dec (J2000.0)=-28 10 45 with an uncertainty of 5 arcsec. The source spectrum can be fit with an absorbed powerlaw with ph... | 2003-04-14 20:11:00 | x-ray,transient |
148 | XTE J1807-294: Modulation of the pulsed flux with a refined spin period and orbit parameters | M. G.F. Kirsch (ESA XMM-SOC), E. Kendziorra (IAATuebingen) | The accreting millisecond pulsar XTE J1807-294, discovered by RXTE on February 21 (Markwardt et al., IAUC 8080 ), was observed by XMM-Newton March 22, 2003 under ObsId 01579601 in revolution number 0601. The observation started on 2003-03-22T13:40:27Z. The EPIC pn-CCD camera was operated in Timing mode with the thick f... | 2003-04-17 01:04:00 | x-ray,binary,neutron star,pulsar,star,transient |
149 | IGR J17091-3624 | E. Kuulkers (ESA/ESTEC), A. Lutovinov (IKI, Moscow), A. Parmar (ESA/ESTEC), F. Capitanio (IAS, Roma), N. Mowlavi (ISDC), W. Hermsen (SRON, Utrecht) | We report the discovery of a new transient source with the IBIS/ISGRI detector onboard the INTEGRAL observatory, which we designate as IGR J17091-3624. The source position is RA=17h09.1m and DEC=-36o24m38s (equinox J2000, uncertainty ~3').
The source was first seen during a pointed observation between UT 2003 April 14... | 2003-04-20 00:56:00 | x-ray,gamma ray,transient,request for observations |
150 | IGR J17091-3624 in archival data of MIR/KVANT/TTM | M. Revnivtsev, M. Gilfanov, E. Churazov, R. Sunyaev (IKI, Moscow; MPA, Garching) | We report that analysis of archival data of TTM telescope aboard KVANT module of MIR orbital station revealed the detection of recently discovered X-ray source IGR J17091-3624 (ATEL#149) in several subsequent observations performed on Oct.1-10, 1994. The source position was determined as R.A.=17h09m06s, Dec.=-36o24'07"... | 2003-04-20 01:23:00 | x-ray,binary,transient,request for observations |
151 | IGR J18539+0727 | A. Lutovinov (IKI, Moscow), J. Rodriguez (CEA, Saclay), N. Produit (ISDC), N. Lund (DSRI, Copenhagen), W. Hermsen (SRON, Utrecht), R. Much (ESA/ESTEC) | We report the discovery with the IBIS/ISGRI detector onboard the INTEGRAL observatory of a new transient source IGR J18539+0727. The source was detected during a routine scan of the Galactic Plane and deep observations of GRS1915+105 field on April 17-18. Its position is RA=18h53.9m and DEC=+7o27m (equinox 2000, positi... | 2003-04-21 20:34:00 | x-ray,gamma ray,transient,request for observations |
152 | Possible radio counterpart to IGR J17091-3624 | M. P. Rupen, A. J. Mioduszewski, V. Dhawan (NRAO) | Observations with the Very Large Array (VLA) at 4.9 GHz show a possible radio counterpart to IGR J17091-3624, with a flux density of 1.9+/-0.3 mJy, and a J2000 position of | 2003-04-23 23:38:00 | radio,x-ray,gamma ray,transient,request for observations |
153 | INTEGRAL detection of Hard X-ray emission from XTEJ1720-318 | P. Goldoni (SAp/CEA, Saclay), A. Goldwurm (SAp/CEA, Saclay), E. Kuulkers (ESA/ESTEC), A. Parmar (ESA/ESTEC), C. Budtz-Joergensen (DSRI, Copenhagen), G. Palumbo (Universita' degli studi di Bologna), J. P. Roques (CESR, Toulouse), R. Sunyaev (IKI, Moscow;MPA Garching), P. Favre (ISDC, Geneva) | We report the detection of the soft X-Ray transient XTE J1720-318 (ATEL #113, ATEL #115) with the IBIS/ISGRI instrument onboard the INTEGRAL observatory during routine scans of the Galactic Center region and two pointed observations of the source IGRJ1746-3213(=H1743-322), all performed in April. The source started to ... | 2003-04-25 02:02:00 | radio,x-ray,binary,black hole,transient,request for observations |
154 | IGR J18325-0756 | Lutovinov A. (IKI, Moscow), Shaw S. (ISDC/Southampton), L. Foschini (IASF/CNR, Sezione di Bologna), J. Paul (CEA, Saclay) | We report the discovery of a new transient source, IGR J18325-0756, with the IBIS/ISGRI detector onboard the INTEGRAL observatory. Its position is RA=18h32.5m and Dec=-07o56m (equinox 2000, position uncertainty ~3').
The source was first detected during observations of the Galactic Centre field performed between April... | 2003-04-28 21:20:00 | x-ray,gamma ray,transient,request for observations |
155 | IGR17597-2201 and AX1820.5-1434 | A. Lutovinov (IKI, Moscow), R. Walter (ISDC), G. Belanger (CEA, Saclay), N. Lund (DSRI), S. Grebenev (IKI, Moscow), C. Winkler (ESA/ESTEC) | We report the discovery of a new transient source IGR J17597-2201 with the IBIS/ISGRI detector onboard the INTEGRAL observatory. Its position is RA=17h59.7m and Dec=-22o01m (equinox 2000) with uncertainty ~2'. The source was detected during several deep observations of the Galactic center field. The measured flux in a ... | 2003-04-30 17:19:00 | x-ray,gamma ray,binary,pulsar,transient,request for observations |
156 | IGR J17597-2201 = XTE J1759-220 | C. B. Markwardt (U. Maryland & NASA/GSFC) and J. H. Swank (NASA/GSFC) | We report that the transient detected by Lutovinov et al. (ATEL #155), IGR 17597-220, is at a position consistent with a transient which has been active since at least 07 Feb 2001, when it was first detected in RXTE PCA galactic bulge scans.
Dedicated PCA scans on 19 May 2001 determined a best fit PCA position to be R... | 2003-05-01 22:09:00 | x-ray,binary,neutron star,star,transient,a comment |
157 | IGR J18483-0311 | M. Chernyakova (ISDC, Geneva), A. Lutovinov (IKI, Moscow), F. Capitanio (CNR, Rome), N. Lund (DSRI, Copenhagen), N. Gehrels (GSFC/NASA) | We report the discovery of a new transient source, IGR J18483-0311, with the IBIS/ISGRI detector onboard the INTEGRAL observatory. The source position is RA=18h48.3m and DEC=-03o11m (equinox 2000), with uncertainty ~2' (including statistical and systematical errors). This position is 0.7 arcminute from the position of ... | 2003-05-03 00:41:00 | x-ray,gamma ray,transient,request for observations |
158 | Optical observations of the IGR J18539+0727 field | N. Masetti (IASF/CNR, Bologna) and L. Foschini (IASF/CNR, Bologna & ISDC, Geneve) | We report optical observations of the field of the transient IGR J18539+0727 (Lutovinov et al., ATel #151) acquired with the BFOSC instrument mounted on the Bologna Astronomical Observatory 1.5-m "G.D. Cassini" telescope located in Loiano (Italy).
A single 20-minute R-band image was acquired starting at 01:43 UT of 20... | 2003-05-09 23:09:00 | optical,x-ray,gamma ray,binary,black hole,neutron star,star,transient |
159 | An X-ray outburst of GS1843+009 detected with INTEGRAL | A. M.Cherepashchuk (SAI, Moscow), S. Molkov (IKI, Moscow), L. Foschini (IASF/CNR, Section of Bologna & ISDC, Geneve), M. Orlandini (IASF/CNR, Section of Bologna), S. Grebenev (IKI, Moscow), E. Palazzi (IASF/CNR, Section of Bologna) | We report the detection of a hard X-ray outburst of the transient X-ray pulsar GS1843+009 with the IBIS/ISGRI telescope aboard INTEGRAL. The source was detected during the May 1-11 observing run at a S/N ratio of ~20 in the 18-100 keV energy range. The preliminary measured fluxes were about 15, 10 and 10 mCrab in the 1... | 2003-05-14 23:35:00 | x-ray,pulsar,transient |
160 | BeppoSAX measurements of IGR J17091-3624 = 1SAX J1709-36 | J. J.M. in 't Zand, J. Heise, and P. Lowes (Space Research Organization Netherlands, Utrecht), P. Ubertini (CNR Istituto di Astrofisica Spaziale e Fisica Cosmica, Rome) | On Sept. 20.7 through 21.7 and Sept. 29.8 through Oct. 1.1, 2001 (UT), the Wide Field Cameras on BeppoSAX detected a source which coincides with the recently reported new X-ray source IGR J17091-3624 (Kuulkers et al., ATel #149). From combined data taken during August-October 2001, the source was localized to R.A. = 17... | 2003-05-20 22:37:00 | radio,x-ray,gamma ray,binary,black hole,neutron star,star,transient,variables |
161 | 4U 1630-47 Enters a Bright X-Ray Flaring State | John A. Tomsick (UC San Diego) | The black hole candidate X-ray transient 4U 1630-47 is currently undergoing an extended outburst that began in 2002 September (see ATELs #106, #108, and #109) and has now persisted for nearly 260 days. Over the past 10 days (MJD 52,776-52,786), the source brightened from 20 c/s to over 40 c/s in the Rossi X-ray Timing ... | 2003-05-28 00:59:00 | x-ray,black hole,transient |
162 | High Frequency Quasi-Periodic Oscillations in the X-ray Flux of the Black Hole Candidate H 1743-322 = IGR/XTE J1746(4)-3213 | J. Homan (OAB, Merate), J. M. Miller (CfA), R. Wijnands (St. Andrew's), D. Steeghs (CfA), T. Belloni (OAB, Merate), M. van der Klis (Amsterdam), and W. H. G. Lewin (MIT) | We report on a ~25 ks RXTE observation of the soft X-ray transient and black hole candidate H 1743-322 (= IGR/XTE J1746(4)-3213, see ATELs 146, 142, 141, 140, 139, 138, 137, 136, 133, 132) performed on May 28 2003 (05:02 UTC - 16:53 UTC). The source was observed at a 3-100 keV flux of ~2.5x10e-8 ergs/cm^2/s with a spec... | 2003-06-01 01:13:00 | radio,far-infra-red,infra-red,optical,x-ray,binary,black hole,transient |
163 | New Transient X-ray Pulsars in the SMC (XTE J0103-728, XTE SMC144s) | R. H.D. Corbet (GSFC and USRA) C. B. Markwardt (GSFC & University of Maryland) F. E. Marshall (GSFC), M. J. Coe and W. R.T. Edge (Southampton University) and S. Laycock (CfA) | We have detected two new transient X-ray pulsars in the direction of the Small Magellanic Cloud with the RXTE Proportional Counter Array. The sources were detected within the 2 degree FWZI field of view of the PCA while pointed at R.A. = 00h53m53s, Decl. = -72o26m42s (equinox 2000.0).
A source with a period of 6.8482 ... | 2003-06-05 05:47:00 | x-ray,binary,neutron star,pulsar,star,transient |
164 | Revised Orbit and Burst Oscillations from the Millisecond Pulsar XTE J1814-338 | C. B. Markwardt (U. Maryland & GSFC), T. E. Strohmayer and J. H. Swank (GSFC) | C. B. Markwardt, University of Maryland and Goddard Space Flight Center (GSFC), T. E. Strohmayer and J. H. Swank (GSFC) report on further observations of the newly discovered accreting millisecond pulsar XTE J1814-338. In IAUC 8144 , we reported that the position of the source, as derived from RXTE PCA scans on Jun 5.1... | 2003-06-11 22:36:00 | x-ray,binary,neutron star,pulsar,star,transient,a comment |
165 | The aperiodic timing behaviour of XTE J1814-338 | Rudy Wijnands (University of St Andrews) and Jeroen Homan (OAB, Merate) | We report on the aperiodic timing behaviour of the accretion-driven millisecond X-ray pulsar XTE J1814-338 (IAUC 8144 ) as observed with the Rossi X-ray Timing Explorer between 8 and 11 June 2003. These observations were already used by Markwardt et al. (ATEL #164) to report on the improved orbital period of the system... | 2003-06-12 04:06:00 | x-ray,binary,neutron star,pulsar,star,transient |
166 | XTE J1814-338 is likely the EXOSAT slew source EXMS B1810-337 | Rudy Wijnands (University of St Andrews) & Alastair Reynolds (ESTEC) | We report that the new X-ray transient and accretion-driven millisecond X-ray pulsar XTE J1814-338 (IAUC 8144 , ATEL #164 and #165) is at a position consistent with the source EXMS B1810-337 listed in the EXOSAT medium-energy slew survey catalogue (Reynolds et al. 1999, A&AS 134, 287, Table 5). The error box of EXMS B1... | 2003-06-19 00:41:00 | x-ray,binary,neutron star,pulsar,star,transient,a comment |
167 | XTE J1811-197: Position and Fluxes of A New 5.54 s pulsar | C. B. Markwardt (U. Md. & GSFC), A. I. Ibrahim (GWU), J. H. Swank (GSFC) | In Ibrahim et al. (GCN #2306), we reported the presence of a 5.54 s pulsar, detected in the RXTE PCA field of an observation of SGR 1806-20. At the time, we speculated that the pulsar could either be the source of soft gamma repeater bursts seen by the IPN (GCN #2297); or, a previously unknown pulsar simultaneously act... | 2003-07-23 22:49:00 | x-ray,gamma ray,binary,neutron star,pulsar,soft gamma-ray repeater,star,transient,request for observations |
168 | Corrected Name for 5.54 s Pulsar: XTE J1810-197 | J. H. Swank (GSFC), C. B. Markwardt (U..Md. & GSFC), A. I. Ibrahim (GWU) | In ATEL 167, we reported the position of a new source as R.A. = 18h10.9m, Decl. = -19o42' (equinox 2000.0) , with estimated 99% confidence semi-major axes of 5' in R.A. and 7' in Decl. We designated the new pulsar as XTE J1811-197. The same name appeared in CBET 36. It was brought to our attention by Dr. Marion Schmitz... | 2003-07-28 23:32:00 | x-ray,neutron star,pulsar,star,transient |
169 | A state transition in the black-hole candidate SLX 1746-331 | Jeroen Homan (INAF/OAB, Merate) and Rudy Wijnands (University of St Andrews) | Since the detection in April 2003 of a new outburst of the black hole candidate SLX 1746-331 (ATEL #143, #144, and #145), the RXTE/PCA has been monitoring the source every 3-4 days. Currently, a total of 65 ksec of data has been obtained. The source has decreased slowly in flux (3-25 keV; unabsorbed) from 5.4E-9 ergs/s... | 2003-07-30 18:12:00 | radio,x-ray,black hole,transient |
170 | Optical Outburst of V4641 (=SAX J1819.3-2525) | M. Buxton (Yale), D. Maitra (Yale), C. Bailyn (Yale), L. Jeanty (Yale), D. Gonzalez (CTIO) | SMARTS consortium observations of the black hole candidate V4641 Sgr with the 1.3m telescope at CTIO + ANDICAM instrument from UT 2003 Aug 4.00 indicate that the source is starting a new outburst. The B, V, and I magnitudes were 12.8, 12.6 and 12.2, which is 1.1, 1.1 and 1.1 magnitudes above the predicted quiescent val... | 2003-08-05 06:31:00 | optical,binary,black hole,transient |
171 | X-ray and Optical Activity in V4641 Sgr (=SAX 1819.3-2525) | C. Bailyn, D. Maitra, M. Buxton, L. Jeanty (Yale), D. Gonzalez (CTIO) | V4641 Sgr is now active in X-rays, and activity continues in optical/IR bands. A ~1 kilosecond dwell with the RXTE/PCA taken August 5 2003 starting at UT 01:18 shows flux varying from 20 to 35 mCrabs. On August 6 between UT 08:43 - 09:31 the source was in a highly active flaring state, with flares of up to 100 mCrabs e... | 2003-08-07 06:55:00 | infra-red,optical,x-ray,black hole,transient |
172 | Strong radio flare in V4641 Sgr (= SAX J1819.3-2525) | M. P. Rupen, A. J. Mioduszewski, & V. Dhawan (NRAO) | We report a strong radio flare from the X-ray transient and likely black hole binary V4641 Sgr, which has recently become active again in the optical (ATEL #170) and X-ray (ATEL #171) bands. Observations with the Very Large Array (VLA) on August 6, 2003 gave strong detections at both 4.86 and 8.46 GHz, compared with a ... | 2003-08-07 22:04:00 | radio,infra-red,optical,x-ray,binary,black hole,transient |
173 | The optical counterpart to the transient X-ray pulsar SAX J2103.5+4545 | Pablo Reig (University of Valencia) and Fotis Mavromatakis (University of Crete) | We report observations of the likely optical counterpart to the 358.61-s X-ray pulsar SAX J2103.5+4545 (Hulleman et al. 1998, A&A, 337,L25).
Optical photometric observations of the field around the best-fit BeppoSAX position (R.A:=21:03:33, DEC = +45:45.0) carried out on 2003 June 8.96 with the 1.3-m telescope of the ... | 2003-08-08 01:00:00 | optical,x-ray,binary,pulsar,star,transient |
174 | Rapid optical variability of V4641 Sgr (=SAX J1819.3-2525) | I. Khamitov, Z. Aslan (TUG), K. Yakut (EgeU), I. Bikmaev, R. Gumerov, N. Sakhibullin (KSU), R. Sunyaev, M. Revnivtsev (IKI, MPA), M. Pavlinsky (IKI) | 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 Bakyrlytepe during the period 19:01-22:16 UT, Aug. 6, 2003. The Rc magnitude of the source averaged over all observations was m_Rc~11.7. Time resolution of the photometric data is 9.7 sec. Th... | 2003-08-08 04:11:00 | optical,x-ray,binary,black hole,transient,request for observations |
175 | Further radio observations of V4641 Sgr (= SAX J1819.3-2525) | M. P. Rupen, V. Dhawan, & A. J. Mioduszewski | We report further radio observations of the X-ray transient and likely black hole binary V4641 Sgr (ATEL #170, #171, #172, #173, #174). Observations with the Very Large Array (VLA) August 8 and 9, 2003 gave flux densities of 4.08+/-0.08 and 3.07+/-0.11 mJy, respectively, at 4.86 GHz; and 2.84+/-0.05 and 2.16+/-0.09 mJy... | 2003-08-09 14:23:00 | radio,optical,x-ray,binary,black hole,transient,variables,request for observations |
176 | IGR J16479-4514 | S. Molkov (IKI, Moscow), N. Mowlavi (ISDC), A. Goldwurm (CEA, Saclay), A. Strong (MPE, Garching), N. Lund (DSRI), J. Paul(CEA, Saclay), T. Oosterbroek (ESA/ESTEC) | We report the discovery of a new transient source, IGR J16479-4514, with the IBIS/ISGRI detector onboard the INTEGRAL observatory. The source position is RA=16h47.9m, and DEC= -45d 14' (equinox 2000, position uncertainty around 3'). The source was detected during observations of the Galactic Center field performed betw... | 2003-08-12 02:52:00 | x-ray,gamma ray,transient,request for observations |
177 | Variable Water Maser Line in ZCMa | M. Teodorani (IRA/CNR, Italy) | M. Teodorani, Istituto di Radioastronomia, Consiglio Nazionale delle Ricerche, Bologna, reports that in April 16, 2003 a strong 22-GHz water-maser line was detected in the FUor-type protostar Z Canis Majoris. The Medicina 32-m radio telescope was used in connection with a high-resolution spectrum analyzer (8192 channel... | 2003-08-13 15:34:00 | radio,variables |
178 | INTEGRAL Detection and Improved Position of EXO 1722-363 | A. Lutovinov (IKI, Moscow), M. Revnivtsev (IKI, Moscow/MPA, Garching), S. Molkov (IKI, Moscow) | We report an improved position for the X-ray pulsar X1722-363. Based on the INTEGRAL/IBIS data we derive a position of the source R.A. = 17h25.4m Decl. = -36o18' (equinox J2000.0; 2' uncertainty). This position is 9.1' away from the EXOSAT position, which was measured with accuracy of 9' (Warwick et al. 1988, MNRAS 232... | 2003-08-21 01:21:00 | x-ray,gamma ray,neutron star,pulsar,star |
179 | Detection of Orbital Period of EXO 1722-363 | C. B. Markwardt (U. Maryland & GSFC) & J. H. Swank (GSFC) | In regards to Lutovinov et al.'s report of activity from EXO 1722-363 (ATEL #178), the source has been detected in RXTE PCA scans of the galactic center since Feb 1999. Ginga observations showed it to have a 413 s pulse period. (It was designated GPS 1722-363 by Tawara et al. 1989, PASJ, 41, 473.) Between Feb 1999 and ... | 2003-08-21 10:29:00 | x-ray,binary,neutron star,pulsar,star,transient,a comment |
180 | INTEGRAL observes IGR J17464-3213 in the soft state | P. Kretschmar (ISDC, Geneva & MPE, Garching), J. Chenevez (DSRI, Copenhagen), F. Capitanio (IASF/CNR, Roma), A. Orr (ESTEC, Noordwijk), G. Palumbo (Universita degli Studi di Bologna), S. Grebenev (IKI, Moscow) | The X-ray transient and black hole candidate IGR J17464-3213 (ATEL #132) = H1743-322, XTE J1746-322 (ATEL #133, #136) has been observed again during the Galactic Center Deep Exposure of the INTEGRAL Core Program.
Compared to previous INTEGRAL observations the source has now changed to a soft state and is visible with ... | 2003-08-22 02:16:00 | x-ray,gamma ray,black hole,transient |
181 | Possible new source IGR J17391-3021 or an outburst from XTE J1739-302 | R. Sunyaev (IKI, Moscow/MPA, Garching), A. Lutovinov (IKI, Moscow), S. Molkov (IKI, Moscow), S. Deluit (ISDC) | We report a detection of a possible new transient source IGR J17391-3021 with the IBIS/ISGRI detector onboard the INTEGRAL observatory. The source position is RA = 17h39.1m, Dec = -30o21.5' (equinox 2000, uncertainty 3'). It is close to the position of the known transient source XTE J1739-302 (angular distance is ~5.5'... | 2003-08-27 22:14:00 | x-ray,gamma ray,binary,transient,variables,request for observations |
182 | XTE J1739-302 | D. M. Smith (UCSC), W. A. Heindl (UCSD), J. H. Swank (NASA/GSFC), T. E. Harrison (NMSU), I. Negueruela (Alicante) | XTE J1739-302, which has just been reported as in outburst by Sunyaev et al. (ATEL #181), was observed previously by Chandra, although the results have not yet been published. The accurate position is
RA = 17 39 11.1, DEC = -30 20 37.6
This is close to the INTEGRAL position, increasing the probability that the curren... | 2003-08-28 03:00:00 | infra-red,optical,x-ray,binary,star,request for observations |
183 | Burst activity of SGR1806-20 | R. A.Sunyaev (IKI, Moscow; MPA, Garching), V. V.Zheleznyakov (API, N. Novgorod), A. M.Cherepashchuk (SAI MSU), D. A.Varshalovich (IPTI, St-Petersburg), S. V.Molkov (IKI, Moscow), A. A.Lutovinov (IKI, Moscow), S. A.Grebenev (IKI, Moscow) | During the period 24-25 Aug. 2003 a set of INTEGRAL observations of the Galactic Center was performed as a part of an Open Program. The source SGR 1806-20 was permanently in the field of view of IBIS telescope and revealed a burst activity. Several soft gamma ray bursts with different duration (40-250 ms) and intensiti... | 2003-08-28 18:03:00 | x-ray,gamma ray,gamma-ray burst,soft gamma-ray repeater |
184 | Radio observations of XTE J1739-302/IGR J17391-3021 | M. P. Rupen, A. J. Mioduszewski, V. Dhawan (NRAO) | Very Large Array (VLA) observations of the transient X-ray source IGR J17391-3021 (possibly a recurrence of XTE J1739-302; ATEL #181) on August 28 UT show one radio source at 4.86 GHz within the INTEGRAL three arcminute error circle (ATEL #181), at
There are no plausible counterparts to XTE J1739-302 in this radio ima... | 2003-08-30 07:26:00 | radio,x-ray,gamma ray,binary,transient |
185 | GRS 1758-258 | R. Sunyaev (IKI, Moscow/MPA, Garching), A. Lutovinov (IKI, Moscow), S. Molkov (IKI, Moscow) | The black-hole candidate GRS1758-258 was observed with IBIS/INTEGRAL on Aug 24-29, 2003. Comparison with results of previous observations of this source with GRANAT/SIGMA, RXTE, CGRO, BeppoSAX shows that current source flux in hard X-rays is close to its maximum observed in 1990 and 1997. The averaged fluxes are equal ... | 2003-08-30 07:42:00 | radio,infra-red,x-ray,gamma ray,binary,black hole,request for observations |
186 | Prompt Shutoff of XTE J1739-302 | D. M. Smith (UCSC), C. B. Markwardt and J. H. Swank (NASA/GSFC), W. A. Heindl (UCSD) | RXTE was pointed directly to XTE J1739-302 between 06:06 and 06:58 UT on 28 August. Shortly afterward, a regularly-scheduled RXTE scan of the Galactic Bulge (C. Markwardt, P.I.) was performed. Neither observation detected XTE J1739-302. Precise upper limit calculations are not yet available but should be in the neighbo... | 2003-08-30 13:16:00 | x-ray,gamma ray,binary,transient |
187 | Hard X-ray Outburst from Rapid Burster MXB1730-335 | R. Sunyaev (IKI, Moscow/MPA, Garching), S. Molkov (IKI, Moscow), A. Lutovinov (IKI, Moscow) | We report a detection of the outburst from MXB1730-335 (Rapid Burster) with the INTEGRAL observatory during the deep observation of the Galactic Center field. The source was detected on Aug 28, 2003 with a flux of ~30 mCrab in the 15-40 keV energy band. The observations on Aug 29 UT14:40 - Aug 30 UT11:30, 2003 showed t... | 2003-08-31 07:53:00 | x-ray,gamma ray,binary,neutron star,star,request for observations |
188 | XTE J1810-197 is Likely an Anomalous X-ray Pulsar | C. B. Markwardt (U. Maryland & GSFC), S. Ransom (McGill), P. Woods (NSSTC), A. Ibrahim (GWU & GSFC), V. Kaspi (McGill), C. Kouveliotou (NSSTC), M. Roberts (McGill) & J. Swank (GSFC) | The recently discovered pulsar, XTE J1810-197, now also known as CXOU J180951.1-194351, AX J1809.8-1943 and 1RXS J180951.5-194345 (IAUC 8168 , IAUC 8190 ), has been observed by the RXTE PCA from 2002 to present. These observations include pointings of other targets which included XTE J1810-197 in the field of view, gal... | 2003-09-11 10:02:00 | x-ray,gamma ray,binary,neutron star,pulsar,soft gamma-ray repeater,star,transient,a comment |
189 | Reactivation of IGR J17464-3213 in hard X-rays | S. A.Grebenev (IKI, Moscow), A. A.Lutovinov (IKI, Moscow), R. A.Sunyaev (IKI, Moscow/MPA, Garching) | On the basis of recent INTEGRAL observations we report on reactivation of the Galactic black hole candidate IGR J17464-3213 (=H1743-322) in the hard X-ray band.
The source flared up as an X-ray nova in the end of March (ATEL #132) remains bright in soft E < 15 keV X-rays (ATEL #180). We regularly detected it with the ... | 2003-09-16 21:58:00 | x-ray,gamma ray,black hole,nova,transient,variables |
190 | New source IGR J17544-2619 discovered with INTEGRAL | R. A.Sunyaev (IKI, Moscow; MPA, Garching), S. A.Grebenev (IKI, Moscow), A. A.Lutovinov (IKI, Moscow), J. Rodriguez (CEA/SAp, Saclay), S. Mereghetti (IASF, Milano), D. Gotz (IASF, Milano), T. Courvoisier (ISDC, Versoix) and the shift team | We report the discovery of a new transient source, IGR J17544-2619, with the IBIS/ISGRI detector on board the INTEGRAL observatory. The source position is RA=17h54.4m, DEC= -26d19' (equinox 2000, position uncertainty around 2'). The source was detected during an observation of the Galactic Center field on September 17,... | 2003-09-17 23:15:00 | radio,infra-red,x-ray,binary,black hole,neutron star,star,transient,request for observations |
191 | IGR J17544-2619 might be 1RXS J175428.3-262035 | Rudy Wijnands (University of St Andrews) | Using the ROSAT All-Sky Survey Faint Source Catalogue (Voges et al. 2000, IAUC # 7432 ), it was found that the ROSAT source 1RXS J175428.3-262035 is located at the edge of the INTEGRAL error circle of the new transient IGR J17544-2619 (ATEL #190). The PSPC position listed in the Catalogue is 17h54m28.30s, -26 20' 35" (... | 2003-09-18 18:39:00 | radio,infra-red,x-ray,black hole,neutron star,star,transient,request for observations |
192 | New outburst of IGR J17544-2619 | S. A.Grebenev (IKI, Moscow), A. A.Lutovinov (IKI, Moscow), R. A.Sunyaev (IKI, Moscow; MPA, Garching) | The source IGR J17544-2619 reported in ATEL #190 was again detected in outburst during the next set of INTEGRAL observations. This outburst began on September 17, at 6h UTC and lasted 8 hours. The profile was complex and consisted of two broad peaks. The flux measured with ISGRI/IBIS in the 18-25 keV band was equal to ... | 2003-09-19 05:09:00 | radio,infra-red,optical,x-ray,binary,black hole,neutron star,star,transient |
193 | XMM-Newton observation of XTE J1810-197 | A. Tiengo (IASF Milano), S. Mereghetti (IASF Milano) | The candidate Anomalous X-ray Pulsar XTE J1810-197 (ATEL #188) has been observed with XMM-Newton on September 8, 2003 from 13:30 to 16 UT and from 17 to 17:30 UT.
The 0.6-10 keV spectrum obtained with the EPIC PN camera is inconsistent with a single power law. The spectrum can be fit by a two components model consisti... | 2003-09-19 23:25:00 | x-ray,neutron star,pulsar,star,request for observations |
194 | Possible infrared/optical counterparts of IGR J17544-2619 | J. Rodriguez (CEA/SAp Saclay) | J. Rodriguez, CEA/SAp, Saclay & ISDC, Versoix; L. Foschini, IASF/CNR, Bologna; T. Courvoisier, ISDC Versoix; and D. Hannikainen, Univ. of Helsinki, report on the 2MASS archival data analyses of the field of IGR J17544-2619 (Atel #190, IAUC # 8202 ). A clear source is detected in the 2MASS All-Sky Quicklook image archiv... | 2003-09-20 20:01:00 | infra-red,optical,binary,transient,request for observations |
195 | Optical Observations of XTE J1810-197 and SGR 1806-20 | Solen Balman (METU, Ankara), Samar Safi-Harb (U. of Manitoba, Canada), Alaa I. Ibrahim (NASA/GSFC & GWU), Jean H. Swank (NASA/GSFC), Craig Markwardt (NASA/GSFC & UMD) | We have observed the Chandra error boxes of the newly discovered Anomalous X-ray Pulsar candidate XTE J1810-197 (also known as CXOU J180951.1-194351; IAUC 8168 , IAUC 8190 ) and the Soft Gamma Repeater SGR 1806-20 (Kaplan et al. 2002) with the 1.5 m Russian-Turkish Telescope, RTT150 (Antalya, Turkey) on 2003 September ... | 2003-09-27 05:19:00 | optical,x-ray,gamma ray,magnetar,neutron star,pulsar,soft gamma-ray repeater,star |
196 | GX 339-4 in a very low luminosity state | Elena Gallo, Rob Fender (U Amsterdam) & Stephane Corbel (U Paris VII & CEA Saclay) | A 30 ksec Chandra ACIS-S observation on MJD 52911 reveals the black hole X-ray binary GX 339-4 to have entered a very low luminosity state following a more than 2-year-long outburst period (ATEL #85, #95, #107, #120). The X-ray spectrum is well fitted by an absorbed power-law with photon index 2+/-0.2 and absorption co... | 2003-10-03 23:48:00 | radio,x-ray,binary,black hole,transient |
197 | New Outburst in Recurrent X-ray transient (MX0656-072 = XTEJ0658-073) | Ron Remillard (MIT) and Frank Marshall (GSFC), for the RXTE ASM team | The soft X-ray transient, "MX0656-072", has begun a new X-ray outburst. Observations with the RXTE All-Sky Monitor reveal a slowly increasing flux during the last 7 days, reaching a value of 75 (5) mCrab at 2-12 keV on 2003 October 18. The ASM position is consistent with the 3' error box (J2000 center in degrees: 104.6... | 2003-10-19 02:29:00 | radio,optical,x-ray,binary,transient,request for observations |
198 | H 1743-322 (= IGR J17464-3213) Transition to the Hard State | John A. Tomsick (UC San Diego) & Emrah Kalemci (UC Berkeley) | The black hole candidate X-ray transient H 1743-322 (= IGR J1746-3213 = XTE J17464-3213) that began its current outburst on 2003 March 21 (ATEL#132) appears to be in the process of making a transition to the hard state. We have been monitoring this source several times per week with RXTE since 2003 Sept. 24 UT, a coupl... | 2003-10-21 04:23:00 | radio,x-ray,black hole,transient,request for observations |
199 | XTEJ0658-073 (=MX0656-072) is a Pulsar | Ed Morgan(MIT), Ron Remillard(MIT) and Jean Swank(GSFC) for the RXTE team | Observations of XTEJ0658-073 with the RXTE PCA on 2003 October 19-20 indicate that the source is a pulsar with an spin period of 160.7 s. The pulse fraction is 15% (rms) at 3-30 keV. The intensity continues to rise, as the ASM measures 120 mCrab (2-12 keV) on October 21. The PCA spectrum and the ASM hardness ratio (HR2... | 2003-10-22 03:09:00 | x-ray,neutron star,pulsar,star,transient |
200 | Cyclotron Line in XTE J0658-073 | William Heindl (UCSD/CASS), Wayne Coburn (UCB/SSL), Ingo Kreykenbohm (IAAT/ISDC), Joern Wilms (IAAT) | Joint RXTE PCA and HEXTE spectral analysis of the 2003 October 20 observation of the 160.7 second accreting pulsar XTE J0658-073 (Morgan et al. 2003, ATEL #199) reveals a strong cyclotron line at ~35keV. We fit a range of continuum models typical of accreting pulsars to the pulse phase averaged spectra. In all cases, s... | 2003-10-24 04:19:00 | optical,x-ray,neutron star,pulsar,star,transient |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.