//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8314 SUBJECT: GRB 081003: A long GRB discovered by INTEGRAL DATE: 08/10/03 14:53:11 GMT FROM: Sandro Mereghetti at IASF/CNR S.Mereghetti, A.Paizis (IASF-Milano), D.Gotz (CEA-Saclay), F. Fontani, V.Beckmann, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A GRB lasting about 30 s has been detected by IBAS in IBIS/ISGRI data at 13:46:12 UT of October 3. The coordinates (J2000) are: RA = 262.3758 [degrees] DEC= 16.566 [degrees] with an uncertainty of 2 arcmin (90% c.l.). A preliminary analysis gives a peak flux in the 20-200 keV range of about 0.3 ph/cmq/s (1-s integration time) and a fluence over the same energy range of about 4x10e-7 erg/cmq. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8317 SUBJECT: GRB 081003B: a long GRB detected with INTEGRAL DATE: 08/10/03 22:08:37 GMT FROM: Diego Gotz at CEA D.Gotz (CEA-Saclay), S.Mereghetti, A.Paizis (IASF-Milano), F. Fontani, V.Beckmann, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A GRB lasting about 30 s has been detected by IBAS in IBIS/ISGRI data at 20:48:08 UT of October 3. The coordinates (J2000) are: RA = 285.0256 [degrees] DEC= +16.6914[degrees] with an uncertainty of 1.5 arcmin (90% c.l.). A preliminary analysis gives a peak flux in the 20-200 keV range of about 3 ph/cmq/s (1-s integration time) and a fluence over the same energy range of about 6x10e-6 erg/cmq. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8319 SUBJECT: GRB 081003A: Swift-XRT Team position and analysis DATE: 08/10/03 23:31:33 GMT FROM: Kim Page at U.of Leicester K.L. Page, A.P. Beardmore (U. Leicester) and H.A. Krimm (CRESST/GSFC/USRA) report on behalf of the Swift-XRT team: Swift began observing the field of the INTEGRAL GRB 081003A (Mereghetti et al., GCN Circ. 8314) 7.6 ks after the trigger. In 1.8 ks of Photon Counting mode data, we detect a single source within the INTEGRAL error circle at a position of RA, Dec = 262.39082, 16.57103, which is equivalent to RA(J2000): 17 29 33.80 Dec(J2000): +16 34 15.70 with an uncertainty of 3.9 arcsec (radius, 90% containment). The source has a count rate of ~0.026 during this observation. The spectrum of the source can be fitted by an absorbed power-law, with Gamma = 3.6 +1.6/-1.2 and NH = (7 +6/-4)x10^21 cm^-2, compared to the Galctic value of 6.67x10^20 cm^-2. It is not possible to determine whether this source is fading given the current statistics. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8320 SUBJECT: GRB081003B: Optical limits from Spain DATE: 08/10/03 23:38:44 GMT FROM: Martin Jelinek at Inst.Astrophys.Andalucia,Granada Martin Jelinek, Javier Gorosabel, Fran Aceituno, Alberto Castro-Tirado (IAA CSIC Granada) and Antonio de Ugarte Postigo (ESO Santiago) report on behalf of a larger collaboration: We observed the error box of the INTEGRAL GRB081003B (Gotz et al., GCN8317) with the 30cm BOOTES-1B in El Arenosillo and with the 1.5m telescope at Observatorio Sierra Nevada. BOOTES started obtaining unfiltered images at 20:48:49UT (41s after the GRB trigeer), single images have a detection limit of ~14 mag. The combination of the first 32 images with an exposure mean time of 80s after the GRB has a limit of ~17.6mag (calibrated against GSC2). Neither shows any new sources within the GRB errorbox. The 1.5m telescope took a single I-band 300s exposure starting at 21:21:59 (mid exposure ~26.5 min after the GRB), this image does not reveal any new source in comparison with DSS-IR, but goes deeper. Further comparison image would be needed to exploit full potential of this observation. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8323 SUBJECT: GRB 081003A: OSN optical observations DATE: 08/10/04 06:08:03 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia A. de Ugarte Postigo (ESO, Santiago), F. J. Aceituno, M. Jelínek, J. Gorosabel and A.J. Castro-Tirado (IAA-CSIC, Granada) on behalf of a larger collaboration report: "We have observed the field of GRB 081003A detected by INTEGRAL (Mereghetti et al. GCN 8314) with the 1.5m OSN telescope at Sierra Nevada Observatory (Granada, Spain). The observations consisted of 6x300s in I-band, 2x300s in R-band and 2x300s in V-band (5.07, 6.17 and 5.31h after the burst trigger respectively). We do not detect any new optical source within the Swift/XRT error box (Page et al. GCN 8319) down to 3-sigma limiting magnitudes of I > 22.0 and R > 22.5. We note, however that there could be a marginal object (with low S/N significance in the I-band frame) at coordinates (J2000): R.A.: 17:29:33.85, Dec.: +16:34:14.1 (+/-0.7"), consistent with the XRT error box. Deeper observations would be needed in order to confirm the reality of this source." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8324 SUBJECT: GRB 081003B: Swift-XRT upper limit DATE: 08/10/04 19:23:35 GMT FROM: Kim Page at U.of Leicester K.L. Page (U. Leicester) & C.B. Markwardt (CRESST/GSFC/UMD) report on behalf of the Swift-XRT team: Swift-XRT performed a Target of Opportunity observation of the INTEGRAL GRB 081003B (Gotz et al., GCN Circ. 8317), starting ~29 ks after the trigger. No source is detected within or near to the INTEGRAL error circle during a 3.6 ks Photon Counting mode observation. The 3-sigma upper limit on the count rate is 0.002 count s^-1, corresponding to an approximate observed 0.3-10 keV flux of 1x10^-13 erg cm^-2 s^-1 (using a standard counts to flux conversion factor). This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8326 SUBJECT: GRB 081003B: TAROT Calern observatory optical observations DATE: 08/10/06 10:38:46 GMT FROM: Alain Klotz at CESR-CNRS Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report: We imaged the field of GRB 081003 detected by INTEGRAL (trigger 5361) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. 2008-10-03T20:48:45.809 The observations started 29.7s after the GRB trigger (7s after the notice) when the gamma emission was still active. The elevation of the field decreased from 41 degrees above horizon and weather conditions were good. The date of trigger : t0 = 2008-10-03T20:48:16.09 The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We do not detect any OT at the position provived by Gotz (GCNC 8317) with a limiting magnitude of: t0+29.7s to t0+89.7s : R > 16.9 The second image is 30.0s exposure in tracking mode: t0+97.0s to t0+127.0s : R > 17.4 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. N.B. Galactic coordinates are lon= 48.80 lat= +5.63 and the galactic extinction in R band is 2.0 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8329 SUBJECT: GRB081003C: GLAST Burst Monitor detection DATE: 08/10/06 23:54:14 GMT FROM: Alexander van der Horst at NASA/MSFC A.J. van der Horst (NASA/ORAU) reports on behalf of the Fermi GBM Team: "At 15:27:17 UT on 3 October 2008, the Fermi GBM triggered and located GRB 081003C (trigger 244740438 / 081003.644). The on-ground calculated location, using the GBM trigger data, is RA = 270.0, Dec = +20.9 (J2000 degrees, equivalent to 18h 00m, +20d 54'), with an uncertainty of 3.7 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight is 48 degrees. This GRB has several peaks, with T90 (50-300 keV) = 67 s and T50 (50-300 keV) = 31 s. The time-averaged spectrum (8-1000 keV) from T0-4 to T0+51 s is best fit by a power law with index = -1.41 +/- 0.06. The fluence (50-300 keV) is 5.4E-6 erg/cm^2. The spectral analysis results presented above are preliminary; the final results will be published in the GBM GRB Catalog." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8329 SUBJECT: GRB081003C: GLAST Burst Monitor detection DATE: 08/10/06 23:54:14 GMT FROM: Alexander van der Horst at NASA/MSFC A.J. van der Horst (NASA/ORAU) reports on behalf of the Fermi GBM Team: "At 15:27:17 UT on 3 October 2008, the Fermi GBM triggered and located GRB 081003C (trigger 244740438 / 081003.644). The on-ground calculated location, using the GBM trigger data, is RA = 270.0, Dec = +20.9 (J2000 degrees, equivalent to 18h 00m, +20d 54'), with an uncertainty of 3.7 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight is 48 degrees. This GRB has several peaks, with T90 (50-300 keV) = 67 s and T50 (50-300 keV) = 31 s. The time-averaged spectrum (8-1000 keV) from T0-4 to T0+51 s is best fit by a power law with index = -1.41 +/- 0.06. The fluence (50-300 keV) is 5.4E-6 erg/cm^2. The spectral analysis results presented above are preliminary; the final results will be published in the GBM GRB Catalog."