//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7030 SUBJECT: GRB 071101: Swift detection of a burst DATE: 07/11/01 18:14:24 GMT FROM: Scott Barthelmy at NASA/GSFC S. McBreen (MPE), S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), O. Godet (U Leicester), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (GSFC/USRA), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), C. Pagani (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL), A. M. Parsons (GSFC), P. Romano (Univ. Bicocca & INAF-OAB), T. Sakamoto (NASA/UMBC), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester), E. Troja (INAF-IASFPA), T. N. Ukwatta (GSFC/GWU), D. E. Vanden Berk (PSU) and S. D. Vergani (DIAS-DCU) report on behalf of the Swift Team: At 17:53:46 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 071101 (trigger=295779). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 48.194, +62.473 which is RA(J2000) = 03h 12m 46s Dec(J2000) = +62d 28' 24" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 3 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~1 sec after the trigger. The XRT began taking data at 17:58:29 UT, 283 seconds after the BAT trigger. The XRT on-board centroid algorithm did not find a source in the image and no prompt position is available. We are waiting for down-linked data to detect and determine a position for the source. UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 82 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error circle. The typical 3-sigma upper limit has been about 18.5 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the large, but uncertain extinction expected. Burst Advocate for this burst is S. McBreen (smcbreen AT mpe.mpg.de). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7031 SUBJECT: GRB 071101: a nearby galaxy DATE: 07/11/01 19:52:45 GMT FROM: Eran Ofek at Tel Aviv U. E. Ofek (Caltech) reports: I note the presence of a 2MASS-cataloged galaxy, 2MASX J03124721+6231391, just outside the BAT localization region for the short-duration burst GRB 071101 (McBreen et al. 2007; GCN 7030). The galaxy is located 3.3 arcmin. from the nominal BAT localization. By analyzing all the Swift BAT and XRT observed GRB positions, I find that the probability that the BAT localization is off by more than 3.3 arcmin is about 3%. The galaxy J2000.0 position is: 03:12:47.2 +62:31:39, and it has a total K-band magnitude of 11.4. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7033 SUBJECT: GRB071101 LOAO B,V,R,I observation DATE: 07/11/02 05:34:05 GMT FROM: Yuji Urata at Saitama U I. Lee, M. Im (Seoul National University), and Y. Urata (Saitama U/ASIAA) on behalf of the EAFON team: "Using the Mt. Lemmon (Arizona, US) 1.0m telescope operated by the Korea Astronomy and Space Science Institute, we have imaged the GRB071101 field (McBreen et al. GCN7030). The observation started at UT 01:59 on Nov 02 (8 hours after the GRB). These images obtained in B,V,R,I with 300 sec exposure show no new source. The upper limit derived from USNO-B1.0 stars is 21th mag in R-band." This message may be cited. We acknowledge the help of the LOAO operators, J.H. Yoon, for this observation. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7034 SUBJECT: GRB 071101: Swift XRT position DATE: 07/11/02 06:21:15 GMT FROM: Claudio Pagani at PSU/Swift-XRT C. Pagani (PSU) reports on behalf of the Swift-XRT team: Swift XRT observed the GRB 071101 (trigger=295779, McBreen et al., GCN Circ. 7030) beginning 85 s after the BAT trigger. In the first 13 ks of Photon Counting mode data a faint X-ray source is detected at the position RA,Dec = 48.1772, +62.5002 deg, equivalent to: RA(J2000) = 03h 12m 42.53s Dec(J2000)= +62d 30' 00.7" with an error of radius 7 arcseconds (90%, including boresight uncertainties). This is 102 arcseconds from the BAT position (GCN Circ. 7030) and 103 arcseconds from the 2MASS-cataloged galaxy, 2MASX J03124721+6231391 reported by Ofek (GCN Circ. 7031). Further analysis will be reported in a subsequent circular. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7035 SUBJECT: GRB 071101: TAROT Calern observatory optical observations DATE: 07/11/02 07:27:06 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 071101 detected by SWIFT (trigger 295779) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 39.4s after the GRB trigger (7.1s after the notice). The elevation of the field increased from from 36 degrees above horizon and weather conditions were good. Images were acquired with no filter. The date of trigger : t0 = 2007-11-01T17:53:46.752 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 XRT location defined by Pagani et al. GCN Circ. 7034) with a limiting magnitude of: t0+39.4s to t0+99.4s : R > 16.3 The second image is 30.0s exposure in tracking mode: t0+106.4s to t0+136.4s : R > 17.5 We co-added a series of exposures: t0+106.4s to t0+393.6s : R > 18.4 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. N.B. Galactic coordinates are lon=138.4726 lat= +3.9459 and the galactic extinction in R band is about 4.0 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7037 SUBJECT: GRB071101: Optical and NIR upper limits by KANATA DATE: 07/11/02 13:46:56 GMT FROM: Makoto Uemura at Hiroshima U M. Uemura, A. Arai, and T. Uehara (Hiroshima Univ.), report on behalf of the KANATA GRB team: We performed optical-NIR observations of the field of GRB 071101 (GCN Circ. 7030) with TRISPEC attached to the "KANATA" 1.5-m telescope. Our images cover about 70% of the south region of the BAT errorbox, in which the nearby galaxy reported in GCN Circ. 7031 is not included and the region of the XRT error circle (GCN Circ. 7034) is included. No fading source or afterglow candidate can significantly be detected in the XRT error circle. Upper limits of magnitude were estimated from neighbor USNO B1.0 stars and 2MASS sources, shown below: time(UT) time after the burst lim. mag. exposure_time 1 Nov. 2007 (sec) (sec) 17:57:36 229 19.7(V) 30 17:57:33 226 17.0(J) 24 17:57:27 220 14.8(Ks) 12 18:16:25 1358 20.8(V) 123 18:16:24 1357 18.0(J) 120 18:16:16 1349 15.5(Ks) 108 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7038 SUBJECT: GRB 071101: Swift-XRT Team refined analysis DATE: 07/11/02 14:05:24 GMT FROM: Olivier Godet at U.of Leicester O. Godet, K.L. Page, A.P. Beardmore, J.P. Osborne (U. Leicester), S. McBreen (MPE) on behalf of the Swift-XRT team: We analysed 15.5ks of Photon Counting data for GRB 071101 (McBreen et al. GCN Circ. 7030). Using Swift-XRT PC data, Pagani (GCN Circ. 7034) reported a faint X-ray source in the BAT error circle. The X-ray light-curve for this source can be fitted by a power-law from T+85s to T+4.1e4s, with an initial decay index of 0.9 ± 0.3. So, this source is the X-ray afterglow of GRB 071101. The Photon Counting spectrum can modelled as an absorbed power-law, with Gamma = 2.9 +2.5/-1.7 and a total absorbing column of NH = (2.0 +2.8/-1.6)e22 cm-2. The Galactic value is 5.7e21 cm-2 in the direction of the burst. The 1-10 keV observed (unabsorbed) flux during this time is 1.4e-13(3.2e-13) erg cm-2 s-1. Assuming the source continues to decay with the same decay index of 0.9, we predict an XRT count rate of 6.4e-4 counts/s at T+24 hours, which corresponds to an observed 1-10keV flux of 6.8E-14 ergs cm-2 s-1. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7039 SUBJECT: GRB 071101, Swift-BAT refined analysis DATE: 07/11/02 14:14:12 GMT FROM: Scott Barthelmy at NASA/GSFC T. Ukwatta (GWU) S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), S. McBreen (MPE), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 071101 (trigger #295779) (McBreen, et al., GCN Circ. 7030). The BAT ground-calculated position is RA, Dec = 48.179, 62.524 deg, which is RA(J2000) = 03h 12m 42.9s Dec(J2000) = 62d 31' 27" with an uncertainty of 2.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 99%. The mask-weighted light curve shows a single peak starting at a low level at ~T-20, then spiking at T+1 sec, and ending at ~T+10 sec. T90 (15-350 keV) is 9.0 +- 1.0 sec (estimated error including systematics). The time-averaged spectrum from T-1.9 to T+6.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.25 +- 0.58. The fluence in the 15-150 keV band is 7.6 +- 2.6 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T+0.07 sec in the 15-150 keV band is 0.4 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.