//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6858 SUBJECT: GRB 071006 Swift-BAT detection of a burst DATE: 07/10/10 02:18:52 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (CRESST/NASA/GSFC) for the Swift-BAT team At 06:41:40 UT on October 6, the Swift Burst Alert Telescope (BAT) triggered on GRB 071006. The burst began just before a preplanned slew, and no source was found automatically onboard. A source was found during later ground analysis, at a location of RA, Dec 335.282, -23.154, which is RA(J2000) = 22h 21m 07s Dec(J2000) = -23d 09' 14" with an uncertainty of 2 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows two small peaks on top of a gradual rise to a large peak at T+32 sec. The total duration is about 80 sec. The spectrum appears to be of average hardness for a long GRB. Because the burst was detected on the ground, there are no prompt XRT data. We have requested a TOO to observe this burst on October 10. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6867 SUBJECT: Konus-Wind observation of GRB 071006 DATE: 07/10/10 13:38:48 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline on behalf of the Konus-Wind team report: The long GRB 071006 (Cummings, GCN 6858) triggered Konus-Wind at T0=24133.617 s UT (06:42:13.617). The burst started at T-T0 ~35 s and had a duration of ~60 s. As observed by Konus-Wind the burst had a fluence of 2.08(-1.25, +0.11)x10^-5 erg/cm2, and a 256-ms peak flux measured from T0+1.264 s of 2.66(-1.51, +0.45)x10^-6 erg/cm2/s (both in the 20 keV - 2 MeV energy range). The spectrum integrated over the main peak (from T0 to T0+8.448 s) is well fitted (in the 20 keV - 2 MeV range) by a power law with exponential cutoff model: dN/dE ~ E^(-alpha)*exp(-E*(2-alpha)/Ep) with alpha = 0.84(-0.26, +0.22) and Ep = 334(-61, +95) keV (chi2 = 62.2/60 dof). The fluence of this part is 8.52(-4.63, +0.47)x10^-6 erg/cm2. All the quoted errors are at the 90% confidence level. The Konus-Wind light curve of this GRB is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB071006_T24133/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6875 SUBJECT: GRB 071006, Swift-BAT refined analysis DATE: 07/10/11 01:00:47 GMT FROM: Craig Markwardt at NASA/GSFC/UMD C. B. Markwardt (GSFC/UMD), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), D. Palmer (LANL), P. Romano (Univ. Bicocca & INAF-OAB), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T0 to T+13 sec (which covers only one of the minor peaks in the burst), we report further analysis of BAT GRB 071006 (trigger #293250) (Cummings, et al., GCN Circ. 6858). The best BAT position is RA, Dec = 335.294 -23.147 deg which is RA(J2000) = 22h 21m 10.4s Dec(J2000) = -23d 08' 47" with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 6%. We do not have a mask-weighted light curve for this event. The raw light curve based on the whole detector rate shows 3 peaks of increasing amplitude, the two minor peaks at T-2 and T+10 sec, and the main peak at T+32 sec. The two smaller peaks are each about 6 seconds long and the larger about 30 seconds long. All the peaks are roughly symmetric. T90 is 50 +- 10 seconds (estimated error including systematics). The time-averaged spectrum from T+0 to T+13 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.75 +- 0.21. The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-7 erg/cm2. The 1-sec peak photon flux occurs where no event data is available. By comparing the portions of the raw light curve and the mask-weighted light curve that do overlap, we extrapolate a peak flux of 13 +- 3 ph/cm2/sec in the 15-150 keV band. Similarly, we extrapolate a total fluence of 1.0 +- 0.3 x 10^-6 erg/cm2. All the quoted errors are at the 90% confidence level.