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.