TITLE: GCN CIRCULAR NUMBER: 6889 SUBJECT: GRB 071011, Swift-BAT refined analysis DATE: 07/10/11 18:19:12 GMT FROM: Scott Barthelmy at NASA/GSFC T. Sakamoto (GSFC/UMBC), S.D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), F.E. Marshall (GSFC), D. Palmer (LANL), 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 T-119 to T+183 sec from the recent telemetry downlink, we report further analysis of BAT GRB 071011 (trigger #293924) (Marshall, et al., GCN Circ. 6882). The BAT ground-calculated position is RA, Dec = 8.395, 61.132 deg which is RA(J2000) = 0h 33m 34.8s Dec(J2000) = 61d 07' 57" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 37%. The mask-weighted light curve shows two roughly symmetric peaks. The first starts at ~T-10 sec, peaks at ~T+1 sec, and reachs a minimum at ~T+30 sec. The second picks up at the minimum at ~T+30 sec, peaks at ~T+46 sec, and ends at ~T+90 sec. T90 (15-350 keV) is 61 +- 1 sec (estimated error including systematics). The time-averaged spectrum from T-9.5 to T+63.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.41 +- 0.12. The fluence in the 15-150 keV band is 2.2 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+45.98 sec in the 15-150 keV band is 1.7 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.