TITLE: GCN CIRCULAR NUMBER: 6996 SUBJECT: GRB 071025, Swift-BAT refined analysis DATE: 07/10/25 11:29:48 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), C. Pagani (PSU), D. Palmer (LANL), A. Parsons (GSFC), 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 T-239 to T+422 sec from the recent telemetry downlink, we report further analysis of BAT GRB 071025 (trigger #295301) (Pagani, et al., GCN Circ. 6986). The BAT ground-calculated position is RA, Dec = 355.065, 31.784 deg, which is RA(J2000) = 23h 40m 15.6s Dec(J2000) = 31d 47' 3" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 48%. The mask-weighted light curve shows a broad peak composed of several overlapping subpeaks. It starts at ~T+0 sec, peaks around T+90 sec, and slowly decays out to at least T+422 sec. Because of an observing constraint, the s/c had to slew off the burst location, and so we do not have any information on the continuation of the emission beyond the T+422 sec limit. T90 (15-350 keV) is at least 109 +- 2 sec (estimated error including systematics). The time-averaged spectrum from T+38.5 to T+193.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.79 +- 0.05. The fluence in the 15-150 keV band is 6.5 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+80.17 sec in the 15-150 keV band is 1.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.