TITLE: GCN CIRCULAR NUMBER: 10891 SUBJECT: GRB 100625A: Swift-BAT refined analysis DATE: 10/06/26 14:34:54 GMT FROM: Michael Stamatikos at OSU/GSFC S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), S. T. Holland (CRESST/USRA/GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU/NASA/GSFC), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+500 sec from the recent telemetry downlink, we report further analysis of BAT GRB 100625A (trigger #425647) (Holland, et al., GCN Circ. 10884). The BAT ground-calculated position is RA, Dec = 15.796, -39.091 deg which is RA(J2000) = 01h 03m 11.1s Dec(J2000) = -39d 05' 29.3" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows two overlapping peaks starting at ~T-0.1 sec, peaking at ~T+0.1 and T+0.2 sec, and ending at ~T+0.3 sec. There is a weak soft tail out to ~T+30 sec. T90 (15-350 keV) is 0.33 +- 0.03 sec (estimated error including systematics). The time-averaged spectrum from T-0.1 to T+0.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.90 +- 0.10. The fluence in the 15-150 keV band is 2.3 +- 0.2 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T-0.37 sec in the 15-150 keV band is 2.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/425647/BA/