TITLE: GCN CIRCULAR NUMBER: 8468 SUBJECT: GRB 081102: Swift-BAT refined analysis DATE: 08/11/03 13:22:28 GMT FROM: Scott Barthelmy at NASA/GSFC E. E. Fenimore (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 081102 (trigger #333427) (Ukwatta, et al., GCN Circ. 8462). The BAT ground-calculated position is RA, Dec = 331.178, 52.991 deg, which is RA(J2000) = 22h 04m 42.6s Dec(J2000) = +52d 59' 27.7" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 36%. The mask-weighted light curve shows two overlapping peaks, the first starting at ~T-20 sec, peaking at ~T-15 sec, and hitting a minimum between the two peaks at ~T-7 sec. The second peak peaks at ~T+1 sec, and returns to background at ~T+90 sec. T90 (15-350 keV) is 63 +- 16 sec (estimated error including systematics). The time-averaged spectrum from T-20.2 to T+62.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.73 +- 0.13. The fluence in the 15-150 keV band is 2.3 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.08 sec in the 15-150 keV band is 1.4 +- 0.3 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/333427/BA/