TITLE: GCN CIRCULAR NUMBER: 8188 SUBJECT: GRB 080905B, Swift-BAT refined analysis DATE: 08/09/06 17:03:34 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), M. C. Stroh (PSU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+903 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080905B (trigger #323898) (Stroh, et al., GCN Circ. 8182). The BAT ground-calculated position is RA, Dec = 301.746, -62.568 deg, which is RA(J2000) = 20h 06m 59.1s Dec(J2000) = -62d 34' 03.8" with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 37%. The mask-weighted light curve shows two clusters pf peaks. The first starts at ~T-2 sec and almost returns to background levels as the second cluster starts around T+40 sec. The second cluster returns to background at ~T+220 sec. T90 (15-350 keV) is 128 +- 16 sec (estimated error including systematics). The time-averaged spectrum from T-15.5 to T+128.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.78 +- 0.15. The fluence in the 15-150 keV band is 1.8 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+8.02 sec in the 15-150 keV band is 0.5 +- 0.1 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/323898/BA/