TITLE: GCN CIRCULAR NUMBER: 8187 SUBJECT: GRB 080905A, Swift-BAT refined analysis DATE: 08/09/06 16:51:33 GMT FROM: Scott Barthelmy at NASA/GSFC J. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), C. Pagani (PSU), T. Sakamoto (GSFC/UMBC), G. Sato (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+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080905A (trigger #323870) (Pagani, et al., GCN Circ. 8180). The BAT ground-calculated position is RA, Dec = 287.663, -18.865 deg, which is RA(J2000) = 19h 10m 39.1s Dec(J2000) = -18d 51' 55.4" with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 56%. The mask-weighted light curve shows three peaks; the first two are partially overlapping, starting at T+0.0 and ending at ~T+0.4 sec. The third peak starts at ~T+0.6 and ends at ~T+1.3 sec. T90 (15-350 keV) is 1.0 +- 0.1 sec (estimated error including systematics). The time-averaged spectrum from T+0.0 to T+1.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.85 +- 0.24. The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.04 sec in the 15-150 keV band is 1.3 +- 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/323870/BA/