TITLE: GCN CIRCULAR NUMBER: 8082 SUBJECT: GRB 080810, Swift-BAT refined analysis DATE: 08/08/10 16:20:08 GMT FROM: Scott Barthelmy at NASA/GSFC T. Sakamoto (GSFC/UMBC), 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), K. McLean (GSFC/UMD), K. L. Page (U Leicester), D. Palmer (LANL), 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+381 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080810 (trigger #319584) (Page, et al., GCN Circ. 8080). The BAT ground-calculated position is RA, Dec = 356.783, 0.310 deg which is RA(J2000) = 23h 47m 08.0s Dec(J2000) = +00d 18' 35.1" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 68%. The mask-weighted light curve shows a cluster of overlapping peaks starting at ~T-20, the tallest at T+25 sec, and ending at ~T+120 sec. T90 (15-350 keV) is 106 +- 5 sec (estimated error including systematics). The time-averaged spectrum from T-21.2 to T+111.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.34 +- 0.06. The fluence in the 15-150 keV band is 4.6 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+24.68 sec in the 15-150 keV band is 2.0 +- 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/319584/BA/