TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5403 SUBJECT: GRB 060805: Swift-BAT Refined Analysis DATE: 06/08/05 16:28:08 GMT FROM: Hans Krimm at NASA-GSFC L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), M. Koss (GSFC/UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/JSPS/USRA), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), on behalf of the Swift-BAT team: Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 060805 (trigger #222683) (Ziaeepour, et al., GCN Circ. 5398). The BAT ground-calculated position is (RA,Dec) = 220.925, 12.576 deg {14h 43m 41.9s, 12d 34' 35.0"} (J2000) +- 2.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 96%. The currently available event data record has several gaps, most significantly from T+14.3 to T+19.5 sec. Based on the available data, the mask weighted light curve shows a single peak with a roughly square profile and a duration of ~6 sec. Emission was only seen below 100 keV, which is consistent with the very soft spectrum found. T90 (15-350 keV) is 5.4 +- 0.5 sec (estimated error including systematics). The time-averaged spectrum from T-1.6 to T+4.7 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.23 +- 0.42. The fluence in the 15-150 keV band is 7.4 +- 2.0 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T+0.71 sec in the 15-150 keV band is 0.3 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.