TITLE: GCN CIRCULAR NUMBER: 13007 SUBJECT: GRB 120305A: Swift-BAT refined analysis DATE: 12/03/06 00:10:00 GMT FROM: Scott Barthelmy at NASA/GSFC D. M. Palmer (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), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), G. Stratta (ASDC), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from recent telemetry downlinks, we report further analysis of BAT GRB 120305A (trigger #516997) (Stratta, et al., GCN Circ. 13004). The BAT ground-calculated position is RA, Dec = 47.549, 28.495 deg which is RA(J2000) = 03h 10m 11.8s Dec(J2000) = +28d 29' 41.2" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 92%. The mask-weighted light curve shows a single FRED-like spike starting at ~T+0.00 sec, peaking at ~T+0.02 sec, and returning to baseline at ~T+0.20 sec. At the ~2-sigma level, there is possible emission out to ~T+20 sec. T90 (15-350 keV) is 0.10 +- 0.02 sec (estimated error including systematics). The time-averaged spectrum from T+0.00 to T+0.136 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.00 +- 0.09. The fluence in the 15-150 keV band is 2.0 +- 0.1 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.43 sec in the 15-150 keV band is 2.2 +- 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/516997/BA/