TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4318 SUBJECT: GRB 051210: Swift-BAT refined analysis of a short burst DATE: 05/12/10 08:54:24 GMT FROM: David Palmer at LANL G. Sato (ISAS), L. Angelini (GSFC-JHU), L. Barbier (GSFC), S. Barthelmy (GSFC), M. Chester (PSU), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the BAT data set from T-60 to T+120 sec from the recent telemetry downlink, we report further analysis of GRB 051210 (trigger #171931, Mangano, et al., GCN 4315). The BAT ground-calculated position is (RA,Dec) = 330.194,-57.623 (deg. J2000) {22h 0m 46.6s, -57d 37'21.0"} 2.0 arcmin radius (sys+stat, 90% containment). The partial coding was 90%. The burst light curve shape is a single, symmetric triangular peak. T90 (15-350 keV) is 1.4 +- 0.2 sec (estimated error including systematics). The power law index of the time-averaged spectrum is 1.1 +- 0.3. The fluence in the 15-150 keV band is (8.3 +- 1.4) x 10^-8 erg/cm2. The 1-sec peak photon flux measured starting from T+0.1 sec in the 15-150 keV band is (7.5 +- 1.2) x 10^-1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.