TITLE: GCN CIRCULAR NUMBER: 12671 SUBJECT: GRB 111212A: Swift-BAT refined analysis DATE: 11/12/12 14:55:22 GMT FROM: Scott Barthelmy at NASA/GSFC T. N. Ukwatta (MSU) S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), S. Campana (INAF-OAB), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 111212A (trigger #509543) (Campana, et al., GCN Circ. 12667). The BAT ground-calculated position is RA, Dec = 310.442, -68.585 deg, which is RA(J2000) = 20h 41m 46.0s Dec(J2000) = -68d 35' 04.5" with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 35%. The mask-weighted light curve shows a FRED-like pulse starting at ~T-2 sec, peaking at ~T+6 sec, and returning to background around T+60 sec. Since Swift slewed due to an observing constraint, the burst location left the BAT FoV at ~T+70 sec, so we can not say if there was further actitivty in the lightcurve. The time-averaged spectrum from T-5.77 to T+62.74 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.67 +- 0.18. The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+4.76 sec in the 15-150 keV band is 0.8 +- 0.3 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/509543/BA/