TITLE: GCN CIRCULAR NUMBER: 12968 SUBJECT: GRB 120219A: Swift-BAT refined analysis DATE: 12/02/20 02:31:54 GMT FROM: Scott Barthelmy at NASA/GSFC J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (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), C. A. Swenson (PSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 120219A (trigger #515375) (Swenson, et al., GCN Circ. 12964). The BAT ground-calculated position is RA, Dec = 129.862, 51.006 deg, which is RA(J2000) = 08h 39m 26.8s Dec(J2000) = +51d 00' 21.4" with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 77%. The mask-weighted light curve shows two slightly overlapping peaks starting at ~T-15 sec, peaking at T+0 and T+70 sec, and returning to baseline at ~T+140 sec. T90 (15-350 keV) is 90.5 +- 10.9 sec (estimated error including systematics). The time-averaged spectrum from T-7.83 to T+90.06 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index -0.60 +- 1.69, and Epeak of 51.6 +- 14.2 keV (chi squared 54.9 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 5.4 +- 1.4 x 10^-7 erg/cm2 and the 1-sec peak flux measured from T-2.30 sec in the 15-150 keV band is 0.3 +- 0.1 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.56 +- 0.23 (chi squared 63.9 for 57 d.o.f.). 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/515375/BA/