TITLE: GCN CIRCULAR NUMBER: 13689 SUBJECT: GRB 120819A: Swift-BAT refined analysis DATE: 12/08/20 12:25:42 GMT FROM: Scott Barthelmy at NASA/GSFC T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), 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), G. Sato (ISAS), M. Stamatikos (OSU), 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 the recent telemetry downlink, we report further analysis of BAT GRB 120819A (trigger #531428) (Beardmore, et al., GCN Circ. 13681). The BAT ground-calculated position is RA, Dec = 235.887, -7.304 deg, which is RA(J2000) = 15h 43m 32.8s Dec(J2000) = -07d 18' 13.5" with an uncertainty of 2.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 30%. The mask-weighted light curve shows multiple peaks starting at ~T-2 sec, with the largest peak at ~T+0 sec, and returning to baseline at ~T+180 sec. T90 (15-350 keV) is 71 +- 21 sec (estimated error including systematics). The time-averaged spectrum from T+4.42 to T+82.88 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.49 +- 0.23. 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+6.20 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/531428/BA/