TITLE: GCN CIRCULAR NUMBER: 18593 SUBJECT: GRB 151112A: Swift-BAT refined analysis DATE: 15/11/12 22:26:38 GMT FROM: Hans Krimm at NASA-GSFC H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), A. Y. Lien (GSFC/UMBC), D. Malesani (DARK/NBI), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (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 151112A (trigger #663179) (Malesani, et al., GCN Circ. 18588). The BAT ground-calculated position is RA, Dec = 2.050, -61.680 deg which is RA(J2000) = 00h 08m 11.9s Dec(J2000) = -61d 40' 46.7" with an uncertainty of 2.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 52%. The mask-weighted light curve shows several overlapping peaks, starting with a sharp rise peaking at T=0 sec, then a second peak at T+5 sec, a third at T+10 sec and falling to background by T+20 sec. T90 (15-350 keV) is 19.32 +- 31.24 sec (estimated error including systematics). The time-averaged spectrum from T-0.06 to T+61.94 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.77 +- 0.21. The fluence in the 15-150 keV band is 9.4 +- 1.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.01 sec in the 15-150 keV band is 1.9 +- 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/663179/BA/