TITLE: GCN CIRCULAR NUMBER: 19924 SUBJECT: GRB 160912A, Swift-BAT refined analysis DATE: 16/09/15 17:03:17 GMT FROM: Amy Lien at GSFC J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), J. K. Cannizzo (NASA/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), 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-239 to T+959 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160912A (trigger #711914) (Cannizzo, et al., GCN Circ. 19912). The BAT ground-calculated position is RA, Dec = 301.595, 57.585 deg which is RA(J2000) = 20h 06m 22.7s Dec(J2000) = +57d 35' 04.8" with an uncertainty of 2.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 96%. The mask-weighted light curve shows some weak emissions that starts at ~ T-33 s, and a FRED-like pulse from ~T+140 s to ~T+200 s. We do not have much information of the burst emission afterwards due to some large gaps in the data after ~T+320 s. The time-averaged spectrum using the available data from T-33 to T+211 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.43 +- 0.11. The fluence in the 15-150 keV band is 3.7 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+148.56 sec in the 15-150 keV band is 1.6 +- 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/711914/BA/