TITLE: GCN CIRCULAR NUMBER: 19896 SUBJECT: GRB 160905A: Swift-BAT refined analysis DATE: 16/09/06 02:51:10 GMT FROM: Takanori Sakamoto at AGU S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), P. D'Avanzo (INAF-OAB), 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+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160905A (trigger #711084) (D'Avanzo, et al., GCN Circ. 19887). The BAT ground-calculated position is RA, Dec = 162.249, -50.803 deg which is RA(J2000) = 10h 48m 59.7s Dec(J2000) = -50d 48' 09.2" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 98%. The mask-weighted light curve shows a bright main episode with several overlapping peaks starting at ~T-10 sec, peaking at ~T+10 sec and ending at ~T+25 sec. The additional peak is seen starting at ~T+30 sec, peaking at ~T+35 sec and ending at ~T+40 sec. The further weak extended emission is visible up to ~T+180 sec. T90 (15-350 keV) is 64 +- 16 sec (estimated error including systematics). The time-averaged spectrum from T-15.2 to T+96.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.04 +- 0.03. The fluence in the 15-150 keV band is 1.50 +- 0.02 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+8.30 sec in the 15-150 keV band is 6.3 +- 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/711084/BA/