TITLE: GCN CIRCULAR NUMBER: 19878 SUBJECT: GRB 160827A: Swift-BAT refined analysis DATE: 16/08/27 22:23:49 GMT FROM: Scott Barthelmy at NASA/GSFC T. N. Ukwatta (LANL) S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), (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 160827A (trigger #710050) (Page, et al., GCN Circ. 19876). The BAT ground-calculated position is RA, Dec = 179.274, -29.178 deg, which is RA(J2000) = 11h 57m 05.8s Dec(J2000) = -29d 10' 40.9" with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 48%. The mask-weighted light curve shows a few olverlapping peaks starting at ~T-5 sec, peaking at ~T+3 sec, and ending at ~T+13 sec. T90 (15-350 keV) is 13.3 +- 2.2 sec (estimated error including systematics). The time-averaged spectrum from T-5.81 to T+8.78 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.95 +- 0.25. The fluence in the 15-150 keV band is 4.0 +- 0.7 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+2.49 sec in the 15-150 keV band is 0.7 +- 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/710050/BA/