TITLE: GCN CIRCULAR NUMBER: 19861 SUBJECT: GRB 160824A: Swift-BAT refined analysis DATE: 16/08/25 16:50:54 GMT FROM: Hans Krimm at NASA-GSFC T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), P.A. Evans (U Leicester), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), 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 160824A (trigger #709765) (Evans, et al., GCN Circ. 19855). The BAT ground-calculated position is RA, Dec = 80.087, 40.039 deg which is RA(J2000) = 05h 20m 20.8s Dec(J2000) = +40d 02' 21.6" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 55%. The mask-weighted light curve shows two episodes of emission. The first runs from T-5 sec to roughly T+45 sec and contains multiple peaks. The second runs from T+85 sec to T+110 sec. T90 (15-350 keV) is 99.3 +- 7.8 sec (estimated error including systematics). The time-averaged spectrum from T-0.66 to T+111.58 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.64 +- 0.11. The fluence in the 15-150 keV band is 2.6 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+4.88 sec in the 15-150 keV band is 1.3 +- 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/709765/BA/ [GCN OPS NOTE(25aug16): Per author's request, the TBDs for the time range of the spectral average was filled in with the actual values.]