TITLE: GCN CIRCULAR NUMBER: 20233 SUBJECT: GRB 161202A: Swift-BAT refined analysis DATE: 16/12/04 02:10:37 GMT FROM: Amy Lien at GSFC J. R. Cummings (CPI), S. D. Barthelmy (GSFC), N. Gehrels (GSFC), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), B. Sbarufatti (INAF-OAB/PSU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 161202A (trigger #725036) (Sbarufatti, et al., GCN Circ. 20227). The BAT ground-calculated position is RA, Dec = 356.904, 19.652 deg which is RA(J2000) = 23h 47m 36.9s Dec(J2000) = +19d 39' 06.3" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 86%. The first peaks of the burst occurred before it came into the BAT field of view at ~T-67 s. The mask-weighted light curve shows more than ten pulses that last till ~T+80 s. The time-averaged spectrum from T-63.41 to T+65.79 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.55 +- 0.05. The fluence in the 15-150 keV band is 8.6 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.11 sec in the 15-150 keV band is 5.9 +- 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/725036/BA/