TITLE: GCN CIRCULAR NUMBER: 22259 SUBJECT: GRB 171216A: Swift-BAT refined analysis DATE: 17/12/16 17:08:52 GMT FROM: Amy Lien at GSFC C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/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-240 to T+302 sec from the recent telemetry downlink, we report further analysis of BAT GRB 171216A (trigger #797441) (Marshall et al., GCN Circ. 22256). The BAT ground-calculated position is RA, Dec = 212.013, -50.500 deg which is RA(J2000) = 14h 08m 03.0s Dec(J2000) = -50d 30' 01.2" with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 63%. The mask-weighted light curve shows a weak single-peaked structure that starts at ~T0, peaks at ~T+3 s, and ends at ~ T+30 s. T90 (15-350 keV) is 30.0 +- 7.5 sec (estimated error including systematics). The time-averaged spectrum from T-0.45 to T+33.47 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.63 +- 0.30. The fluence in the 15-150 keV band is 4.8 +- 1.0 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+3.05 sec in the 15-150 keV band is 0.8 +- 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/797441/BA/