TITLE: GCN CIRCULAR NUMBER: 19020 SUBJECT: GRB 160216A: Swift-BAT refined analysis DATE: 16/02/17 14:12:17 GMT FROM: Scott Barthelmy at NASA/GSFC 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), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), E. Troja (NASA/GSFC/UMCP), 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 downlinks, we report further analysis of BAT GRB 160216A (trigger #673978) (Troja, et al., GCN Circ. 19014). The BAT ground-calculated position is RA, Dec = 311.679, -71.550 deg, which is RA(J2000) = 20h 46m 43.0s Dec(J2000) = -71d 33' 01.0" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 48%. The mask-weighted light curve shows a small peak starting at ~T-0.3 sec, then two large peaks at ~T+0.6 s and ~T+3.2 sec, and ending at ~T+20 sec. T90 (15-350 keV) is 11.0 +- 1.0 sec (estimated error including systematics). The time-averaged spectrum from T-0.30 to T+11.70 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.48 +- 0.08. The fluence in the 15-150 keV band is 2.0 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.70 sec in the 15-150 keV band is 7.3 +- 0.5 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/673978/BA/