TITLE: GCN CIRCULAR NUMBER: 19038 SUBJECT: GRB 160220A: Swift-BAT refined analysis DATE: 16/02/20 21:43:14 GMT FROM: Hans Krimm at NASA-GSFC H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (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+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160220A (trigger #674670) (Lien, et al., GCN Circ. 19023). The BAT ground-calculated position is RA, Dec = 236.942, -18.539 deg which is RA(J2000) = 15h 47m 46.2s Dec(J2000) = -18d 32' 20.6" with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 26%. The mask-weighted light curve shows a single peak of about 20 seconds total duration starting at ~0 sec. The spacecraft slewed away from the burst location at ~T+220 sec due to a pre-planned maneuver. T90 (15-350 keV) is 8.3 +- 1.2 sec (estimated error including systematics). The time-averaged spectrum from T-0.02 to T+8.99 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.55 +- 0.24. The fluence in the 15-150 keV band is 5.2 +- 0.7 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.33 sec in the 15-150 keV band is 1.0 +- 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/674670/BA/