TITLE: GCN CIRCULAR NUMBER: 19066 SUBJECT: GRB 160223A: Swift-BAT refined analysis DATE: 16/02/24 07:39:55 GMT FROM: Tilan Ukwatta at LANL C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), 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-239 to T+581 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160223A (trigger #675361) (Markwardt, et al., GCN Circ. 19057). The BAT ground-calculated position is RA, Dec = 147.603, 9.369 deg which is RA(J2000) = 09h 50m 24.8s Dec(J2000) = +09d 22' 09.3" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 53%. BAT light curve shows two episodes. The first episode starts ~T-10 sec, peaks at ~T+0 sec and ends around ~T+20 sec. The second multi-peaked episode starts around T+70 sec and ends around ~T+120 sec. T90 (15-350 keV) is 127 +- 8 sec (estimated error including systematics). The time-averaged spectrum from T-6.00 to T+143.13 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.34 +- 0.07. The fluence in the 15-150 keV band is 5.0 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+109.95 sec in the 15-150 keV band is 3.1 +- 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/675361/BA/