TITLE: GCN CIRCULAR NUMBER: 17410 SUBJECT: GRB 150203A: Swift-BAT refined analysis DATE: 15/02/05 15:36:38 GMT FROM: Tilan Ukwatta at MSU T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), 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), J. Tueller (GSFC), (i.e. the Swift-BAT team): Using the data set from T-120 to T+1190 sec from the recent telemetry downlink, we report further analysis of BAT GRB GRB 150203A (trigger #629578) (Ukwatta, et al., GCN Circ. 17377).The BAT ground-calculated position is RA, Dec = 98.394, 6.952 deg which is RA(J2000) = 06h 33m 34.5s Dec(J2000) = +06d 57' 07.1" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 84%. BAT light curve shows a single multi-peaked episode starting around T-2 sec, and ending around T+32 sec. The two main peaks of the light curve can be seen at T+1 sec and T+18 sec. T90 (15-350 keV) is 25.8 +- 5.0 sec (estimated error including systematics). The time-averaged spectrum from T-0.8 to T+32.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.90 +- 0.12. The fluence in the 15-150 keV band is 9.1 +- 0.6 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+16.79 sec in the 15-150 keV band is 0.9 +- 0.1 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/629578/BA/