TITLE: GCN CIRCULAR NUMBER: 15908 SUBJECT: GRB 140302A: Swift-BAT refined analysis DATE: 14/03/02 20:27:28 GMT FROM: Scott Barthelmy at NASA/GSFC 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 (NASA/UMBC), C. B. Markwardt (GSFC), C. Pagani (U Leicester), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+303 sec from recent telemetry downlinks, we report further analysis of BAT GRB 140302A (trigger #589685) (Pagani, et al., GCN Circ. 15901). The BAT ground-calculated position is RA, Dec = 253.862, -12.875 deg, which is RA(J2000) = 16h 55m 26.8s Dec(J2000) = -12d 52' 29.8" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 82%. The mask-weighted light curve shows a sharp rise starting at ~T-0.1 sec, peaking at ~T+0.2 sec, and a roughly exponential decay with several small peaks riding on top, finally returning to baseline at ~T+190 sec. T90 (15-350 keV) is 87.5 +- 11.4 sec (estimated error including systematics). The time-averaged spectrum from T-0.09 to T+106.25 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.09 +- 0.09. The fluence in the 15-150 keV band is 2.7 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.10 sec in the 15-150 keV band is 1.7 +- 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/589685/BA/