TITLE: GCN CIRCULAR NUMBER: 16509 SUBJECT: GRB 140703A: Swift-BAT refined analysis DATE: 14/07/03 14:48:12 GMT FROM: Scott Barthelmy at NASA/GSFC H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), D. Kocevski (NASA/GSFC/ORAU), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), 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-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 140703A (trigger #603243) (Kocevski, et al., GCN Circ. 16503). The BAT ground-calculated position is RA, Dec = 13.010, 45.102 deg, which is RA(J2000) = 00h 52m 02.4s Dec(J2000) = +45d 06' 07.5" with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 14%. The mask-weighted light curve shows several peaks starting at ~T-70 sec, peakings at ~T-50, ~T+2 & ~T+70 sec, and ending at ~T+140 sec. T90 (15-350 keV) is 67.1 +- 67.9 sec (estimated error including systematics). The time-averaged spectrum from T-2.5 to T+134.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.74 +- 0.13. The fluence in the 15-150 keV band is 3.9 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.36 sec in the 15-150 keV band is 2.8 +- 0.6 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/603243/BA/