TITLE: GCN CIRCULAR NUMBER: 15063 SUBJECT: GRB 130803A, Swift-BAT refined analysis DATE: 13/08/03 19:03:46 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift GRB 130803A, Swift-BAT refined analysis J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), T. Sakamoto (AGU), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130803A (trigger #565263) (Page, et al., GCN Circ. 15059). The BAT ground-calculated position is RA, Dec = 220.256, -2.499 deg which is RA(J2000) = 14h 41m 01.4s Dec(J2000) = -02d 29' 58" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 30%. The mask-weighted light curve shows two well-separated symmetrical peaks. The first, larger peak starts at about T0-2 seconds and lasts until about T+8 seconds. The second peak, which was softer, starts about T0+41 seconds and lasts until about T0+48 seconds. T90 (15-350 keV) is 44 +- 2 sec (estimated error including systematics). The time-averaged spectrum from T-1.24 to T+45.76 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.69 +- 0.14. The fluence in the 15-150 keV band is 1.5 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+2.09 sec in the 15-150 keV band is 5.1 +- 0.4 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/565263/BA/