TITLE: GCN CIRCULAR NUMBER: 14550 SUBJECT: GRB 130502A: Swift-BAT refined analysis DATE: 13/05/04 01:58:01 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), A. Y. Lien (NASA/GSFC/ORAU), T. Sakamoto (AGU), C. B. Markwardt (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), D. M. Palmer (LANL), G. Sato (ISAS), M. Stamatikos (OSU), E. Troja (NASA/GSFC/UMCP), 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 130502A (trigger #554996) (Troja, et al., GCN Circ. 14527). The BAT ground-calculated position is RA, Dec = 138.579, -0.134 deg, which is RA(J2000) = 09h 14m 19.1s Dec(J2000) = -00d 08' 04.2" with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 47%. The mask-weighted light curve consists a single FRED pulse starting at ~T-0.3 sec, peaking at ~T+0.1 sec, and returning to baseline at ~T+4 sec. T90 (15-350 keV) is 3.0 +- 0.3 sec (estimated error including systematics). The time-averaged spectrum from T-0.19 to T+3.20 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.78 +- 0.16. The fluence in the 15-150 keV band is 3.8 +- 0.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T-0.21 sec in the 15-150 keV band is 2.9 +- 0.3 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/554996/BA/