TITLE: GCN CIRCULAR NUMBER: 17814 SUBJECT: GRB 150513A: Swift-BAT refined analysis DATE: 15/05/14 17:50:21 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift GRB 150513A: Swift-BAT refined analysis A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 150513A (trigger #640584) (Kocevski, et al., GCN Circ. 17810). The BAT ground-calculated position is RA, Dec = 49.044, -22.868 deg which is RA(J2000) = 03h 16m 10.6s Dec(J2000) = -22d 52' 03.3" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 64%. The mask-weighted light curve shows multiple peaks with a return to background levels in between them. T90 (15-350 keV) is 162 +- 5 sec (estimated error including systematics). The time-averaged spectrum from T-54.33 to T+129.36 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.40 +- 0.07. The fluence in the 15-150 keV band is 5.4 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+115.41 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.