TITLE: GCN CIRCULAR NUMBER: 16284 SUBJECT: GRB 140515A: Swift-BAT refined analysis DATE: 14/05/16 20:03:00 GMT FROM: Amy Lien at GSFC M. Stamatikos (OSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), P. D'Avanzo (INAF-OAB), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-288 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 140515A (trigger #599037) (D'Avanzo, et al., GCN Circ. 16267). The BAT ground-calculated position is RA, Dec = 186.071, 15.099 deg which is RA(J2000) = 12h 24m 17.0s Dec(J2000) = +15d 05' 55.8" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 99%. The mask-weighted light curve shows a double-peaked structure. The first pulse starts at ~T-22 s and peaks at ~T-18 s. The second pulse starts at ~T-10 s, peaks at ~T+2 s, and ends at ~T+4 s. T90 (15-350 keV) is 23.4 +- 2.1 sec (estimated error including systematics). The time-averaged spectrum from T-22.0 to T+3.8 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.98 +- 0.64, and Epeak of 51.3 +- 14.7 keV (chi squared 54.37 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 5.9 +- 0.6 x 10^-7 erg/cm2 and the 1-sec peak flux measured from T+1.51 sec in the 15-150 keV band is 0.9 +- 0.1 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.85 +- 0.13 (chi squared 61.03 for 57 d.o.f.). 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/599037/BA/