TITLE: GCN CIRCULAR NUMBER: 18002 SUBJECT: GRB 150710A: Swift-BAT refined analysis DATE: 15/07/10 13:52:31 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), M. G. Bernardini (INAF-OAB), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), 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-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 150710A (trigger #648437) (Bernardini, et al., GCN Circ. 18000). The BAT ground-calculated position is RA, Dec = 194.484, 14.309 deg, which is RA(J2000) = 12h 57m 56.3s Dec(J2000) = +14d 18' 32.3" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows two, possibly 4, overlapping peaks. T90 (15-350 keV) is 0.15 +- 0.06 sec (estimated error including systematics). The time-averaged spectrum from T+0.02 to T+0.22 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.63 +- 0.20. The fluence in the 15-150 keV band is 7.1 +- 0.9 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T-0.38 sec in the 15-150 keV band is 0.7 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level. These results are entirely consistant with a short GRB. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/648437/BA/