TITLE: GCN CIRCULAR NUMBER: 19734 SUBJECT: GRB 160726A, Swift-BAT refined analysis DATE: 16/07/27 01:18:02 GMT FROM: Amy Lien at GSFC S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), J. P. Norris (BSU), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), R. L. C. Starling (U Leicester), 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 160726A (trigger #706052) (Starling et al., GCN Circ. 19731). The BAT ground-calculated position is RA, Dec = 98.809, -6.617 deg which is RA(J2000) = 06h 35m 14.2s Dec(J2000) = -06d 37' 03.0" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 58%. The mask-weighted light curve shows a double-peaked structure that starts at ~T0 and ends at ~T+0.8 s, with the two peaks at ~ T0 and ~T+0.6 s, respectively. T90 (15-350 keV) is 0.7 +- 0.04 sec (estimated error including systematics). The time-averaged spectrum from T+0.0 to T+0.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.26 +- 0.13. The fluence in the 15-150 keV band is 2.6 +- 0.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.11 sec in the 15-150 keV band is 3.2 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level. Using a 4-ms binned light curve, the lag analysis finds a lag of is -3.5 +/- 3 ms for the 100-350 keV to 25-50 keV, and -5 +/- 6 ms for the 50-100 keV to 15-25 keV band. These numbers are consistent with those of a short GRB. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/706052/BA/