TITLE: GCN CIRCULAR NUMBER: 19276 SUBJECT: GRB 160410A: Swift-BAT refined analysis of the short GRB DATE: 16/04/10 17:41:10 GMT FROM: Scott Barthelmy at NASA/GSFC T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), S. L. Gibson (U Leicester), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), J. P. Norris (BSU), D. M. Palmer (LANL), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlinks, we report further analysis of BAT short GRB 160410A (trigger #682269) (Gibson, et al., GCN Circ. 19271). The BAT ground-calculated position is RA, Dec = 150.695, 3.461 deg, which is RA(J2000) = 10h 02m 46.9s Dec(J2000) = +03d 27' 40.3" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 37%. The mask-weighted light curve shows an initial spike starting at ~T-0.2 s peaking at ~T+0.1 s with a decay out to ~T+2.5 s, then a greatly reduced flux level portion out to ~T+9 s. T90 (15-350 keV) is 8.2 +- 1.6 s (estimated error including systematics). The time-averaged spectrum from T+0.04 to T+9.60 s is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.93 +- 0.17. The fluence in the 15-150 keV band is 7.8 +- 0.8 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.04 sec in the 15-150 keV band is 3.5 +- 0.3 ph/cm2/s. 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/682269/BA/ Using a 4-ms binned light curve for this bright burst, the lag of the initial pulse (~T0 to ~T0+2 s) for the 100-350 keV to 25-50 keV bands is -3 (+/-7) ms (with 1-sigma error) and for the 50-100 kev to 15-25 keV bands the lag is 8 (+/-14) ms. These values are consistant with zero, thus confirming that this is a short GRB. There is extended emission out to ~T+10 sec at ~0.038 counts/det/sec then dropping to ~0.0055 counts/det/sec out to ~T+92 sec.