{
  "subject": "GRB 160410A: Swift-BAT refined analysis of the short GRB",
  "eventId": "GRB 160410A",
  "bibcode": "2016GCN.19276....1S",
  "createdOn": 1460310070000,
  "circularId": 19276,
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "email": "scott@lheamail.gsfc.nasa.gov",
  "body": "T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),\nN. Gehrels (GSFC), S. L. Gibson (U Leicester), H. A. Krimm (GSFC/USRA),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), J. P. Norris (BSU),\nD. M. Palmer (LANL), M. Stamatikos (OSU), T. N. Ukwatta (LANL)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-60 to T+243 sec from the recent telemetry downlinks,\nwe report further analysis of BAT short GRB 160410A (trigger #682269)\n(Gibson, et al., GCN Circ. 19271).  The BAT ground-calculated position is\nRA, Dec = 150.695, 3.461 deg, which is \n   RA(J2000)  =  10h 02m 46.9s \n   Dec(J2000) = +03d 27' 40.3\" \nwith an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 37%.\n \nThe mask-weighted light curve shows an initial spike starting at ~T-0.2 s\npeaking at ~T+0.1 s with a decay out to ~T+2.5 s, then a greatly reduced\nflux level portion out to ~T+9 s.  T90 (15-350 keV) is 8.2 +- 1.6 s\n(estimated error including systematics).\n \nThe time-averaged spectrum from T+0.04 to T+9.60 s is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n0.93 +- 0.17.  The fluence in the 15-150 keV band is 7.8 +- 0.8 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.04 sec in the 15-150 keV band\nis 3.5 +- 0.3 ph/cm2/s.  All the quoted errors are at the 90% confidence level. \n \nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/682269/BA/\n\nUsing a 4-ms binned light curve for this bright burst, the lag of the initial pulse\n(~T0 to ~T0+2 s) for the 100-350 keV to 25-50 keV bands is -3 (+/-7) ms\n(with 1-sigma error) and for the 50-100 kev to 15-25 keV bands the lag is 8 (+/-14) ms.\nThese values are consistant with zero, thus confirming that this is a short GRB.\nThere is extended emission out to ~T+10 sec at ~0.038 counts/det/sec then dropping\nto ~0.0055 counts/det/sec out to ~T+92 sec."
}