{
  "bibcode": "2014GCN.16756....1M",
  "body": "C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),\nJ. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),\nA. Y. Lien (GSFC/UMBC), A. Melandri (INAF-OAB), D. M. Palmer (LANL),\nT. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (LANL)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 140828A (trigger #610953)\n(Melandri, et al., GCN Circ. 16751).  The BAT ground-calculated position is\nRA, Dec = 142.029, 14.569 deg which is \n  RA(J2000)  =  09h 28m 07.0s \n  Dec(J2000) = +14d 34' 09.2\" \nwith an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 26%.\n\nThe mask-weighted light curve shows a single peak starting at T-7 sec, peaking \nat T+1 sec and ending at T+10 sec.  There is a hint of an emission peaking \nat T+14 sec.  T90 (15-350 keV) is 18.8 +- 4.0 sec (estimated error including \nsystematics).\n\nThe time-averaged spectrum from T-5.8 to T+18.4 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index 0.6 +- 0.7, \nand Epeak of 54 +- 11 keV (chi squared 70.26 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 1.3 +- 0.1 x 10^-6 erg/cm2\nand the 1-sec peak flux measured from T+0.51 sec in the 15-150 keV band is\n2.2 +- 0.3 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 1.78 +- 0.13 (chi squared 81.57 for 57 d.o.f.).  All the quoted errors\nare at the 90% confidence level. \n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/610953/BA/",
  "circularId": 16756,
  "createdOn": 1409352894000,
  "email": "tsakamoto@phys.aoyama.ac.jp",
  "subject": "GRB 140828A, Swift-BAT refined analysis",
  "submitter": "Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>",
  "eventId": "GRB 140828A"
}