{
  "bibcode": "2010GCN.11018....1U",
  "body": "T. N. Ukwatta (GWU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),\nJ. K. Cannizzo (NASA/UMBC),J. R. Cummings (GSFC/UMBC),\nE. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),\nC. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),\nG. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC),\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-130 to T+963 sec from the recent telemetry \ndownlink,\nwe report further analysis of BAT GRB 100728A (trigger #430151)\n(Cannizzo, et al., GCN Circ. 11004).  The BAT ground-calculated position is\nRA, Dec = 88.753, -15.259 deg which is\n  RA(J2000)  =  05h 55m 00.7s\n  Dec(J2000) = -15d 15' 33.0\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 81%.\n\nThe BAT light curve is quite complex with a long series of peaks and flares\nextending from approximately T-100 sec to T+750 sec.  Detected emission\nbegan around T-100 sec, rising to a first peak at T-40 sec.  The burst\ncontinued as a series of at least ten overlapping peaks with the strongest\npeak centered at T+30 sec.  There was a strong set of BAT peaks centered\nat T+120 sec, corresponding with the second flare detected by the XRT\n(Evans & Cannizzo, GCN Circ 11014).  This was followed by a series of \nweaker\nflares out to T+750 sec, at times which appear to correspond to flares\ndetected by the XRT. The burst triggered just after the spacecraft settled\nfollowing a slew to a pre-planned target, so it is possible that there was\nsome very early emission (before T-120 sec) which was not detected. T90\n(15-350 keV) is 198.5 +- 12.7 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-84.3 to T+334.0 sec is best fit by a\nsimple power-law model.  The power law index of the time-averaged spectrum\nis 1.18 +- 0.02.  The fluence in the 15-150 keV band is 3.8 +- 0.0 x 10^-5\nerg/cm2. The 1-sec peak photon flux measured from T+28.26 sec in the 15-150\nkeV band is 5.1 +- 0.2 ph/cm^2/sec.  All the quoted errors are at the 90%\nconfidence level.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/430151/BA/",
  "circularId": 11018,
  "createdOn": 1280330542000,
  "email": "hans.a.krimm@nasa.gov",
  "subject": "GRB 100728A, Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NASA-GSFC  <hans.a.krimm@nasa.gov>",
  "eventId": "GRB 100728A"
}