{
  "bibcode": "2009GCN..9593....1M",
  "body": "C. B. Markwardt (GSFC/UMD), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),\nJ. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC),\nH. A. Krimm (GSFC/USRA), V. Mangano (INAF-IASFPA), D. M. Palmer (LANL),\nT. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU),\nJ. Tueller (GSFC), T. N. Ukwatta (GWU)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-240 to T+649 sec from recent telemetry downlinks,\nwe report further analysis of BAT GRB 090628 (trigger #355942)\n(Mangano, et al., GCN Circ. 9585).  The BAT ground-calculated position is\nRA, Dec = 237.038, -15.969 deg, which is \n   RA(J2000)  =  15h 48m 09.0s \n   Dec(J2000) = -15d 58' 09.0\" \nwith an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 63%.\n \nThe mask-weighted light curve shows a weak 1-sec wide precursor peak\nat ~T-7.5 sec that then returns almost to background levels, and the\nmain peak starting at ~T-0.3 sec, peaking at ~T+1 sec, and ending \nat ~T+6 sec.  T90 (15-350 keV) is 20.1 +- 4.6 sec (estimated error\nincluding systematics).\n \nThe time-averaged spectrum from T-25.0 to T+4.0 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.36 +- 0.20.  The fluence in the 15-150 keV band is 7.0 +- 0.8 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.05 sec in the 15-150 keV band\nis 1.5 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel. \n \nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/355942/BA/",
  "circularId": 9593,
  "createdOn": 1246279386000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 090628: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 090628"
}