{
  "bibcode": "2007GCN..6589....1K",
  "body": "H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. D. Barthelmy (GSFC),\nJ. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC),\nS. T. Holland (CRESST/GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL),\nA. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS),\nM. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-240 to T+67 sec from recent telemetry downlinks,\nwe report further analysis of BAT GRB 070628 (trigger #283320)\n(Holland, et al., GCN Circ. 6584).  The BAT ground-calculated position is\nRA, Dec = 115.271, -20.281 deg which is \n   RA(J2000)  =   7h 41m 5.1s \n   Dec(J2000) = -20d 16' 50\"\nwith an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 58%.\n \nThe mask-weighted light curve shows pretrigger emission starting at\nT-30 sec.  Then comes the main emission peak (roughly symmetrical)\nstarting at ~T-5 sec and ending at ~T+20 sec.  T90 (15-350 keV) is\n39.1 +- 2 sec (estimated error including systematics).  The BAT data\nend at T+67 sec because Swift entered the SAA.\n \nThe time-averaged spectrum from T-31.7 to T+16.2 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.91 +- 0.09.  The fluence in the 15-150 keV band is 3.5 +- 0.2 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+4.90 sec in the 15-150 keV band\nis 5.1 +- 0.3 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.",
  "circularId": 6589,
  "createdOn": 1183122721000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 070628, Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 070628"
}