{
  "bibcode": "2007GCN..6429....1S",
  "body": "T. Sakamoto (GSFC/ORAU), L. Barbier (GSFC), S. D. Barthelmy (GSFC),\nJ. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC),\nH. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), A. Moretti (INAF-OAB),\nD. Palmer (LANL), A. Parsons (GSFC), G. Sato (GSFC/ISAS),\nM. Stamatikos (GSFC/ORAU), J. Tueller (GSFC)\non behalf of the Swift-BAT team:\n \nUsing the data set from T-239 to T+592 sec from recent telemetry downlinks,\nwe report further analysis of BAT GRB 070520B (trigger #279898)\n(Moretti, et al., GCN Circ. 6245).  The BAT ground-calculated position is\nRA, Dec = 121.886, 57.588 deg  which is \n   RA(J2000)  = 08h 07m 32.7s \n   Dec(J2000) = 57d 35' 15.3\" \nwith an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 59%.\n \nThe mask-weighted light curve shows two overlapping peaks starting\nat T-4 sec, peaking at T+1 sec, and ending with a long tail at T+200 sec.\nT90 (15-350 keV) is 66 +- 4 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T-5.0 to T+71.3 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.15 +- 0.21.  The fluence in the 15-150 keV band is 9.2 +- 1.1 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.74 sec in the 15-150 keV band\nis 0.4 +- 0.1 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.",
  "circularId": 6429,
  "createdOn": 1179706551000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 070520B, Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 070520B"
}