{
  "bibcode": "2011GCN.12030....1U",
  "body": "T. N. Ukwatta (MSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),\nJ. R. Cummings (GSFC/UMBC), M. De Pasquale (UCL-MSSL), N. Gehrels (GSFC),\nH. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), J. Tueller (GSFC)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-239 to T+963 sec from recent telemetry downlinks,\nwe report further analysis of BAT GRB 110520A (trigger #453747)\n(De Pasquale, et al., GCN Circ. 12020).  The BAT ground-calculated position is\nRA, Dec = 134.363, 56.418 deg which is \n   RA(J2000)  =  08h 57m 27.1s \n   Dec(J2000) = +56d 25' 04.9\" \nwith an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 69%.\n \nThe mask-weighted light curve shows a single FRED peak starting at ~T-2 sec,\npeaking at ~T+4 sec, and ending at ~T+40 sec.  T90 (15-350 keV)\nis 15.7 +- 1.8 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T-1.2 to T+16.6 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.13 +- 0.10.  The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+4.15 sec in the 15-150 keV band\nis 1.1 +- 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/453747/BA/",
  "circularId": 12030,
  "createdOn": 1305990266000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 110520A: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 110520A"
}