{
  "bibcode": "2014GCN.16316....1B",
  "body": "S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),\nN. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU),\nM. Stamatikos (OSU), E. Troja (NASA/GSFC/UMCP), J. Tueller (GSFC), T. N. Ukwatta (MSU)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-240 to T+963 sec from recent telemetry downlinks,\nwe report further analysis of BAT GRB 140521A (trigger #599546)\n(Troja, et al., GCN Circ. 16311).  The BAT ground-calculated position is\nRA, Dec = 320.177, 67.587 deg, which is \n   RA(J2000)  =  21h 20m 42.6s \n   Dec(J2000) = +67d 35' 12.7\" \nwith an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 55%.\n \nThe mask-weighted light curve shows a single peak starting at ~T-2 sec,\npeaking at ~T+1 sec, and ending at ~T+11 sec with a tail out to ~T+50 sec.\nT90 (15-350 keV) is 9.88 +- 1.09 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T+0.15 to T+11.44 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.42 +- 0.11.  The fluence in the 15-150 keV band is 9.5 +- 0.6 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.64 sec in the 15-150 keV band\nis 1.9 +- 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/599546/BA/",
  "circularId": 16316,
  "createdOn": 1400765220000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 140521A: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 140521A"
}