{
  "bibcode": "2011GCN.11946....1M",
  "body": "C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),\nJ. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),\nD. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), B. Sbarufatti (INAF-OAB/IASFPA),\nM. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-61 to T+242 sec from the recent telemetry downlink,\nwe report further analysis of BAT SHB GRB 110420B (trigger #451794)\n(Sbarufatti, et al., GCN Circ. 11944).  The BAT ground-calculated position is\nRA, Dec = 320.045, -41.277 deg, which is \n   RA(J2000)  =  21h 20m 10.9s \n   Dec(J2000) = -41d 16' 38.0\" \nwith an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 35%.\n \nThe mask-weighted light curve shows a FRED-like pulse starting at ~T+0.00\nand ending at ~T+0.08 sec.  T90 (15-350 keV) is 0.084 +- 0.021 sec\n(estimated error including systematics).\n \nThe time-averaged spectrum from T-0.004 to T+0.100 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index -1.52 +- 2.56, \nand Epeak of 79.5 +- 30.0 keV (chi squared 67.2 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 5.3 +- 1.1 x 10^-8 erg/cm2\nand the 1-sec peak flux measured from T-0.45 sec in the 15-150 keV band is\n0.7 +- 0.2 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 1.11 +- 0.27 (chi squared 73.8 for 57 d.o.f.).  All the quoted errors\nare at the 90% confidence level. \n \nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/451794/BA/",
  "circularId": 11946,
  "createdOn": 1303348810000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 110420B: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 110420B"
}