{
  "bibcode": "2011GCN.12160....1U",
  "body": "T. N. Ukwatta (MSU) S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),\nJ. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),\nE. Sonbas (GSFC/USRA/Adiyaman Univ.), M. Stamatikos (OSU), J. Tueller (GSFC),\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-60 to T+243 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 110715A (trigger #457330)\n(Sonbas, et al., GCN Circ. 12158).  The BAT ground-calculated position is\nRA, Dec = 237.665, -46.237 deg, which is \n   RA(J2000)  =  15h 50m 39.7s \n   Dec(J2000) = -46d 14' 13.9\" \nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 69%.\n \nThe mask-weighted light curve shows a bright first peak, which is composed\nof at least 2 overlapping peaks (at the lower energies), starting at ~T-10 sec\nand peaking at ~T+2.5 sec.  the first peak never returns to basline before\nthe second and much weaker peak goes from ~T+12 to T+17 sec.\nT90 (15-350 keV) is 13.0 +- 4.0 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T-3.1 to T+20.9 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index 1.25 +- 0.12, \nand Epeak of 120 +- 21 keV (chi squared 49.6 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 1.18 +- 0.02 x 10^-5 erg/cm2\nand the 1-sec peak flux measured from T+1.86 sec in the 15-150 keV band is\n53.9 +- 1.1 ph/cm2/sec.  To within the calibration limits, the Band model\nfits equally well.  A fit to a simple power law gives a photon index\nof 1.63 +- 0.03 (chi squared 81.5 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/457330/BA/",
  "circularId": 12160,
  "createdOn": 1310754358000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 110715A: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 110715A"
}