{
  "bibcode": "2015GCN.18429....1K",
  "body": "H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),\nN. Gehrels (GSFC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nA. Melandri (INAF-OAB), D. M. Palmer (LANL), T. Sakamoto (AGU),\nM. Stamatikos (OSU), T. N. Ukwatta (LANL)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-240 to T+352 sec from the recent telemetry downlinks,\nwe report further analysis of BAT GRB 151021A (trigger #660671)\n(Melandri, et al., GCN Circ. 18425).  The BAT ground-calculated position is\nRA, Dec = 337.647, -33.189 deg, which is \n   RA(J2000)  =  22h 30m 35.3s \n   Dec(J2000) = -33d 11' 21.8\" \nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 10%.\n \nThe mask-weighted light curve shows many overlapping peaks starting\nat ~T-50sec, with a maxiximum peak at ~T+1 sec, and ending at ~T+130 sec.\nT90 (15-350 keV) is 110.2 +- 3.7 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T-21.6 to T+127.4 sec (with a 1.5 sec data gap\nin the middle) is best fit by a simple power-law model.  The power law index\nof the time-averaged spectrum is 1.57 +- 0.04.  The fluence in the 15-150 keV band\nis 2.8 +- 0.1 x 10^-5 erg/cm2.  The 1-sec peak photon flux measured from T-0.13 sec\nin the 15-150 keV band is 9.7 +- 0.8 ph/cm2/sec.  All the quoted errors are\nat the 90% confidence level. \n \nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/660671/BA/",
  "circularId": 18429,
  "createdOn": 1445427811000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 151021A: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 151021A"
}