{
  "bibcode": "2017GCN.20896....1B",
  "body": "S. D. Barthelmy (GSFC), J. R. Cummings (CPI),\nN. Gehrels (GSFC), H. A. Krimm (NSF/USRA),\nS. J. LaPorte (PSU), A. Y. Lien (GSFC/UMBC),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Sakamoto (AGU), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+962 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 170317A (trigger #742866)\n(LaPorte et al., GCN Circ. 20885).  The BAT ground-calculated position is\nRA, Dec = 93.087, 50.500 deg which is\n  RA(J2000)  =  06h 12m 21.0s\n  Dec(J2000) = +50d 30' 00.5\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 46%.\n\nThe mask-weighted light curve shows a FRED-like pulse that starts at\n~T-2 s, peaks at ~ T+2 s, and ends at ~T+18 s. T90 (15-350 keV) is\n11.94 +- 4.87 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.29 to T+18.29 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index 0.80 +- 0.49,\nand Epeak of 58.8 +- 10.5 keV (chi squared 75.18 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 1.3 +- 0.1 x 10^-6 erg/cm2\nand the 1-sec peak flux measured from T+1.28 sec in the 15-150 keV band is\n3.5 +- 0.3 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 1.78 +- 0.10 (chi squared 89.59 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/742866/BA/",
  "circularId": 20896,
  "createdOn": 1489784545000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 170317A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 170317A"
}