{
  "bibcode": "2017GCN.20456....1M",
  "body": "C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), N. Gehrels (GSFC),\nH. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC),\nD. 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+962 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 170113A (trigger #732526)\n(Evans et al., GCN Circ. 20446).  The BAT ground-calculated position is\nRA, Dec = 61.735, -71.933 deg which is\n   RA(J2000)  =  04h 06m 56.5s\n   Dec(J2000) = -71d 55' 58.0\"\nwith an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 86%.\n\nThe mask-weighted light curve shows a multi-peaked structure that starts\nat ~T0 and ends at ~T+25 s. The main peak occurs at ~T+2 s. T90 (15-350 keV)\nis 20.66 +- 4.44 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.61 to T+23.84 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index 0.75 +- 0.59,\nand Epeak of 73.3 +- 33.6 keV (chi squared 72.24 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 6.7 +- 0.7 x 10^-7 erg/cm2\nand the 1-sec peak flux measured from T+1.63 sec in the 15-150 keV band is\n1.1 +- 0.1 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 1.57 +- 0.13 (chi squared 79.06 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/732526/BA/",
  "circularId": 20456,
  "createdOn": 1484363022000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 170113A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 170113A"
}