{
  "bibcode": "2016GCN.20189....1U",
  "body": "T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC),  J. R. Cummings (GSFC/UMBC),\nN. Gehrels (GSFC), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU),\nM. Stamatikos (OSU), E. Troja (NASA/GSFC/UMCP), \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 161117B (trigger #722642)\n(Troja, et al., GCN Circ. 20182).  The BAT ground-calculated position is\nRA, Dec = 298.830, -67.681 deg which is \n   RA(J2000)  =  19h 55m 19.1s \n   Dec(J2000) = -67d 40' 51.8\" \nwith an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 43%.\n\nThe mask-weighted light curve shows a complex structure.  The first set of peaks\nbegins around T-10 sec, peaks at T+2 and fades by T+10 sec.  The second set \nof peaks begins around T+92 sec, peaks at T+102 sec and fades nearly to \nbackground by T+115 sec.  This is when the third set of peaks begins to rise,\nwhich peaks at T+T+135 sec and fades by T+160 sec.  All of these peak \nstructures have multiple sub-peaks. T90 (15-350 keV) is 152.51 +- 3.37 sec \n(estimated error including systematics).\n\nThe time-averaged spectrum from T-8.32 to T+157.44 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index 1.39 +- 0.28, \nand Epeak of 37.5 +- 5.5 keV (chi squared 39.62 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 6.0 +- 0.2 x 10^-6 erg/cm2\nand the 1-sec peak flux measured from T+133.80 sec in the 15-150 keV band is\n6.0 +- 0.3 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 2.14 +- 0.06 (chi squared 64.42 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/722642/BA/",
  "circularId": 20189,
  "createdOn": 1479408010000,
  "email": "hkrimm@nsf.gov",
  "subject": "GRB 161117B: Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NSF/NASA-GSFC  <hkrimm@nsf.gov>",
  "eventId": "GRB 161117B"
}