{
  "bibcode": "2016GCN.20337....1U",
  "body": "T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), \nA. Cholden-Brown (PSU), J. R. Cummings (CPI),\nN. Gehrels (GSFC), H. A. Krimm (NSF/USRA),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\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-239 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 161224A (trigger #728268)\n(Cholden-Brown et al., GCN Circ. 20335).  The BAT ground-calculated position is\nRA, Dec = 204.820, -18.028 deg which is \n   RA(J2000)  =  13h 39m 16.9s \n   Dec(J2000) = -18d 01' 41.7\" \nwith an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 48%.\n \nThe mask-weighted light curve shows a single pulse structure that starts at \n~ T+12 s, peaks at ~T+33 s, and ends at ~T+65 s. T90 (15-350 keV) is \n47.04 +- 12.12 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T+12.46 to T+65.18 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index -0.21 +- 1.56, \nand Epeak of 34.5 +- 5.6 keV (chi squared 44.84 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is (8.2 +- 1.3) x 10^-7 erg/cm2\nand the 1-sec peak flux measured from T+32.88 sec in the 15-150 keV band is\n0.8 +- 0.3 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 2.21 +- 0.21 (chi squared 57.66 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/728268/BA/",
  "circularId": 20337,
  "createdOn": 1482690204000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 161224A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 161224A"
}