{
  "bibcode": "2018GCN.22566....1P",
  "body": "D. M. Palmer (LANL), S. D. Barthelmy (GSFC),  J. R. Cummings (CPI),\nH. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nJ. L. Racusin (NASA/GSFC), T. 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 180329B (trigger #819490)\n(Racusin et al., GCN Circ. 22558).  The BAT ground-calculated position is\nRA, Dec = 82.905, -23.694 deg which is\n  RA(J2000)  =  05h 31m 37.2s\n  Dec(J2000) = -23d 41' 39.8\"\nwith an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 15%.\n\nThe mask-weighted light curve shows a triple-peaked structure, with the first peak\nrunning from T-10 to T+40 sec, and the second peak from T+130 to T+160 sec.\nThis is followed by a much weaker, softer peak from T+160 to T+280 sec.\nT90 (15-350 keV) is 210.0 +- 44.0 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-9.91 to T+230.39 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index 0.97 +- 0.56,\nand Epeak of 48.6 +- 9.1 keV (chi squared 54.64 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 3.3 +- 0.3 x 10^-6 erg/cm2\nand the 1-sec peak flux measured from T+1.56 sec in the 15-150 keV band is\n1.4 +- 0.4 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 1.93 +- 0.12 (chi squared 65.32 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/819490/BA/",
  "circularId": 22566,
  "createdOn": 1522418268000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 180329B: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 180329B"
}