{
  "bibcode": "2018GCN.22601....1C",
  "body": "J. R. Cummings (CPI), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF/USRA), S. J. LaPorte (PSU),\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-240 to T+962 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 180404B (trigger #821902)\n(LaPorte et al., GCN Circ. 22590).  The BAT ground-calculated position is\nRA, Dec = 53.390, -50.213 deg which is\n  RA(J2000)  =  03h 33m 33.6s\n  Dec(J2000) = -50d 12' 47.4\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 84%.\n\nThe mask-weighted light curve shows a major pulse that starts at ~ T-6 s and peaks\nat ~ T+ 10 s. Another weaker pulse arises at the end of the major pulse at ~ T+40 s.\nThe second pulse peaks at ~ T+50 s and lasts until ~ T+200 s. T90 (15-350 keV)\nis 111.5 +- 7.1 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-5.91 to T+195.64 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.35 +- 0.04.  The fluence in the 15-150 keV band is 1.20 +- 0.02 x 10^-5 erg/cm2.\nThe 1-sec peak photon flux measured from T+8.88 sec in the 15-150 keV band\nis 5.2 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/821902/BA/",
  "circularId": 22601,
  "createdOn": 1522874366000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 180404B: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 180404B"
}