{
  "bibcode": "2018GCN.23001....1K",
  "body": "H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), A. Y. Lien (GSFC/UMBC),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Sakamoto (AGU), B. Sbarufatti (PSU),\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 180721A (trigger #849018)\n(Sbarufatti et al., GCN Circ. 22994).  The BAT ground-calculated position is\nRA, Dec = 347.708, 4.871 deg which is\n  RA(J2000)  =  23h 10m 49.9s\n  Dec(J2000) = +04d 52' 16.1\"\nwith an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 100%.\n\nThe mask-weighted light curve shows a single-pulse structure that starts\nat ~T-1 s, peaks at ~T+2 s, and ends at ~T+10 s. The main pulse is followed\nby some weak emission that last till ~T+50 s. T90 (15-350 keV) is 47.6 +- 3.0 sec\n(estimated error including systematics).\n\nThe time-averaged spectrum from T-0.39 to T+48.92 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.25 +- 0.22.  The fluence in the 15-150 keV band is 5.9 +- 0.9 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T+1.82 sec in the 15-150 keV band\nis 0.9 +- 0.1 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/849018/BA/",
  "circularId": 23001,
  "createdOn": 1532199703000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 180721A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 180721A"
}