{
  "bibcode": "2019GCN.24330....1U",
  "body": "T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), H. A. Krimm (NSF/USRA),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), T. Sakamoto (AGU),\nM. Stamatikos (OSU), A. Tohuvavohu (PSU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-61 to T+242 sec from the recent telemetry\ndownlink,\nwe report further analysis of BAT GRB 190427A (trigger #900730)\n(Tohuvavohu et al., GCN Circ. 24261).  The BAT ground-calculated position is\nRA, Dec = 280.217, 40.304 deg which is\n   RA(J2000)  =  18h 40m 52.0s\n   Dec(J2000) = +40d 18' 15.6\"\nwith an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 68%.\n\nThe mask-weighted light curve shows a double-peaked structure that starts\nfrom ~ T0 and ends at ~T+0.3. The main peak occurs at ~T0, followed by a\nweaker peak at ~T+0.2 s. T90 (15-350 keV) is 0.3 +- 0.1 sec\n(estimated error including systematics).\n\nThe time-averaged spectrum from T-0.0 to T+0.3 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.17 +- 0.21.  The fluence in the 15-150 keV band is 1.3 +- 0.2 x 10^-7\nerg/cm2.\nThe 1-sec peak photon flux measured from T-0.33 sec in the 15-150 keV band\nis 1.6 +- 0.3 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/900730/BA/",
  "circularId": 24330,
  "createdOn": 1556466056000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 190427A, Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 190427A"
}