{
  "bibcode": "2021GCN.30282....1L",
  "body": "A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC),\nP. D'Avanzo (INAF-OAB), H. A. Krimm (NSF),\nS. Laha (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\ndownlink, we report further analysis of BAT GRB 210619B (trigger #1056757)\n(D'Avanzo et al., GCN Circ. 30261).  The BAT ground-calculated position is\nRA, Dec = 319.718, 33.850 deg which is\n   RA(J2000)  =  21h 18m 52.3s\n   Dec(J2000) = +33d 50' 58.6\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 36%.\n\nThe mask-weighted light curve shows a bright pulse that starts at ~T0\nand peaks at ~T+1 s, and is followed by several overlapping pulses that\nlast till ~T+105 s. T90 (15-350 keV) is 60.90 +- 0.28 sec (estimated\nerror including systematics).\n\nThe time-averaged spectrum from T-0.25 to T+105.38 sec is best fit\nby a simple power-law model.  The power law index of the time-averaged\nspectrum is 1.41 +- 0.02.  The fluence in the 15-150 keV band is\n9.5 +- 0.1 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from\nT+0.95 sec in the 15-150 keV band is 115.0 +- 2.2 ph/cm2/sec.\nAll the quoted errors are at the 90% confidence level.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1056757/BA/",
  "circularId": 30282,
  "createdOn": 1624242419000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 210619B: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 210619B"
}