{
  "bibcode": "2020GCN.27148....1L",
  "body": "S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), H. A. Krimm (NSF),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nJ. P. Norris (BSU), D. M. Palmer (LANL),\nT. 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\ndownlink,\nwe report further analysis of BAT GRB 200219A (trigger #957271)\n(Lien et al., GCN Circ. 27125).  The BAT ground-calculated position is\nRA, Dec = 342.595, -59.101 deg which is\n   RA(J2000)  =  22h 50m 22.7s\n   Dec(J2000) = -59d 06' 04.5\"\nwith an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 99%.\n\nThe mask-weighted light curve shows a short pulse that starts and peaks at\n~T0,\nand ends at ~T+0.5 s. It is followed by an extended emission that lasting\nuntil ~T+90 s. In addition, there may be some even weaker emission until\n~T+300 s.\nT90 (15-350 keV) is 288.0 +- 50.6 sec (estimated error including\nsystematics).\n\nThe time-averaged spectrum from T-0.2 to T+86.7 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.47 +- 0.25.  The fluence in the 15-150 keV band is 7.4 +- 1.1 x 10^-7\nerg/cm2.\nThe 1-sec peak photon flux measured from T-0.268 sec in the 15-150 keV band\nis 2.4 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.\n\nBecause the burst seems to be similar to short GRBs with extended emission,\nwe perform further spectral analysis for the short pulse and the extended\nemission. The short pulse from T-0.224 s to T+0.496 s (determined by the\nBayesian block analysis) is best fit by a simple power-law model.\nThe power law index of the time-averaged spectrum is 0.69 +- 0.14. The\nfluence in the 15-150 keV band is 2.5 +- 0.2 x 10^-7 erg/cm2.\nThe extended emission from T+0.496 s to T+86.704 s is best fit by a\nsimple power-law model. The power law index of the time-averaged\nspectrum is 1.78 +- 0.33.  The fluence in the 15-150 keV band is\n4.9 +- 1.0 x 10^-7 erg/cm2.\n\nThe spectral lag of the short pulse is 14 (+5, -5) ms for the 100-350 keV\nto 25-50 keV bands, and 20 (+15, -10) ms for the 50-100 keV to 15-25 keV\nbands. These values are more consistent with those of long GRBs.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/957271/BA/",
  "circularId": 27148,
  "createdOn": 1582172054000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 200219A, Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 200219A"
}