{
  "bibcode": "2019GCN.23914....1B",
  "body": "S. D. Barthelmy (GSFC), J. R. Cummings (CPI),\nH. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL),\nK. L. Page (U Leicester), T. Sakamoto (AGU),\nM. Stamatikos (OSU), T. N. Ukwatta (LANL)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 190220A (trigger #889785)\n(Page et al., GCN Circ. 23908).  The BAT ground-calculated position is\nRA, Dec = 330.128, -76.669 deg which is\n  RA(J2000)  =  22h 00m 30.7s\n  Dec(J2000) = -76d 40' 10.1\"\nwith an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 46%.\n\nThe mask-weighted light curve shows a single-pulse structure that starts\nat ~T0, peaks at ~T+2 s, and ends at ~T+12 s. T90 (15-350 keV)\nis 10.0 +- 2.0 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.12 to T+11.88 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index 0.79 +- 0.77,\nand Epeak of 40.3 +- 6.7 keV (chi squared 60.03 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 8.9 +- 1.0 x 10^-7 erg/cm2\nand the 1-sec peak flux measured from T+1.88 sec in the 15-150 keV band is\n2.6 +- 0.4 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 2.03 +- 0.13 (chi squared 70.39 for 57 d.o.f.).  All the quoted errors\nare at the 90% confidence level.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/889785/BA/",
  "circularId": 23914,
  "createdOn": 1550685599000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 190220A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 190220A"
}