{
  "bibcode": "2019GCN.23921....1F",
  "body": "C. Fletcher (USRA) and C. Meegan (UAH)\r\nreport on behalf of the Fermi GBM Team:\r\n\r\n\"At 20:15:31.49 UT on 20 February 2019, the Fermi Gamma-Ray Burst Monitor\r\ntriggered and located GRB 190220B (trigger 572386536 / 190220844).\r\n\r\nwhich was also detected by INTEGRAL (Gotz et al. 2019, GCN 23915).\r\nThe GBM on-ground location is consistent with the INTEGRAL position.\r\n\r\nThe angle from the Fermi LAT boresight at the GBM trigger time is 23 degrees.\r\n\r\nThe GBM light curve consists of multiple peaks\r\nwith a duration (T90) of about 109 s (50-300 keV).\r\nThe time-averaged spectrum from T0-51.201 s to T0+59.393 s is\r\nwell fit by a power law function with an exponential\r\nhigh-energy cutoff.  The power law index is -1.4 +/- 0.1 and\r\nthe cutoff energy, parameterized as Epeak, is 83 +/- 8 keV\r\n\r\nThe event fluence (10-1000 keV) in this time interval is\r\n(7.2 +/- 0.6)E-06 erg/cm^2. The 1-sec peak photon flux measured\r\nstarting from T0+38.72 s in the 10-1000 keV band\r\nis 2.5 +/- 0.2 ph/s/cm^2.\r\n\r\nA Band function fits the spectrum equally well\r\nwith Epeak= 73 +/- 13 keV, alpha = -1.3 +/- 0.2 and beta = -2.5 +/- 0.4.\r\n\r\n\r\nThe spectral analysis results presented above are preliminary;\r\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 23921,
  "createdOn": 1550778585000,
  "email": "corinne.l.fletcher@nasa.gov",
  "subject": "GRB 190220B: Fermi GBM observation",
  "submitter": "Cori Fletcher at USRA/NASA  <corinne.l.fletcher@nasa.gov>",
  "eventId": "GRB 190220B"
}