{
  "bibcode": "2017GCN.20706....1R",
  "body": "O.J. Roberts (USRA/NASA), M. Stanbro and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 00:03:07.12 UT on February 19th 2017, the Fermi\nGamma-Ray Burst Monitor triggered and located\nGRB 170219A (trigger 509155392 / 170219002), which\nwas also detected by Konus-Wind\n(Frederiks et al. 2017, GCN 20703) and for which a\ntriangulated position was reported by IPN\n(Svinkin et al. 2017, GCN 20702). The GBM localisation \nis within about 2.5-sigma of the triangulated IPN position.\n\nThe initial angle from the Fermi-LAT boresight to the GBM\nground-location using the centre of the IPN triangulated\nposition is 133 degrees.\n\nThe GBM light curve shows a bright, short burst a duration\n(T90) of about 0.08 s (50-300 keV). The time-averaged spectrum\nfrom T0-0.03 s to T0+0.05 s is best fit by a power law function\nwith an exponential high-energy cutoff.  The power law index is\n-0.59 +/- 0.10 and the cutoff energy, parameterized as Epeak\nis 1165 +/- 182 keV\n\nA Band function fits the spectrum equally well with\nalpha= -0.56 +/- 0.11, beta= -3.25 +/- 1.19 and Epeak\nis 1093 +/- 202 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(9.52 +/- 0.49)E-07 erg/cm^2. The 64 ms peak photon flux\nmeasured starting from T0+0 s in the 10-1000 keV band is\n29.4 +/- 1.9 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 20706,
  "createdOn": 1487538526000,
  "email": "oliver.roberts@nasa.gov",
  "subject": "GRB 170219A: Fermi GBM observation",
  "submitter": "Oliver J Roberts at USRA/NASA  <oliver.roberts@nasa.gov>",
  "eventId": "GRB 170219A"
}