{
  "bibcode": "2017GCN.20728....1H",
  "body": "R. Hamburg (UAH), E. Bissaldi (Politecnico & INFN Bari), and C. Meegan\n(UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 05:00:59.08 UT on 22 February 2017, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 170222A (trigger 509432464 / 170222209),\nwhich was also reported by IPN (Hurley et al. 2017, GCN 20722).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 312.10, DEC = +12.45 (J2000 degrees,\nequivalent to 20h 48m, 12d 27'), with an uncertainty\nof 3.6 degrees (radius, 1-sigma containment,\nstatistical only; there is additionally a systematic\nerror which we have characterized as a core-plus-tail model, with 90% of\nGRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg\nsystematic error. [Connaughton et al. 2015, ApJS, 216, 32] ).\n\nAlthough the GBM localization is not consistent within 3 sigma\nof the IPN localization, the GBM localization places this event\nin the same part of the sky and is the same event as that reported by IPN.\nThe angle from the Fermi LAT boresight at the GBM trigger time using\nthe IPN position is 120 degrees.\n\nThe GBM light curve shows a single multi-peaked emission episode\nwith a duration (T90) of about 1.7 s (50-300 keV).\nThe time-averaged spectrum from T0-0.64 s to T0+2.43 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff.  The power law index is -0.70 +/- 0.08 and\nthe cutoff energy, parameterized as Epeak, is 862 +/- 118 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(5.31 +/- 0.19)E-06 erg/cm^2. The 0.64-sec peak photon flux measured\nstarting from T0+1.15 s in the 10-1000 keV band\nis 17.4 +/- 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": 20728,
  "createdOn": 1487803962000,
  "email": "rkh0007@uah.edu",
  "subject": "GRB 170222A: Fermi GBM observation",
  "submitter": "Rachel Hamburg at UAH  <rkh0007@uah.edu>",
  "eventId": "GRB 170222A"
}