{
  "bibcode": "2023GCN.33353....1V",
  "body": "P. Veres (UAH) reports on behalf of the Fermi GBM Team:\n\n\"At 21:53:10.69 UT on 17 February 2023, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 230217A (trigger 698363595 / 230217912).\nwhich was also detected by the Swift/BAT (Moss et al., GCN 33339),\nAGILE (Casentini et al., GCN 33343), CALET-GBM (Torii et al., GCN\n33342) and Konus-Wind (Svinkin et al., GCN 33349). The GBM on-ground\nlocation is consistent with the Swift position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 58 degrees.\n\nThe GBM light curve consists of a single pulse\nwith a duration (T90) of about 0.90 s (50-300 keV).\nThe time-averaged spectrum from T0s to T0+1.4 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff.  The power law index is -0.74 +/- 0.02 and\nthe cutoff energy, parameterized as Epeak, is 1497 +/- 63 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.81 +/- 0.02)E-5 erg/cm^2. The 64 ms peak photon flux measured\nstarting from T0+0.22 s in the 10-1000 keV band\nis 93.1 +/- 2.8 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 1476 +/- 79 keV, alpha = -0.74 +/- 0.02 and beta = 3.07+/-0.82.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "circularId": 33353,
  "createdOn": 1676905036000,
  "email": "veresp@gmail.com",
  "subject": "GRB 230217A: Fermi GBM observation",
  "submitter": "Peter Veres at UAH  <veresp@gmail.com>",
  "eventId": "GRB 230217A"
}