{
  "bibcode": "2022GCN.31487....1V",
  "body": "P. Veres (UAH)\nreports on behalf of the Fermi-GBM Team:\n\n���Swift-BAT detected GRB 220117A at T0=2022-01-17T16:18:51.5 UT\n(Melandri et al, GCN 31466). There was no Fermi-GBM onboard trigger\naround the event.\n\nThe GBM targeted search [1], the most sensitive, coherent search for\nGRB-like signals was run from +/-30 s around the BAT trigger time.  A\ntransient source was identified whose most significant timescale according\nto the search is 4.096 s with a false alarm rate of 1.9e-5 Hz, and a\nlocation consistent with the Swift-BAT event, using the standard search\nprotocol with a S/N of 11.4.  The GBM targeted search event was found with\nthe highest significance with a ���soft��� spectral template (Band\nfunction with Epeak = 70 keV, alpha = -1.9, beta = -3.7).\n\nThe GBM light curve consists of multiple overlapping pulses. The\ntime-averaged spectrum from T0 + 11.7 s to T0 + 69.0 s is best fit by\na power law function with an exponential high-energy cutoff. The\npower law index is -1.39 +/- 0.20 and the cutoff energy, parameterized\nas Epeak, is 40.0 +/- 4.8 keV.\n\nThe event fluence (10-1000 keV) in this time interval for the best fitting\nmodel is (2.40 +/- 0.17)E-6 erg/cm^2. Using the redshift z=4.961 reported\nby Palmerio et al. (GCN 31480), we derive an isotropic equivalent energy in\nthe 1-10,000 keV range of (1.56 +/- 0.11)E+53 erg.\n\nThis analysis is preliminary.\n\n[1] Goldstein et al. 2019 arXiv:1903.12597\n���",
  "circularId": 31487,
  "createdOn": 1642524803000,
  "email": "veresp@gmail.com",
  "subject": "Fermi GBM Sub-Threshold Detection of GRB 220117A",
  "submitter": "Peter Veres at UAH  <veresp@gmail.com>",
  "eventId": "GRB 220117A"
}