{
  "bibcode": "2022GCN.31778....1H",
  "body": "R. Hamburg (UAH) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 12:48:30.66 UT on 17 March 2022, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 220317A (trigger 669214115 / 220317534).\nwhich was also detected by the Swift/BAT-GUANO (Tohuvavohu et al. 2022, GCN\n31766).\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 48\ndegrees.\n\nThe GBM light curve shows two peaks with a duration (T90)\nof about 14 s (50-300 keV). The time-averaged spectrum\nfrom T0-6.1 s to T0+8.2 s is best fit by a power law\nfunction with an exponential high-energy cutoff.\nThe power law index is -1.1 +/- 0.2 and the cutoff\nenergy, parameterized as Epeak, is 248 +/- 96 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.2 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+4.4 s in the 10-1000 keV band\nis 1.6 +/- 0.2 ph/s/cm^2.\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\nPage:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "circularId": 31778,
  "createdOn": 1647881178000,
  "email": "rkh0007@uah.edu",
  "subject": "GRB 220317A: Fermi GBM detection",
  "submitter": "Rachel Hamburg at UAH  <rkh0007@uah.edu>",
  "eventId": "GRB 220317A"
}