{
  "bibcode": "2022GCN.31689....1D",
  "body": "R. Dunwoody (UCD), J. Mangan (UCD) and C.Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 11:33:20.48 UT on 05 March 2022, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 220305A (trigger 668172805 / 220305481).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 174, DEC = -34 (J2000 degrees,\nequivalent to 11 h 36 m, -34 d 00 '), with a statistical uncertainty\nof 1.5 degrees.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 35 degrees.\n\nThe GBM light curve consists of three emission episodes, the most\nprominent occurring around T0+50s, with a duration (T90) of about\n172.8 s (50-300 keV).\n\nThe time-averaged spectrum for the first emission episode, from\nT0-12.3 to T0+12.3, is best fit by a power law function with an\nexponential high-energy cutoff. The power law index is -0.6 +/- 0.5\nand the cutoff energy, parameterized as Epeak, is 60.9 +/- 9.1 keV.\nThe event fluence (10-1000 keV) in this time interval is (6.8 +/-\n0.8)E-07 erg/cm^2.\n\nThe time-averaged spectrum for the second emission episode, from\nT0+39.9 to T0+60.4, is best fit by a Band function with Epeak = 320.7\n+/- 35.7 keV, alpha = -0.9 +/- 0.1, and beta = -1.9 +/- 0.1. The event\nfluence (10-1000 keV) in this time interval is (1.78 +/- 0.03)E-05.\n\nThe time-averaged spectrum for the third emission episode, from\nT0+164.9 to T0+193.5, is best fit by a power law function with an\nexponential high-energy cutoff. The power law index is -1.3 +/- 0.1\nand the cutoff energy, parameterized as Epeak, is 205.2 +/- 42.8 keV.\nThe event fluence (10-1000 keV) in this time interval is(3.5 +/-\n0.3)E-06 erg/cm^2.\n\nThe 1-sec peak photon flux measured starting from T0+49.6 s in the\n10-1000 keV band is 19.5 +/- 0.4 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB\nCatalog:https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM\nSupport Page:https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "circularId": 31689,
  "createdOn": 1646523622000,
  "email": "joseph.mangan@ucdconnect.ie",
  "subject": "GRB 220305A: Fermi GBM observation",
  "submitter": "Joe Mangan at UCD  <joseph.mangan@ucdconnect.ie>",
  "eventId": "GRB 220305A"
}