{
  "bibcode": "2023GCN.33531....1D",
  "body": "S. Dalessi (UAH) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 14:54:47.43 UT on 28 March 2023, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 230328B (trigger 701708092 / 230328621),\nwhich was also detected by the Swift/BAT (J.D. Gropp et al. 2023, GCN 33527)\nThe GBM on-ground location is consistent with the Swift position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 38 degrees.\n\nThe GBM light curve consists of a single burst\nwith a duration (T90) of about 19 s (50-300 keV).\nThe time-averaged spectrum from T0-3.5 s to T0+19.1 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff.  The power law index is -1.16 +/- 0.03 and\nthe cutoff energy, parameterized as Epeak, is 169.6 +/- 9.9 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(9.4 +/- 0.3)E-06 erg/cm^2. The 1 sec peak photon flux measured\nstarting from T0+1.4 s in the 10-1000 keV band\nis 12.7 +/- 0.3 ph/s/cm^2.\n\nA Band function fits the spectrum equally well with Epeak = 125.0 +/- 11.3 keV,\nalpha = -1.03 +/- 0.06, and beta = -2.10+/- 0.09.\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": 33531,
  "createdOn": 1680043825000,
  "email": "sd0104@uah.edu",
  "subject": "GRB 230328B: Fermi GBM observation",
  "submitter": "Sarah Dalessi at UAH  <sd0104@uah.edu>",
  "eventId": "GRB 230328B"
}