{
  "bibcode": "2021GCN.29637....1L",
  "body": "S. Lesage (UAH), A. von Kienlin (MPE), and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 09:32:14.42 UT on 06 March 2021, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 210306B (trigger 636715939 / 210306397)\nwhich was also detected by the Swift/BAT (Ambrosi et al. 2021, GCN 29601).\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 37\ndegrees.\n\nThe GBM light curve shows a single-peaked structure\nwith a duration (T90) of about 15 s (50-300 keV).\nThe time-averaged spectrum from T0-1.3 s to T0+14.1 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is -1.0 +/- 0.2 and\nthe cutoff energy, parameterized as Epeak, is 73 +/- 8 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.3 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+1.0 s in the 10-1000 keV band\nis 2.7 +/- 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": 29637,
  "createdOn": 1615310026000,
  "email": "sjl0014@uah.edu",
  "subject": "GRB 210306B: Fermi GBM detection",
  "submitter": "Stephen Lesage at Fermi-GBM Team  <sjl0014@uah.edu>",
  "eventId": "GRB 210306B"
}