{
  "bibcode": "2021GCN.30209....1P",
  "body": "S. Poolakkil (UAH) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 14:55:58.08 UT on 5 June 2021, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 210605B (trigger 644597763 / 210605622)\nwhich was also detected by the Swift/BAT-GUANO (DeLaunay et al. 2021, GCN\n30130)\nThe Fermi GBM Final Real-time Localization (GCN 30129) is consistent with\nthe Swift position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 19\ndegrees.\n\nThe GBM light curve consists of multiple peaks followed by some\nextended emission with a duration (T90) of about 110 s (50-300 keV).\nThe time-averaged spectrum from T0-3.07 s to T0+113.66 s\nis best fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is -0.78 +/- 0.08  and\nthe cutoff energy, parameterized as Epeak, is 150 +/- 11 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(10.12 +/- 0.44)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+26.36 s in the 10-1000 keV band\nis 3.3 +/- 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": 30209,
  "createdOn": 1623445060000,
  "email": "sp0076@uah.edu",
  "subject": "GRB 210605B: Fermi GBM detection",
  "submitter": "Suraj Poolakkil at UAH  <sp0076@uah.edu>",
  "eventId": "GRB 210605B"
}