{
  "bibcode": "2021GCN.29388....1B",
  "body": "E. Bissaldi (Politecnico and INFN Bari)\nreports on behalf of the Fermi GBM Team:\n\n\n\"At 12:54:27.00 UT on 2 February 2021, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located a burst from SGR J1935+2154 (trigger 633963272/210202538).\nThe same burst was also reported by INTEGRAL (Ricciarini et al. 2021, GCN 29383).\n\nThe GBM on-ground location is consistent with the known position of the SGR.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 90 degrees.\n\nThe burst has a duration (T90) of about 0.1 seconds\nin the energy range 10-200 keV.\n\nThe time-averaged spectrum from T0-0.048 s to T0+0.96 s is\nadequately fit by a power law function with an exponential\nhigh-energy cutoff.  The power law index is 0.28 +/- 0.13 and\nthe cutoff energy, parameterized as Epeak, is 34.1 +/- 0.6 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(8.25 +/- 0.14)E-07 erg/cm^2.\nThe 64-ms peak photon flux measured starting from T0\nin the 10-1000 keV band is 152 +/- 5 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary.\n\nGBM will continue to monitor the source and issue GCNs for bright bursts\nfrom SGR J1935+2154 that have been observed by other instruments\nwith improved localizing capabilities, and for SGR bursts\ninitially misclassified as GRBs.\n\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": 29388,
  "createdOn": 1612372833000,
  "email": "elisabetta.bissaldi@ba.infn.it",
  "subject": "Fermi GBM Observations of a bright burst from SGR J1935+2154",
  "submitter": "Elisabetta Bissaldi at INFN,Bari  <elisabetta.bissaldi@ba.infn.it>",
  "eventId": "SGR J1935+2154"
}