{
  "bibcode": "2022GCN.31565....1L",
  "body": "S. Lesage (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 23:00:50 UT on 09 February 2022, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 220209A (trigger 666140455/220209959)\nwhich was also detected by AGILE (A. Ursi, et al. 2022, GCN 31563)\nand GECAM (Y. Q. Zhang, et al. 2022, GCN 31564).\nThe Fermi GBM Final Real-time Localization (GCN 31561) is\nconsistent with the GECAM position.\n\nThe GBM light curve shows two bright emission episodes\nwith a duration (T90) of about 201 s (10-1000 keV).\n\nThe time-averaged spectrum for the first emission episode\nfrom T0+7.2 to T0+51.2 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.92 +/- 0.02 and the cutoff energy,\nparameterized as Epeak, is 1097 +/- 118 keV.\nThe event fluence (10-1000 keV) in this time interval is\n(3.48 +/- 0.05)E-05 erg/cm^2.\n\nThe time-averaged spectrum for the second emission episode\nfrom T0+159.7 to T0+220.2 s is also best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.95 +/- 0.02 and the cutoff energy,\nparameterized as Epeak, is 307 +/- 12 keV.\nThe event fluence (10-1000 keV) in this time interval is\n(2.6 +/- 0.04)E-05 erg/cm^2.\n\nThe 1-sec peak photon flux measured starting from T0+198.3 s\nin the 10-1000 keV band is 17.8 +/- 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": 31565,
  "createdOn": 1644511222000,
  "email": "sjl0014@uah.edu",
  "subject": "GRB 220209A: Fermi GBM Detection",
  "submitter": "Stephen Lesage at Fermi-GBM Team  <sjl0014@uah.edu>",
  "eventId": "GRB 220209A"
}