{
  "circularId": 35778,
  "bibcode": "2024GCN.35778....1M",
  "body": "J. Mangan (CNRS/IJCLab) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 08:51:31.47 UT on 22 February 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240222A (trigger 730284696/240222369).\nwhich was also detected by Swift BAT (P. D'Avanzo et al. 2024, GCN 35770).\nThe Fermi GBM on-ground location is consistent with the Swift BAT position.\n\nThe angle from the Fermi LAT boresight is 109 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90)\nof about 3.8 s (50-300 keV). The time-averaged spectrum\nfrom T0-5.9 to T0+3.3 s is best fit by\na simple power law function with index -1.4 +/- 0.1.\n\nThe event fluence (10-1000 keV) in this time interval is\n(9.2 +/- 1.9)E-07 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0-0.19 s in the 10-1000 keV band is 4 +/- 0.7 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 Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "submittedHow": "web",
  "eventId": "GRB 240222A",
  "createdOn": 1708645177752,
  "submitter": "Joe Mangan at IJCLab <joseph.mangan@ijclab.in2p3.fr>",
  "subject": "GRB 240222A: Fermi GBM Observation"
}