{
  "bibcode": "2022GCN.32490....1D",
  "body": "S. Dalessi (UAH), C. Fletcher (USRA), C. Meegan (UAH), and J. Wood (NASA MFSC)\nreport on behalf of the Fermi GBM Team:\n\n\"At 01:57:48.50 UT on 25 August 2022, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 220825A (trigger 683085473 / 220825082),\nwhich was also detected by the Swift/BAT-GUANO (J. DeLaunay et al.\n2022, GCN 32483).\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 115.0 degrees.\n\nThe GBM light curve consists of a single peak burst\nwith a duration (T90) of about 14.1 s (50-300 keV).\nThe time-averaged spectrum from T0-4.1 s to T0+8.2 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff.  The power law index is -1.24 +/- 0.19 and\nthe cutoff energy, parameterized as Epeak, is 56.6 +/- 7.0 keV\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.83 +/- 0.14)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0-1.98 s in the 10-1000 keV band\nis 4.96 +/- 0.37 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 46.2 +/- 9.5 keV, alpha = -0.96 +/- 0.37 and beta = -2.48 +/- 0.32.\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/\"",
  "circularId": 32490,
  "createdOn": 1661545829000,
  "email": "sd0104@uah.edu",
  "subject": "GRB 220825A: Fermi GBM observation",
  "submitter": "Sarah Dalessi at UAH  <sd0104@uah.edu>",
  "eventId": "GRB 220825A"
}