{
  "bibcode": "2025GCN.40833....1G",
  "circularId": 40833,
  "subject": "GRB250625A: Fermi GBM Observation",
  "submittedHow": "web",
  "eventId": "GRB 250625A",
  "submitter": "Matt Godwin <msg0028@uah.edu>",
  "format": "text/plain",
  "body": "Matt Godwin (UAH), O. Mukherjee (USRA) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 16:04:57.51 UT on 25 June 2025, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB250625A (trigger 772560302/250625670).\nWhich was also detected by Swift BAT/XRT (Ferro et al. 2025, GCN 40825) and SVOM/VT (Xin et al. 2025, GCN 40830).\nThe Fermi GBM on-ground location is consistent with the Swift position.\n\nThe angle from the Fermi LAT boresight is 32 degrees.\n\nThe GBM light curve consists of one strong peak and a few weaker peaks with a duration (T90)\nof about 5.4 s (50-300 keV). The time-averaged spectrum\nfrom T0-2.0 to T0+5.0 s is best fit by\na power law function with an exponential high-energy cutoff. The power law index is -1.27 +/- 0.05 and the cutoff energy, parameterized as Epeak, is 1301.00 +/- 1190.00\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.8 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0-0.13 s in the 10-1000 keV band is 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 Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "createdOn": 1750909625563
}