{
  "circularId": 38806,
  "eventId": "GRB 250103A",
  "body": "A. C. Trigg (LSU), U. Pathak (IITB) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 09:57:46.56 UT on 03 January 2025, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 250103A (trigger 757591071/250103415).\nwhich was also detected by SVOM (Y. Wang et al. 2025, GCN 38787).\nThe Fermi GBM on-ground location is consistent with the SVOM/ECLAIRs position.\n\nThe angle from the Fermi LAT boresight is 28 degrees.\n\nThe GBM light curve an initial emission followed by two smaller peaks with a duration (T90)\nof about 118 s (50-300 keV). The time-averaged spectrum\nfrom T0-7.6 to T0+112.3 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -1.75 +/- 0.09 and the cutoff energy,\nparameterized as Epeak, is 33 +/- 5 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(5.5 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+4.3 s in the 10-1000 keV band is 2.8 +/- 0.2 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 32 +/- 4 keV, alpha = -1.70+/- 0.13 and beta = -2.65 +/- 0.38.\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/\"",
  "bibcode": "2025GCN.38806....1T",
  "subject": "GRB 250103A: Fermi GBM Observation",
  "submittedHow": "web",
  "createdOn": 1735939169311,
  "format": "text/plain",
  "submitter": "atrigg2@lsu.edu"
}