{
  "createdOn": 1746536860418,
  "eventId": "GRB 250506A",
  "circularId": 40362,
  "bibcode": "2025GCN.40362....1S",
  "body": "R. Sonawane (IISER, TVM), S. Bala (USRA), and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 02:23:22.60 UT on 06 May 2025, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 250506A (trigger 768191007/250506100).\nwhich was also detected by SVOM/ECLAIRs (Wang et al. 2025, GCN 40358).\nThe Fermi GBM on-ground location is consistent with the SVOM/ECLAIRs position.\n\nThe angle from the Fermi LAT boresight is 116 degrees.\n\nThe GBM light curve consists of multiple emission episodes with a duration (T90)\nof about 48 s (50-300 keV). The time-averaged spectrum\nfrom T0+0.003 to T0+61.441 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -1.07 +/- 0.04 and the cutoff energy,\nparameterized as Epeak, is 280 +/- 20 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.36 +/- 0.06)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+34 s in the 10-1000 keV band is 27.4 +/- 0.5 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/\"",
  "format": "text/plain",
  "submittedHow": "web",
  "submitter": "Rushikesh Sonawane  at IISER, TVM <rushikesh23@iisertvm.ac.in>",
  "subject": "GRB 250506A: Fermi GBM Observation"
}