{
  "body": "Matt Godwin (UAH) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 03:21:54.33 UT on 16 June 2026, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 260616A (trigger 803272919/260616140),\nwhich was also detected by Fermi-LAT ( et al. 2026, GCN 44960).\nThe Fermi GBM on-ground location is consistent with the Fermi-LAT position.\n\nThe angle from the Fermi LAT boresight is 111 degrees.\n\nThe GBM light curve consists of one long burst with a duration (T90)\nof about 69 s (50-300 keV). The time-averaged spectrum\nfrom T0+0.3 to T0+74.1 s is best fit by\na Band function with Epeak = 246 +/- 1 keV,\nalpha = -0.63 +/- 0.01, and beta = -2.00 +/- 0.01.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.22 +/- 0.02)E-04 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+50 s in the 10-1000 keV band is 16.9 +/- 0.4 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/\"",
  "circularId": 44971,
  "createdOn": 1781750999488,
  "subject": "GRB 260616A: Fermi GBM Observation",
  "submitter": "Matt Godwin <msg0028@uah.edu>",
  "eventId": "GRB 260616A",
  "submittedHow": "web",
  "format": "text/plain"
}