{
  "circularId": 45467,
  "submitter": "Christian Malacaria at INAF-OAR <cmalacaria.astro@gmail.com>",
  "submittedHow": "web",
  "eventId": "GRB 260829A",
  "body": "C. Malacaria (INAF-OAR) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 06:08:09.39 UT on 29 August 2026, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 260829A (trigger 809676494/260829256).\nThe Final real-time localization was reported in GCN 45464.\n\nThe GBM light curve consists of a prompt emission followed by a bright peak with a duration (T90)\nof about 26.4 s (50-300 keV). The time-averaged spectrum\nfrom T0+18 to T0+34 s is best fit by\na Band function with Epeak = 260 +/- 10 keV,\nalpha = -0.66 +/- 0.04, and beta = -2.17 +/- 0.08.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.91 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+22 s in the 10-1000 keV band is 19.1 +/- 0.3 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/\"",
  "eventType": [
    "GRB",
    "Gamma-ray Transient"
  ],
  "format": "text/markdown",
  "createdOn": 1788012743745,
  "subject": "GRB 260829A: Fermi GBM Detection"
}