{
  "subject": "GRB 261030A: Fermi GBM Detection",
  "createdOn": 1793398922668,
  "body": "A. Jameson (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 16:27:22.28 UT on 30 October 2026, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 261030A (trigger 815070447/261030686).\n\nThe on-ground calculated location, using the Fermi GBM trigger data,\nis RA = 340.59, Dec = 7.07 (J2000 degrees, equivalent to\nJ2000 22h 42m, +7d 4'), with a statistical uncertainty of 1.00 degrees.\n(radius, 1-sigma containment, statistical only; there is additionally a\nsystematic error which we have characterized as a mixture of two Gaussians,\none with a radius of 1.8 degrees (52% contribution) and one with a radius\nof 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1]).\n\nThe angle from the Fermi LAT boresight is 74 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90)\nof about 37 s (50-300 keV). The time-averaged spectrum\nfrom T0-2.2 to T0+48.7 s is best fit by\na Band function with Epeak = 117.9 +/- 0.8 keV,\nalpha = -1.080 +/- 0.002, and beta = -2 +/- 0.01.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.29 +/- 0.02)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+18 s in the 10-1000 keV band is 11.7 +/- 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"
  ],
  "circularId": 46120,
  "eventId": "GRB 261030A",
  "submitter": "Angus Jameson <abj0023@uah.edu>",
  "submittedHow": "web",
  "format": "text/plain"
}