{
  "format": "text/plain",
  "subject": "GRB 260130A: Fermi GBM Detection",
  "bibcode": "2026GCN.43575....1J",
  "submitter": "Peter Veres at University of Alabama in Huntsville <veresp@gmail.com>",
  "eventId": "GRB 260130A",
  "submittedHow": "web",
  "createdOn": 1769836232608,
  "body": "A. Jameson (UAH), C. Meegan (UAH), and M. Dafčíková (MUNI) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 13:29:20.82 UT on 30 January 2026, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 260130A (trigger 791472565/260130562).\n\nThe on-ground calculated location, using the Fermi GBM trigger data,\nis RA = 48.70, Dec = 64.17 (J2000 degrees, equivalent to\nJ2000 3h 14m, +64d 10'), with a statistical uncertainty of 1.60 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 16 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90)\nof about 0.5 s (50-300 keV). The time-averaged spectrum\nfrom T0-0.07 to T0+0.20 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.41 +/- 0.02 and the cutoff energy,\nparameterized as Epeak, is 730 +/- 30 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(8.8 +/- 0.4)E-07 erg/cm^2. The 64-ms peak photon flux measured\nstarting from T0+0.0 s in the 10-1000 keV band is 27 +/- 1 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 570 +/- 20 keV, alpha = -0.33 +/- 0.02 and beta = -2 +/- 0.1.\n\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": 43575
}