{
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "bibcode": "2025GCN.40501....1F",
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 10:36:02 UT on 20 May 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250520B (trigger 769430167.408886 / 250520442).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 100.6, Dec = 68.7 (J2000 degrees, equivalent to J2000 06h 42m, 68d 42'), with a statistical uncertainty of 4.3 degrees.\n\nThe angle from the Fermi LAT boresight is 21.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250520442/quicklook/glg_skymap_all_bn250520442.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250520442/quicklook/glg_healpix_all_bn250520442.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250520442/quicklook/glg_lc_medres34_bn250520442.gif\n",
  "submittedHow": "email",
  "circularId": 40501,
  "createdOn": 1747737999615,
  "eventId": "GRB 250520B",
  "subject": "GRB 250520B: Fermi GBM Final Real-time Localization"
}