{
  "eventId": "GRB 250529B",
  "bibcode": "2025GCN.40571....1F",
  "circularId": 40571,
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 10:58:24 UT on 29 May 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250529B (trigger 770209109.316756 / 250529457).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 149.1, Dec = 71.6 (J2000 degrees, equivalent to J2000 09h 56m, 71d 35'), with a statistical uncertainty of 2.9 degrees.\n\nThe angle from the Fermi LAT boresight is 121.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250529457/quicklook/glg_skymap_all_bn250529457.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/bn250529457/quicklook/glg_healpix_all_bn250529457.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250529457/quicklook/glg_lc_medres34_bn250529457.gif\n",
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "submittedHow": "email",
  "createdOn": 1748516939045,
  "subject": "GRB 250529B: Fermi GBM Final Real-time Localization"
}