{
  "circularId": 39391,
  "bibcode": "2025GCN.39391....1F",
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 23:50:24 UT on 20 Feb 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250220B (trigger 761788229.197974 / 250220993).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 39.3, Dec = 45.6 (J2000 degrees, equivalent to J2000 02h 37m, 45d 36'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 3.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250220993/quicklook/glg_skymap_all_bn250220993.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/bn250220993/quicklook/glg_healpix_all_bn250220993.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250220993/quicklook/glg_lc_medres34_bn250220993.gif\n",
  "createdOn": 1740096055190,
  "eventId": "GRB 250220B",
  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
  "submittedHow": "email",
  "subject": "GRB 250220B: Fermi GBM Final Real-time Localization"
}