{
  "bibcode": "2025GCN.41473....1F",
  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\n\n\"At 16:07:47.46 UT on 21 August 2025, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 250821B (trigger 777485272/250821672).\n\nThe on-ground calculated location, using the Fermi GBM trigger data,\nis RA = 39.95, Dec = -77.13 (J2000 degrees, equivalent to J2000 2h 39m, -77d 7'),\nwith a statistical uncertainty of 1.00 degrees.\n\nThe angle from the Fermi LAT boresight is 67 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250821672/quicklook/glg_skymap_all_bn250821672.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/bn250821672/quicklook/glg_healpix_all_bn250821672.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250821672/quicklook/glg_lc_medres34_bn250821672.gif\"",
  "submitter": "Jacob Smith at Fermi-GBM Team <jrs0118@uah.edu>",
  "eventId": "GRB 250821B",
  "format": "text/plain",
  "submittedHow": "web",
  "createdOn": 1755802829165,
  "circularId": 41473,
  "subject": "GRB 250821B: Fermi GBM Final Localization of a Bright Burst"
}