TITLE: GCN CIRCULAR NUMBER: 31792 SUBJECT: GRB 220325B: Fermi GBM Final Localization DATE: 22/03/26 04:17:29 GMT FROM: Joshua Wood at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 21:06:13.46 UT on 25 Mar 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220325B (trigger 669935178 / 220325879). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 267.2, Dec = +21.5 (J2000 degrees, equivalent to J2000 17h 49m, +21d 30'), with a statistical uncertainty of 11.4 degrees. The angle from the Fermi LAT boresight is 53.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220325879/quicklook/glg_skymap_all_bn220325879.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220325879/quicklook/glg_healpix_all_bn220325879.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220325879/quicklook/glg_lc_medres34_bn220325879.gif