TITLE: GCN CIRCULAR NUMBER: 41128 SUBJECT: GRB 250721A: Fermi GBM Final Localization DATE: 25/07/21 11:11:33 GMT FROM: A. Holzmann Airasca at University of Trento and INFN Bari <a.holzmannairasca@unitn.it> The Fermi GBM team reports the detection of a likely LONG GRB "At 09:37:46.53 UT on 21 July 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250721A (trigger 774783471/250721401). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 76.94, Dec = -12.37 (J2000 degrees, equivalent to J2000 5h 7m, -12d 22'), with a statistical uncertainty of 10.20 degrees. The angle from the Fermi LAT boresight is 82 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250721401/q... The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250721401/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250721401/q..." View this GCN Circular online at https://gcn.nasa.gov/circulars/41128. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...