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..."
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