GCN Circular 41126

The Fermi GBM team reports the detection of a likely LONG GRB

"At 08:13:44.04 UT on 20 July 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250720A (trigger 774692029/250720343).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 69.25, Dec = 23.87 (J2000 degrees, equivalent to J2000 4h 36m, +23d 52'),
with a statistical uncertainty of 9.02 degrees.

The angle from the Fermi LAT boresight is 94 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250720343/quicklook/glg_skymap_all_bn250720343.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250720343/quicklook/glg_healpix_all_bn250720343.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250720343/quicklook/glg_lc_medres34_bn250720343.gif"