GCN Circular 41127

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

"At 18:57:10.30 UT on 20 July 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250720B (trigger 774730635/250720790).
This trigger was initially classified as Distant Particles by the flight software,
but is in fact a GRB.

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 92.04, Dec = -80.65 (J2000 degrees, equivalent to J2000 6h 8m, -80d 39'),
with a statistical uncertainty of 5.52 degrees.

The angle from the Fermi LAT boresight is 152 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250720790/quicklook/glg_skymap_all_bn250720790.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/bn250720790/quicklook/glg_healpix_all_bn250720790.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250720790/quicklook/glg_lc_medres34_bn250720790.gif"