GCN Circular 41343

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

"At 01:46:03.86 UT on 13 August 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250813A (trigger 776742368/250813074).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 355.90, Dec = 57.28 (J2000 degrees, equivalent to J2000 23h 43m, +57d 16'),
with a statistical uncertainty of 3.06 degrees.

The angle from the Fermi LAT boresight is 19 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250813074/quicklook/glg_skymap_all_bn250813074.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/bn250813074/quicklook/glg_healpix_all_bn250813074.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250813074/quicklook/glg_lc_medres34_bn250813074.gif"