GCN Circular 42044

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

"At 20:59:58.57 UT on 30 September 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250930A (trigger 780958803/250930875).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 336.97, Dec = -44.97 (J2000 degrees, equivalent to J2000 22h 27m, -44d 58'),
with a statistical uncertainty of 3.27 degrees.

The angle from the Fermi LAT boresight is 109 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250930875/quicklook/glg_skymap_all_bn250930875.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/bn250930875/quicklook/glg_healpix_all_bn250930875.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250930875/quicklook/glg_lc_medres34_bn250930875.gif"