TITLE:   GCN CIRCULAR
NUMBER:  41724
SUBJECT: GRB 250905B: Fermi GBM Final Localization
DATE:    25/09/05 11:17:13 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 08:14:40.87 UT on 05 September 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250905B (trigger 778752885/250905344).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 123.82, Dec = -19.65 (J2000 degrees, equivalent to J2000 8h 15m, -19d 38'),
with a statistical uncertainty of 11.91 degrees.

The angle from the Fermi LAT boresight is 90 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250905344/quicklook/glg_skymap_all_bn250905344.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/bn250905344/quicklook/glg_healpix_all_bn250905344.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250905344/quicklook/glg_lc_medres34_bn250905344.gif"