GCN Circular 41724
Subject
GRB 250905B: Fermi GBM Final Localization
Event
Date
2025-09-05T11:17:13Z (4 days ago)
From
A. Holzmann Airasca at University of Trento and INFN Bari <a.holzmannairasca@unitn.it>
Via
Web form
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"