GCN Circular 41964
Subject
GRB 250924B: Fermi GBM Final Localization
Event
Date
2025-09-24T13:25:19Z (8 days ago)
From
Padraig McDermott at University College Dublin <padraig.mcdermott@ucdconnect.ie>
Via
Web form
The Fermi GBM team reports the detection of a likely SHORT GRB
"At 10:26:58.90 UT on 24 September 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB250924B (trigger 780402423/250924435).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 306.44, Dec = -61.82 (J2000 degrees, equivalent to J2000 20h 25m, -61d 49'),
with a statistical uncertainty of 9.50 degrees.
The angle from the Fermi LAT boresight is 150 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250924435/quicklook/glg_skymap_all_bn250924435.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/bn250924435/quicklook/glg_healpix_all_bn250924435.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250924435/quicklook/glg_lc_medres34_bn250924435.gif"