GCN Circular 43027
Subject
GRB 251208A: Fermi GBM Final Real-time Localization
Event
Date
2025-12-08T09:36:35Z (4 days ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely SHORT GRB
At 09:25:57 UT on 8 Dec 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251208A (trigger 786878762.38767 / 251208393).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 32.8, Dec = -66.7 (J2000 degrees, equivalent to J2000 02h 11m, -66d 42'), with a statistical uncertainty of 3.9 degrees.
The angle from the Fermi LAT boresight is 56.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251208393/quicklook/glg_skymap_all_bn251208393.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/bn251208393/quicklook/glg_healpix_all_bn251208393.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251208393/quicklook/glg_lc_medres34_bn251208393.gif