GCN Circular 43030
Subject
GRB 251208C: Fermi GBM Final Real-time Localization
Event
Date
2025-12-08T13:03:09Z (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 12:52:32 UT on 8 Dec 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251208C (trigger 786891157.548312 / 251208536).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 312.8, Dec = -30.7 (J2000 degrees, equivalent to J2000 20h 51m, -30d 41'), with a statistical uncertainty of 4.8 degrees.
The angle from the Fermi LAT boresight is 84.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251208536/quicklook/glg_skymap_all_bn251208536.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/bn251208536/quicklook/glg_healpix_all_bn251208536.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251208536/quicklook/glg_lc_medres34_bn251208536.gif