GCN Circular 43085
Subject
GRB 251214A: Fermi GBM Final Real-time Localization
Event
Date
2025-12-14T00:21:49Z (13 hours 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 LONG GRB
At 00:11:15 UT on 14 Dec 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251214A (trigger 787363880.165798 / 251214008).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 152.4, Dec = 17.9 (J2000 degrees, equivalent to J2000 10h 09m, 17d 53'), with a statistical uncertainty of 4.9 degrees.
The angle from the Fermi LAT boresight is 61.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251214008/quicklook/glg_skymap_all_bn251214008.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/bn251214008/quicklook/glg_healpix_all_bn251214008.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251214008/quicklook/glg_lc_medres34_bn251214008.gif