GCN Circular 41366
Subject
GRB 250814B: Fermi GBM Final Real-time Localization
Event
Date
2025-08-14T10:32:39Z (11 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 LONG GRB
At 10:22:10 UT on 14 Aug 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250814B (trigger 776859735.510984 / 250814432).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 80.1, Dec = 24.6 (J2000 degrees, equivalent to J2000 05h 20m, 24d 36'), with a statistical uncertainty of 4.6 degrees.
The angle from the Fermi LAT boresight is 132.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250814432/quicklook/glg_skymap_all_bn250814432.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/bn250814432/quicklook/glg_healpix_all_bn250814432.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250814432/quicklook/glg_lc_medres34_bn250814432.gif