GCN Circular 41296
Subject
GRB 250808A: Fermi GBM Final Real-time Localization
Event
Date
2025-08-08T18:36:39Z (20 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 18:25:12 UT on 8 Aug 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250808A (trigger 776370317.484496 / 250808768).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 62.8, Dec = -16.8 (J2000 degrees, equivalent to J2000 04h 11m, -16d 48'), with a statistical uncertainty of 7.1 degrees.
The angle from the Fermi LAT boresight is 33.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250808768/quicklook/glg_skymap_all_bn250808768.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/bn250808768/quicklook/glg_healpix_all_bn250808768.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250808768/quicklook/glg_lc_medres34_bn250808768.gif