GCN Circular 39225
Subject
GRB 250208A: Fermi GBM Final Real-time Localization
Date
2025-02-08T05:14:47Z (a month 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 05:03:59 UT on 8 Feb 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250208A (trigger 760683844.557836 / 250208211).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 191.4, Dec = -11.8 (J2000 degrees, equivalent to J2000 12h 45m, -11d 48'), with a statistical uncertainty of 6.8 degrees.
The angle from the Fermi LAT boresight is 39.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250208211/quicklook/glg_skymap_all_bn250208211.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/bn250208211/quicklook/glg_healpix_all_bn250208211.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250208211/quicklook/glg_lc_medres34_bn250208211.gif