GCN Circular 40668
Subject
GRB 250610A: Fermi GBM Final Real-time Localization
Date
2025-06-10T13:58:44Z (7 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 13:48:25 UT on 10 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250610A (trigger 771256110.581806 / 250610575).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 359.9, Dec = 65.1 (J2000 degrees, equivalent to J2000 23h 59m, 65d 05'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 0.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250610575/quicklook/glg_skymap_all_bn250610575.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/bn250610575/quicklook/glg_healpix_all_bn250610575.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250610575/quicklook/glg_lc_medres34_bn250610575.gif