GCN Circular 40788
Subject
GRB 250619B: Fermi GBM Final Real-time Localization
Date
2025-06-19T23:46:58Z (3 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 23:36:17 UT on 19 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250619B (trigger 772068982.168064 / 250619984).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 25.4, Dec = -24.8 (J2000 degrees, equivalent to J2000 01h 41m, -24d 48'), with a statistical uncertainty of 13.4 degrees.
The angle from the Fermi LAT boresight is 48.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250619984/quicklook/glg_skymap_all_bn250619984.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/bn250619984/quicklook/glg_healpix_all_bn250619984.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250619984/quicklook/glg_lc_medres34_bn250619984.gif