TITLE:   GCN CIRCULAR
NUMBER:  40788
SUBJECT: GRB 250619B: Fermi GBM Final Real-time Localization
DATE:    25/06/19 23:46:58 GMT
FROM:    Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>

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