GCN Circular 40794
Subject
GRB 250620C: Fermi GBM Final Real-time Localization
Date
2025-06-20T16:18:37Z (2 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 16:07:09 UT on 20 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250620C (trigger 772128434.916854 / 250620672).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 142.6, Dec = 55.0 (J2000 degrees, equivalent to J2000 09h 30m, 55d 00'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 124.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250620672/quicklook/glg_skymap_all_bn250620672.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/bn250620672/quicklook/glg_healpix_all_bn250620672.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250620672/quicklook/glg_lc_medres34_bn250620672.gif