GCN Circular 40602
Subject
GRB 250602A: Fermi GBM Final Real-time Localization
Date
2025-06-02T03:14:49Z (5 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 03:04:31 UT on 2 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250602A (trigger 770526276.307432 / 250602128).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 111.7, Dec = 67.8 (J2000 degrees, equivalent to J2000 07h 26m, 67d 47'), with a statistical uncertainty of 4.9 degrees.
The angle from the Fermi LAT boresight is 111.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250602128/quicklook/glg_skymap_all_bn250602128.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/bn250602128/quicklook/glg_healpix_all_bn250602128.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250602128/quicklook/glg_lc_medres34_bn250602128.gif