GRB 260603B
GCN Circular 44808
Subject
GRB 260603B: Fermi GBM Final Localization
Date
2026-06-03T18:16:31Z (2 days ago)
From
Eva M. Palafox at INAOE <eva.palafox@gmail.com>
Via
Web form
The Fermi GBM team reports the detection of a likely LONG GRB
"At 16:44:46.61 UT on 03 June 2026, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 260603B (trigger 802197891/260603698).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 350.27, Dec = 39.20 (J2000 degrees, equivalent to J2000 +23h 21m, +39d 12'),
with a statistical uncertainty of 3.16 degrees.
The angle from the Fermi LAT boresight is 63 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260603698/quicklook/glg_skymap_all_bn260603698.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260603698/quicklook/glg_healpix_all_bn260603698.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260603698/quicklook/glg_lc_medres34_bn260603698.gif"