General information
GRB 260602B is reported as a likely short GRB detected by Fermi GBM at 2026-06-02 22:41:31.26 UT, with an on-ground GBM position of RA 187.55 deg and Dec -16.61 deg. A later Avion/DeCoR-1 report independently detected the same short event in gamma rays.
Wavelength coverage
- Gamma-ray: Fermi GBM detected and localized the burst; Avion/DeCoR-1 detected 24 photons above 40 keV and reports measurements in 40-500 keV.
- Optical: MASTER-OAFA and MASTER-OAGH inspected the GBM error box and reported upper limits up to 20.0 mag and 17.3 mag, respectively.
No observations are mentioned in radio, X-ray, neutrino, gravitational-wave, or confirmed GeV LAT detection bands.
Lightcurve and spectrum
- Avion reports a single gamma-ray episode of about 0.5 s duration.
- Avion reports T90 of about 0.5 s.
- Avion reports fluence of about 1.1*10^(-7) erg/cm^2 in 40-500 keV.
- Avion reports maximum flux of about 2.3 phot/(cm^2*s).
- MASTER optical observations report non-detections with limiting magnitudes, including coadded limits up to 19.8 mag in the listed table and a stated upper limit up to 20.0 mag.
Redshift
What’s special vs typical
The event is a short GRB with independent gamma-ray detection by a cubesat instrument, but the provided circulars do not report a counterpart, redshift, afterglow, host association, or multi-messenger link.