General information
GRB 260611B is reported as a likely long GRB detected at about 2026-06-11 21:32:33 UT. Fermi/GBM localized it to RA = 13.3 deg, Dec = 22.6 deg with a 2.2 deg statistical uncertainty, and the event was also detected by CALET/CGBM and SVOM/GRM.
Wavelength coverage
- Gamma-ray: Fermi/GBM triggered and localized the burst; CALET/CGBM detected it in all CGBM detectors; SVOM/GRM detected it in a routine ground search and reported spectrum and fluence.
- High-energy gamma-ray context: the burst was 88.0 deg from the Fermi LAT boresight.
- SVOM/ECLAIRs: the Fermi/GBM localization was about 121 deg from the SVOM optical axis, outside the ECLAIRs field of view.
No observations are mentioned in X-ray, ultraviolet, optical, infrared, radio, gravitational waves, or neutrinos.
Lightcurve and spectrum
- CALET/CGBM reports a multi-peaked structure starting at T+0.2 s, peaking at T+14.7 s, and ending at T+28.4 s.
- CALET/CGBM reports T90 = 24.7 +/- 0.9 s and T50 = 13.5 +/- 1.2 s in the 40-1000 keV band.
- SVOM/GRM reports multiple pulses with T90 = 26 +4/-2 s in the 15-5000 keV band.
- SVOM/GRM fits the time-averaged spectrum from T0-6 to T0+26 s with a power law index of -2.14 +/- 0.12.
- SVOM/GRM reports fluence = (1.41 +/- 0.13)E-05 erg/cm^2 in 10-1000 keV for T0-6 to T0+26 s.
Redshift
What’s special vs typical