General information
GRB 260307A is reported as a likely long GRB, first triggered by Fermi/GBM at 2026-03-07 11:27:59 UT with a final GBM localization near RA=209.07 deg, Dec=29.03 deg. The burst is independently detected/confirmed in gamma rays by CALET/CGBM, Glowbug, and GECAM-B.
Wavelength coverage
- Gamma-ray: Detected by Fermi/GBM; CALET/CGBM reports a multi-peaked light curve and durations; Glowbug confirms detection; GECAM-B reports multiple pulses and T90.
- Optical: MASTER-Kislovodsk reports only upper limits (clear/C band) to ~17.1–17.6 mag at ~5.25e4 s after trigger.
No X-ray, UV, radio, IR, or host-galaxy observations are mentioned.
Lightcurve and spectrum
Redshift
What’s special vs typical