GRB 260312B

General information

GRB 260312B is a likely long-duration GRB triggered by Fermi/GBM at 2026-03-12 09:46:46 UT, with subsequent gamma-ray confirmations by multiple instruments.

Wavelength coverage

• Gamma-ray / hard X-ray: Detected by Fermi/GBM; Glowbug reports ~43 sigma detection and 12.3 s duration; AstroSat CZTI detects it in 20–200 keV (and faintly in 100–500 keV veto); GRID-11B reports T90 in 30–2000 keV.
• Optical: MASTER-Kislovodsk reports clear-band upper limits of ~16.1–16.8 mag at ~2.44e4 s after trigger. No observations are mentioned in radio, infrared, ultraviolet, or soft X-rays.

Lightcurve and spectrum

Redshift

What’s special vs typical