GRB 260428A

General information

GRB 260428A was detected at 2026-04-28 14:20:35 UT by Fermi/GBM and confirmed by multiple high-energy instruments, with later IPN triangulation reported. Prompt-emission analyses include duration estimates of a few to several seconds and cutoff power-law spectral fits.

Wavelength coverage

Gamma-ray / hard X-ray: Detected by Fermi/GBM, AstroSat/CZTI (and Veto), GECAM-B, SVOM/GRM, Konus-Wind, Mars-Odyssey (HEND/GRS), and TERI; prompt spectra/fluences reported by GECAM-B and SVOM/GRM.
Optical: MASTER-OAGH reported only upper limits (clear/unfiltered) up to ~19.1 mag at ~0.75–0.81 days after trigger. No observations were mentioned in UV, soft X-ray, NIR, radio, TeV, neutrinos, or gravitational waves.

Lightcurve and spectrum

Redshift

What’s special vs typical

GCN 44678: GRB 260428A: TERI Gamma-ray detection

2026-05-21T14:02:09.821Z | rev 0

GCN 44678: GRB 260428A: TERI Gamma-ray detection

2026-05-21T14:02:09.821Z | rev 2

GCN 44458: IPN triangulation of GRB 260428A

2026-05-04T15:04:29.676Z | rev 0

GCN 44424: GRB 260428A: SVOM/GRM observation of a possible short burst with extended emission

2026-04-29T15:26:34.232Z | rev 0

GCN 44423: GRB 260428A: GECAM-B detection of a possible long duration Type I burst

2026-04-29T15:24:26.476Z | rev 0

GCN 44421: GRB 260428A: AstroSat CZTI detection

2026-04-29T10:52:09.106Z | rev 0

GCN 44420: Fermi GRB 260428A: Global MASTER-Net observations report

2026-04-29T09:48:02.797Z | rev 0

GCN 44415: GRB 260428A: Fermi GBM Final Real-time Localization

2026-04-28T14:31:09.939Z | rev 0