General information
GRB 260507A is reported as a likely long GRB, triggered by Fermi/GBM on 2026-05-07 20:28:00 UT with an on-ground localization at RA=287.5 deg, Dec=-21.3 deg (J2000) and 2.4 deg statistical uncertainty. Independent gamma-ray detections are also reported by GRID-09 and MASS-Cube, and an optical counterpart was detected by SVOM/VT.
Wavelength coverage
- Gamma-ray: Detected by Fermi/GBM; also detected by GRID-09 and MASS-Cube with reported T90 values.
- X-ray: Optical follow-up is described as responding to an Einstein Probe X-ray transient designation EP260507a.
- Optical: SVOM/VT detections in VT_B (400–650 nm) and VT_R (650–1000 nm).
No radio, IR, UV, or TeV observations are mentioned in the provided circulars.
Lightcurve and spectrum
- SVOM/VT (AB mags, not extinction-corrected): at 1.35 h post-trigger VT_B=21.92±0.12 and VT_R=20.91±0.08; at 2.96 h VT_B=22.29±0.14 and VT_R=21.25±0.10.
- Duration estimates: MASS-Cube reports T90 ≈ 19.3±3.2 s (50–10000 keV); GRID reports T90 ≈ 12.1±2.8 s (30–2000 keV).
Redshift
What’s special vs typical