General information
SVOM/ECLAIRs reports an offline targeted-search detection of GRB 260518B at 2026-05-18T07:53:22 UTC with a soft/X-ray-flash-like spectrum and a multi-peaked lightcurve. The ECLAIRs localization (RA=299.003 deg, Dec=-48.620 deg; 90% radius 11.1 arcmin) is reported as consistent with EP 260518a and optical transient AT 2026ndp.
Wavelength coverage
- X-ray/gamma-ray: SVOM/ECLAIRs detection with spectrum and fluence/flux reported in 4–120 keV.
- Optical: AT 2026ndp mentioned as a positional match (afterglow phase suggested).
- X-ray: EP 260518a mentioned as a positional match (afterglow phase suggested).
No observations are mentioned for radio, infrared, ultraviolet, or TeV.
Lightcurve and spectrum
Redshift
- z = 2.28 (from other circular (attributed))
- This circular assumes z=2.28 from Corcoran et al., GCN 44695 for rest-frame estimates; no measurement details given here.
What’s special vs typical