General information
GRB 260529A was triggered and localized by Fermi/GBM at 02:49:57 UT on 29 May 2026 and is described as a likely long GRB. Optical follow-up includes both non-detections and a tentative transient candidate within the GBM localization region.
Wavelength coverage
- Gamma-ray: Fermi/GBM trigger and localization reported.
- Optical: MASTER-OAFA reported early upper limits; GOTO reported a new transient candidate (GOTO26fez / AT 2026nuz) with L-band detections.
No observations were mentioned in X-ray, UV, IR, radio, or TeV bands.
Lightcurve and spectrum
- GOTO L-band (400–700 nm): 17.85 ± 0.06 AB mag at +0.23 h; 17.90 ± 0.04 AB mag at +1.3 h post-trigger.
- MASTER-OAFA clear filter: limiting magnitudes 17.3 (t=666 s) and 17.5 (t=807 s) post-trigger.
Redshift
What’s special vs typical
- A new optical transient candidate is reported inside the GBM 90% region, but the authors caution it could be a Galactic transient due to proximity to the Galactic plane.