GCN 43609: GRB 260131A: KAIT optical observations

2026-02-03T07:55:33.094Z | rev 0 | event: GRB 260131A

WeiKang Zheng (UCB) and Alexei V. Filippenko (UCB) report on

behalf of the KAIT GRB team:


The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at

Lick Observatory, observed the field of GRB 260131A (Fermi GBM

Team, GCN 43579; Sugai et al., GCN 43580; Roberts et al., GCN 43585;

Frederiks et al., GCN 43590; Luo et al., GCN 43591; Li et al.,

GCN 43605) at ~0.914d and again at ~1.875d after the burst. A set

of clear (roughly R) filter images were obtained. We detected the

optical afterglow (Gompertz et al., GCN 43586; Lee et al., GCN 43587;

Saccardi et al., GCN 43595; García García et al., GCN 43599,

Shi et al. GCN 43601, Jayaraman et al., GCN 43606; Zhu et al.,

GCN 43607) in our coadd images and estimate the afterglow to be

17.8 +/- 0.1 and 19.2 +/- 0.2 mag (Vega) respectively.