TITLE:   GCN CIRCULAR
NUMBER:  41873
SUBJECT: GRB 250916A: KAIT optical observations
DATE:    25/09/18 22:13:06 GMT
FROM:    Weikang Zheng at UC Berkeley <weikang@berkeley.edu>

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 250916A (Fermi GBM

team, GCN 41839; Arya et al., GCN 41843; Cheung et al., GCN 41855;

Waratkar et al., GCN 41871) starting at ~0.783d and again at ~1.738d

after the burst. A set of clear (roughly R) filter images were

obtained. We clearly detected the optical afterglow (Belkin et al.,

GCN 41847; Mohan et al., GCN 41858; Moskvitin et al., GCN 41859;

Burkhonov et al., GCN 41860; de Ugarte Postigo et al., GCN 41863;

Moskvitin et al., GCN 41870) in our coadd images. We estimate the

afterglow to be 19.35 +/- 0.1 and 20.10 +/- 0.1 mag (Vega) at a mid

time of ~0.824d and ~1.807d respectively.