TITLE:   GCN CIRCULAR
NUMBER:  41715
SUBJECT: GRB 250905A: KAIT optical upper limit
DATE:    25/09/05 04:51:12 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 Swift GRB 250905A (Brivio

et al., GCN 41714) starting at 03:14 UT, ~64 minutes after the burst.

A set of 34x60s clear (roughly R) filter images were obtained under

twilight condition. We do not detect any new optical counterpart

candidate within the XRT error circles (Brivio et al., GCN 41714),

down to an upper limit of about 20.0 (Vega) mag at a mid time of

94 minutes after the burst.