GCN Circular 41715
Subject
GRB 250905A: KAIT optical upper limit
Event
Date
2025-09-05T04:51:12Z (6 days ago)
From
Weikang Zheng at UC Berkeley <weikang@berkeley.edu>
Via
email
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.