GCN Circular 41380
Subject
GRB 250814A: KAIT optical upper limit
Event
Date
2025-08-14T22:30:47Z (4 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 GRB 250814A (Fermi GBM
team, GCN 41357; Caputo et al., GCN 41358) starting at 07:50:38,
Aug. 14 UT, 939 seconds after the burst. A set of 120x60s clear
(roughly R) filter images were obtained. Preliminary analysis
do not reveal any new optical counterpart candidate within the
Swift/XRT error circles (Caputo et al., GCN 41358), neither in
single image, nor in the co-add images. Also no object was found
at the afterglow candidate position reported by Karambelkar et al.
(GCN 41377). Our upper limit is about 21.5 (Vega) mag at a mid
time of 1.27 hours after the burst. Our result is consistent with
the upper limit reported by other groups (Becerra et al., GCN 41362;
Postigo et al., GCN 41367; Karambelkar et al., GCN 41372; Salazar
et al., GCN 41375).