GCN Circular 43083
Subject
EP251212a: KAIT optical upper limit
Event
Date
2025-12-13T09:04:48Z (a day ago)
From
Weikang Zheng at UC Berkeley <weikang@berkeley.edu>
Via
email
WeiKang Zheng (UCB), Xuhui Han (NAOC), Pinpin Zhang (NAOC) 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 EP251212a (Yang et al.,
GCN 43076; Salunke et al., GCN 43082) starting at 11:09, Dec 12 UT,
about 4.95 hours after the burst. A set of 38x60s clear (roughly R)
filter images were obtained. In our coadd image, we did not detect
any new source within the EP-FXT error circle (Yang et al., GCN
43081) down to a limiting mag of 21.2 mag (Vega) at a mid-time of
5.57 hours after the burst. Our result is consistent with the upper
limit reported from COLIBRÍ observations (Ducoin et al., GCN 43077).