GCN Circular 44321
Subject
EP260416a: KAIT optical upper limit
Event
Date
2026-04-17T06:10:43Z (6 days 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 EP260416a (Hu et al.,
GCN 44307) starting at 05:36, Apr 16 UT, about 7.2 minutes after
the burst. A set of 20s, 40s and 60s clear (roughly R) filter
images were obtained. In our coadd image, we did not detect the
OT (Ducoin et al., GCN 44310; Li et al., GCN 44315; Hua et al.,
GCN 44318; Lee et al., GCN 44319) down to a limiting mag of 21.0
mag (Vega) at a mid-time of 1.3 hours after the burst. Our result
is consistent with the OT reported at a fatiner magnitude by COLIBRÍ
at a similar time (Ducoin et al., GCN 44310).