GCN Circular 40220
Subject
EP250421a: Nickel optical upper limit
Date
2025-04-23T23:13:36Z (7 hours ago)
From
Weikang Zheng at UC Berkeley <weikang@berkeley.edu>
Via
email
Katherine Mora, Eyouel Abate, Ansel Parke, WeiKang Zheng
and Alex Filippenko (UC Berkeley) report on behalf of the
KAIT GRB team:
We observed the field of EP250421a (Zhao et al., GCN 40198)
with the 1-m Nickel telescope located at Lick observatory,
California. Observations were performed in the R band with
600s x 6 exposures. In our coadd image, we do not detect the
optical afterglow (Lee et al., GCN. 40192; Fu et al., GCN
40193; Liu et al., GCN 40197), with an upper limit of R >
20.5 (Vega) at a mid-time of 14.9 hours after the trigger.