TITLE: GCN CIRCULAR NUMBER: 40220 SUBJECT: EP250421a: Nickel optical upper limit DATE: 25/04/23 23:13:36 GMT FROM: Weikang Zheng at UC Berkeley weikang@berkeley.edu
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.
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