TITLE: GCN CIRCULAR NUMBER: 41349 SUBJECT: EP250812a: Nickel optical upper limit DATE: 25/08/13 18:18:02 GMT FROM: Weikang Zheng at UC Berkeley weikang@berkeley.edu

Andreas Betz, Riley Patlak, WeiKang Zheng and Alex Filippenko

(UC Berkeley) report on behalf of the KAIT GRB team:

We observed the field of EP250812a (Zhang et al., GCN 41327)

with the 1-m Nickel telescope located at Lick observatory,

California. Observations were performed in the R band with

600s x 5 exposures. In our coadd image, we do not detect the

optical counterpart (Xin et al., GCN 41340; Ducoin et al.,

GCN 41342) with an upper limit of R > 20.7 (Vega) at a

mid-time of 23.8 hours after the trigger.

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