TITLE: GCN CIRCULAR NUMBER: 40401 SUBJECT: EP250508a: KAIT optical upper limit DATE: 25/05/08 18:38:55 GMT FROM: Weikang Zheng at UC Berkeley weikang@berkeley.edu
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 EP250508a (Liang et al.,
GCN 40390) starting at 06:17, May 08 UT, about 14 minutes after
the burst. A set of clear (roughly R) filter images were obtained.
Preliminary analysis do not reveal any new optical counterpart
candidate within the X-ray afterglow error circles (Liang et al.,
GCN 40390; Zhao et al., GCN 40399). Due to the bright moonlight,
our image quality are degraded and we estimate the limiting
magnitude of our single image to be ~17.0 mag, shallower than the
upper limit reported by other groups (Ugarte Postigo et al., GCN
40391; Lipunov et al., GCN 40393; Brivio et al., GCN 40395).
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