TITLE:   GCN CIRCULAR
NUMBER:  37733
SUBJECT: EP trigger ID 01709065118: KAIT confirmation of the stellar flare
DATE:    24/10/08 04:14:48 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, automatically responded to the EP-WXT trigger

(ID= 01709065118; Zhou et al., GCN 37715) starting at 05:49 UT,

Oct. 05th, ~8 minutes after the trigger. A set of images with 20s

exposure time were obtained in B, V, R I and clear (roughly R)

filters. Observations lasted for about 5 hours. The flare star

1RXS J225817.2-110434, reported by Zhou et al. (GCN 37715) to be

within EP-FXT error circle, was covered by KAIT images. Photometry

of the star show that its brightness decreased from the start of

our observation in all filters, especially in B band which

decreased by 0.6 mag. The light curves became flat after about 1.5

hours after trigger in all bands. We therefore confirm that this

EP-WXT trigger event is truly associated with this stellar flare.