TITLE:   GCN CIRCULAR
NUMBER:  43025
SUBJECT: EP-WXT trigger 01709249380: KAIT confirmation of a stellar flare
DATE:    25/12/07 22:39:57 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

01709249380 (Li et al. GCN 43021) starting at 09:30 UT, about 11

minutes after the trigger. A set of clear (roughly R) filter images

were obtained and lasted for ~2 hours. We performed the photometry

on the suggested flare star 2MASS J05100460-0428037 and see its

brightness decreased from ~10.8 mag to ~11.2 mag in about 15 minutes,

then remained ~11.2 mag afterward, thus confirming the EP X-ray

trigger is related to the stellar flare. Our result also confirms

the observations from Perez-Garcia et al. (GCN 43022) who reported

similar decrease in mag from the flare star.