TITLE:   GCN CIRCULAR
NUMBER:  42964
SUBJECT: EP251202a/GRB 251202A: KAIT optical observations
DATE:    25/12/02 20:38:22 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 EP251202a/GRB 251202A

(Zhang et al., GCN 42937; Liang et al., GCN 42946; Fermi GBM team,

GCN 42933; Bala et al., GCN 42957) from 6.29 to 10.59 hours

after the burst. A set of 60s clear (roughly R) filter images

were obtained. We clearly detected the optical afterglow (Li

et al., GCN 42934; Zhu et al., GCN 42939; O’Neill et al., GCN

42947; Quirola-Vasquez et al., GCN 42948; Kuin et al., GCN 42956)

in our coadd images. We measure its brightness decayed from

18.7 +/- 0.1 mag (Vega; mid time 6.30 hours) to 19.3 +/- 0.2 mag

(mid time of 10.55 hours) with a power-law decay index of 1.07.