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. View this GCN Circular online at https://gcn.nasa.gov/circulars/42964. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...