TITLE: GCN CIRCULAR NUMBER: 42917 SUBJECT: EP251130a: KAIT optical observations DATE: 25/12/01 09:16:17 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 EP251130a (Wu et al., GCN 42903) starting at 11:21:40 UT, 831 seconds after the burst. A set of 10x20s, 10x40s, 60x60s clear (roughly R) filter images were obtained. We clearly detected the optical afterglow (Dornic et al., GCN 42904, He et al., GCN 42914; Gupta et al., GCN 42916) in our coadd image. We measure its brightness decreased from 19.6 +/- 0.1 mag (Vega; mid time 16.45 min) to 20.2 +/- 0.2 mag (mid time of 91.03 min) with a decay index of 0.46. Additional 30x60s clear filter images were obtained the following night at a mid time of 0.89 days after the burst. The OT is still detected at 19.7 +/- 0.1 mag, indicating the OT has brightened. More follow-up observations are encouraged. View this GCN Circular online at https://gcn.nasa.gov/circulars/42917. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...