TITLE: GCN CIRCULAR NUMBER: 42427 SUBJECT: GRB 251022A: KAIT optical observations DATE: 25/10/24 18:47:18 GMT FROM: Weikang Zheng at UC Berkeley <weikang@berkeley.edu> WeiKang Zheng (UCB) 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 GRB 251022A (Fermi GBM Team, GCN 42380; Di Lalla et al., GCN 42384; DeLaunay et al., GCN 42409; Mukherjee et al., GCN 42410) starting at ~0.46d and again at ~1.39d after the burst. A set of clear (roughly R) filter images were obtained. We detected the optical afterglow (O’Neill et al. GCN 42386; Becerra et al. GCN 42394; Lipunov et al. GCN 42395; Mandarakas et al. GCN 42397; Mohan et al. GCN 42413; Méndez et al., GCN 42423) in our coadd images. We estimate the afterglow to be 19.2 +/- 0.2 and 21.6 +/- 0.3 mag (Vega) at a mid time of ~0.47d and ~1.40d respectively. View this GCN Circular online at https://gcn.nasa.gov/circulars/42427. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...