GCN Circular 42427
Subject
GRB 251022A: KAIT optical observations
Event
Date
2025-10-24T18:47:18Z (6 days ago)
From
Weikang Zheng at UC Berkeley <weikang@berkeley.edu>
Via
email
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.