TITLE: GCN CIRCULAR NUMBER: 41665 SUBJECT: GRB 250831A (SVOM trigger sb25083102): KAIT confirmation of stellar flare DATE: 25/09/03 04:11:08 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 GRB 250831A (SVOM trigger sb25083102; Xie et al., GCN 41614) starting at 09:32:33, 180 seconds after the burst. Observations were performed in 3 x 3 tiling mode, and a set of clear (roughly R) filter images were obtained. The first image covered the proposed flare star G 272-61 (Wu et al., GCN 41615; Magnani et al., GCN 41616; Xie et al., GCN 41618; Li et al., GCN 41654) was at 09:36:55, 442 seconds after the burst. Although the star was saturated in KAIT images, photometry with a large aperture clearly shows the magnitude decreased from 9.2 mag to 10.2 mag (faded by 1.0 mag) about 2 hours later. This is similar to the light curve reported by SVOM/VT, confirming this event is due to a stellar flare. View this GCN Circular online at https://gcn.nasa.gov/circulars/41665. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...