TITLE: GCN CIRCULAR NUMBER: 38328 SUBJECT: LIGO/Virgo/KAGRA S241125n: Gaoyazi/GOT optical observations DATE: 24/11/26 16:22:50 GMT FROM: Dong Xu at NAOC/CAS <dxu@nao.cas.cn> S.Q. Jiang, X. Liu, S.Y. Fu, J. An, Z.P. Zhu, D. Xu (NAOC) report on behalf of a large collaboration: We observed the field of the Swift/BAT-GUANO candidate counterpart (DeLaunay et al., GCN 38308) of the LIGO/Virgo/KAGRA gravitational wave event S241125n (LIGO/Virgo/KAGRA, GCN 38305; GCN 38309; GCN 38312; GCN 38313) using the GOT-0.5m telescope located at Gaoyazi, Xinjiang, China. Observations started at 18:49:17 UT on 2024-11-25, i.e., 17.796 hr after the S241125n trigger, and we obtained 32 x 180 s frames in the Sloan r filter. No new optical source is detected in our stacked image within the Swift/BAT-GUANO 5 arcmin 50% containment area via cross-match with the PanSTARRS catalog, down to the 5-sigma limiting magnitude of r > 20.6, calibrated with nearby PanSTARRS stars and not corrected for Galactic extinction. We acknowledge the excellent support from L.F. Huo and M.M. Yang for enabling these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/38328. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...