TITLE: GCN CIRCULAR NUMBER: 37420 SUBJECT: GRB 240905E: Gaoyazi/GOT optical upper limits DATE: 24/09/07 11:11:06 GMT FROM: Dong Xu at NAOC/CAS <dxu@nao.cas.cn> S.Y. Fu, J. An, S.Q. Jiang, X. Liu, Z.P. Zhu, D. Xu (NAOC) report on behalf of a large collaboration: We observed the field of GRB 240905E detected by Swift/BAT (Dichiara et al., GCN 37397), and SVOM/GRM (Zhang et al., GCN 37404), using the GOT-0.5m telescope located at Gaoyazi, Xinjiang, China. Observations started at 18:26:46 UT on 2024-09-05, i.e., 43 s after the Swift/BAT trigger, and a series of frames were obtained in the Sloan r- and z-filter. No optical source is detected in our stacked image at the refined Swift/XRT position (Ferro et al., GCN 37406), down to the 5-sigma limiting magnitudes of r > 19.9 mag (AB) at 0.32 hr post-burst and z > 18.7 mag at 2.55 hr post-burst, 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/37420. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...