TITLE: GCN CIRCULAR NUMBER: 36023 SUBJECT: X-ray transient LXT240402A: AST3-3 optical upper limits DATE: 24/04/04 13:02:10 GMT FROM: Tianrui Sun at Purple Mountain Obs,CAS <trsun@pmo.ac.cn> Following the detection of LXT 240402A by Leia (Xu et al. GCN 36016) and FXT on board Einstein Probe (Jia et al. GCN 36022) , we use Antarctic Survey Telescope 3-3 at YaoAn Astronomy Observation Station (China, Yunnan) for follow-up. Our observation started on 2024-04-03T16:28:21.084 . No new optical source was detected within the error box (Jia et al. GCN 36022) down to 22.1 mag in the coadd image (total 60x180s, g-band). Our non-detection is consistent with the results from the GWAC-F50A (Xin et al., GCN 36018), MASTER (Lipunov et al. GCN 36019) limits. We thank the staff at YaoAn Astronomy Observation Station for their excellent support. View this GCN Circular online at https://gcn.nasa.gov/circulars/36023. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...