TITLE: GCN CIRCULAR NUMBER: 45184 SUBJECT: GRB 260718A: LCO optical upper limits DATE: 26/07/18 19:44:16 GMT FROM: SVOM_group <svomgroup@bao.ac.cn> D. Turpin, A. Saccardi (CEA/Irfu), S.-J. Yin (GXU), C. Wu, L.-P. Xin (NAOC), W. Zhang (PMO), Y. Ma (NAOC) report on behalf of the SVOM mission team: We observed the field of GRB 260718A detected by SVOM (Antier et al., GCN 45177) and Fermi/GBM (Holzmann Airasca et al., GCN 45181) with the LCO 1m telescope at the Siding Spring Observatory (SAAO) equipped with the Sinistro instrument. Our observation started at 2026-07-18T18:35:32 about 7.3 hours after the SVOM/ECLAIRs trigger time. We obtained 3x200 s exposures in the PanSTARRS z filters. No any uncatalogued source was identified in our stacked frames in the ECLAIRs localisation region as also reported by SVOM/VT (Ma et al., GCN 45178; Li et al., GCN 45179) and GRANDMA/KNC (Jacquesson et al., GCN 45180) . We measure the following upper limits (5 sigma) calibrated against the SkyMapper DR4 catalog, and not corrected for Galactic extinction: z = 20.1 (AB) T_mid - T0 = 7.4hr This project is funded by the SVOM collaboration. View this GCN Circular online at https://gcn.nasa.gov/circulars/45184. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...