TITLE: GCN CIRCULAR NUMBER: 43834 SUBJECT: GRB 260225A: SVOM/VT optical upper limits DATE: 26/02/25 16:35:56 GMT FROM: Huali Li at at NAOC, SVOM <lhl@nao.cas.cn> H. L. Li, C. Wu, Y. N. Ma, Z. H. Yao, Y. L. Qiu, L. P. Xin, X. H. Han, J. Wang, Y. Xu, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. R. Xu, J. S. Deng, J. Y. Wei (NAOC), J. Palmerio (CEA/Irfu) and L. Zhang (IHEP) report on behalf of the SVOM/VT team. SVOM/VT performed observation with auto slew to the field of GRB 260226A triggered by SVOM/ECLAIRs (sb26022501, Ma et al., GCN 43829). The observation started at 2026-02-25T09:38:31 UTC, i.e. about 47.68 minutes post trigger in the VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously. No bright uncatalogued sources were detected within the error box of ECLAIRs (Ma et al., GCN 43829), compared to the Legacy survey catalog, down to the 3 sigma limit of VT_R ~ 22.0 mag. This non-detection is consistent with the result from COLIBRÍ (Basa et al., GCN 43830). More detailed analysis is still on going. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC), CAS. View this GCN Circular online at https://gcn.nasa.gov/circulars/43834. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...