TITLE: GCN CIRCULAR NUMBER: 45113 SUBJECT: GRB 260706A: SVOM/VT optical upper limits DATE: 26/07/08 09:45:48 GMT FROM: Huali Li at at NAOC, SVOM <lhl@nao.cas.cn> H. L. Li, L. P. Xin, C. Wu, Y. L. Qiu, Y. N. Ma, J. R. Xu, Z. H. Yao, X. H. Han, Y. Xu, J. Wang, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. S. Deng, J. Y. Wei (NAOC), J. Palmerio (CEA), F. Daigne (IAP) and M. Pillas (IAP) report on behalf of the SVOM/VT team. SVOM/VT performed ToO observation to GRB 260706A detected by SVOM/Eclairs (sb26070606, Alaux et al., GCN 45089; Guillot et al., GCN 45103). This burst was also detected by SVOM/GRM (Alaux et al., GCN 45089; Wang et al., GCN 45101) and Fermi/GBM (the Fermi GBM team, GCN 45088; Trigg et al., GCN 45093). The observation started at 2026-07-07T07:42:10 UTC, about 15.506 hours after trigger in VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously. No credible sources are detected in stacked images within error box of SVOM/Eclairs (Alaux et al., GCN 45089) and EP-FXT (Liang et al., GCN 45097) down to 10-sigma upper limits of 22.0 mag in both channels at the midtime of 17.43 hr post trigger. The magnitudes are in the AB system and are not corrected for Galactic extinction. Our non-detection is consistent with observations from LCO (Saccardi et al., GCN 45098) and REM (Brivio et al., GCN 45100). 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/45113. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...