TITLE: GCN CIRCULAR NUMBER: 45359 SUBJECT: GRB 260808B: SVOM/VT optical re-brightening at day 3 DATE: 26/08/12 09:56:46 GMT FROM: Huali Li at at NAOC, SVOM <lhl@nao.cas.cn> H. L. Li, C. Wu, L. P. Xin, Y. L. Qiu, Y. N. Ma, Z. H. Yao, J. R. Xu, X. H. Han, J. Wang, Y. Xu, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, J. S. Deng, J. Y. Wei (NAOC), J. T. Palmerio (CEA/Irfu) report on behalf of the SVOM/VT team. SVOM/VT performed further ToO observations of GRB 260808B (sb26080812; Bouchet et al., GCN 45316; Brunet et al., GCN 45333) on 10 and 11 August 2026. The two epochs correspond to mid-times of 1.45 d and 2.94 d post-trigger, with simultaneous exposures acquired in the VT_B (400–650 nm) and VT_R (650–1000 nm) channels. The afterglow (Turpin et al., GCN 45318; Li et al., GCN 45320; Wang et al., GCN 45322; Adami et al., GCN 45323; Saccardi et al., GCN 45328; Schneider et al., GCN 45329; Bochenek et al., GCN 45330; Mohan et al., GCN 45334; Basa et al., GCN 45341; Burkhonov et al., GCN 45352) was still detected at these two epochs and exhibited rebrightening in both channels on 11 August 2026. The following measurements are in the AB magnitude and are not corrected for Galactic extinction: Mid time | Band | Exposure Time | Brightness 2.94 d VT_B 78*80 s 21.9 +/- 0.2 mag 2.94 d VT_R 80*70 s 21.3 +/- 0.2 mag More observations for this burst are encouraged. 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/45359. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...