TITLE: GCN CIRCULAR NUMBER: 39514 SUBJECT: EP250226a / GRB 250226A: SVOM/VT optical observations DATE: 25/02/27 11:48:14 GMT FROM: Xuhui Han at NAOC/SVOM <hxh@nao.cas.cn> R. Z. Li (YNAO), Z. Q. Wang (GXU), W. K. Zheng (UCB), X. H. Han, L. P. Xin, Y. L. Qiu, H. L. Li, C. Wu, Z. H. Yao, Y. N. Ma, H. B. Cai, J. Wang, Y. Xu, J. Y. Wei (NAOC), J. T. Palmerio (CEA/Irfu) report on behalf of the SVOM team: The SVOM/VT conducted a ToO follow-up observation of the EP250226a/GRB 250226A (Jiang et al., GCN 39482; Fermi GBM team, GCN 39479; Zhang et al., GCN 39492; INTEGRAL/SPI-ACS (triNum #11070)) in VT_B (400nm-650nm) and VT_R (650nm-1000nm) channel simultaneously with an exposure time of 18*100 seconds. The afterglow (An et. al., GCN 39486; Zhu et. al., GCN 39487; Magnani et al., GCN 39488; Li et. al., GCN 39489; Aryan et al., GCN 39509; Zou et al., GCN 39511; Zhu et al., GCN 39487) was detected with a brightness of 22.58+/-0.14 mag (AB) in VT_B and 21.56+/-0.10 mag (AB) in VT_R, at the mid-time of 20.45 hours post the burst. 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/39514. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...