TITLE: GCN CIRCULAR NUMBER: 43300 SUBJECT: GRB 260102A: SVOM/VT optical counterpart DATE: 26/01/02 12:45:56 GMT FROM: Huali Li at at NAOC, SVOM <lhl@nao.cas.cn> C. Wu, H. L. Li, L. P. Xin, Y. L. Qiu, Y. N. Ma, Z. H. Yao, X. H. Han, J. Wang, Y. Xu, P. P. Zhang, W. J. Xie, Y. J. Xiao, L. Lan, J. R. Xu, H. B. Cai, J. S. Deng, J. Y. Wei (NAOC), J. Palmerio (CEA), W. J. Tan (IHEP) report on behalf of the SVOM team. SVOM performed an automatic slew on the burst GRB 260102A triggered by SVOM/ECLAIRs (sb26010201, Xie et al., GCN 42295) in VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously. The observation began at 2026-01-02T04:13:40, i.e., 217 sec post trigger. An optical uncatalogued source was detected within errorbox of ECLAIRs (Xie et al., GCN 42295) and Swift-XRT source #2 (Evans et al., GCN 43298), compared to the Legacy survey catalog. The position is at R.A., Dec. = 183.95015, 48.25116 degrees, equivalent to: R.A. (J2000) = 12:15:48.03 Dec. (J2000) = 48:15:04.18 with an uncertainty of 0.5 arcsec. The magnitudes are: Mid_time Band Exposure Time Magnitude (AB) 242 sec VT_B 50 sec 19.98+/-0.06 242 sec VT_R 50 sec 18.46+/-0.03 872 sec VT_B 50 sec 21.40+/-0.16 872 sec VT_R 50 sec 20.21+/-0.10 Our photometry was not corrected for Galactic extinction. More follow-ups 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/43300. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...