Time intervals between adjacent eruptions of GSN 069 (G. Miniutti et al. 2019). There are clearly two antiphase branches, denoted as T_even(t) and T_odd(t), where both of them vary with a period ≈76 d, while the sum T_even(t) + T_odd(t) ≈ 65 ks (C. Zhou et al. 2025a, 2025b). No evidence for an in-phase modulation in even and odd eruptions is revealed.