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Lipunov, V; Kornilov, V; Zhirkov, K; Tyurina, N; Gorbovskoy, E; Vlasenko, D; Simakov, S; Topolev, V; Francile, C; Podesta, R; Podesta, F; Svinkin, D; Budnev, N; Gress, O; Balanutsa, P; Kuznetsov, A; Chasovnikov, A; Serra-Ricart, M; Gabovich, A; Minkina, E; Antipov, G; Svertilov, S; Tlatov, A; Senik, V; Tselik, Yu; Kechin, Ya; Yurkov, V
Monthly notices of the Royal Astronomical Society, 09/2022, Letnik: 516, Številka: 4Journal Article
ABSTRACT We report on MASTER optical observations of an afterglow-like optical and X-ray transient AT2021lfa/ZTF21aayokph. We detected the initial steady brightening of the transient at 7σ confidence level. This allowed us to use smooth optical self-similar emission of GRBs model to constrain the explosion time to better than 14 min as well as to estimate its initial Lorentz factor Γ0 = 20 ± 10. Taking into consideration the low Γ0 and non-detection in gamma-rays, we classify this transient as the first failed GRB afterglow.
