Orphan optical flare as SOSS emission afterglow, localization in time

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 7{\sigma} confidence level. This allowed us to use smooth optical self-similar emission of GRBs model to constrain the expl...

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Veröffentlicht in:	arXiv.org 2023-02
Hauptverfasser:	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, Yu Tselik, Kechin, Ya, Yurkov, V
Format:	Artikel
Sprache:	eng
Schlagworte:	Afterglows Brightening Confidence intervals Emission Gamma ray bursts Lorentz factor Physics - High Energy Astrophysical Phenomena Self-similarity
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Zusammenfassung:	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 7{\sigma} 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 {\Gamma}0 = 20 +/- 10. Taking into consideration the low {\Gamma}0 and non-detection in gamma-rays, we classify this transient as the first failed GRB afterglow.
ISSN:	2331-8422
DOI:	10.48550/arxiv.2302.05924