Orphan optical flare as SOSS emission afterglow, localization in time
V. Lipunov, V. Kornilov, K. Zhirkov, N. Tyurina, E. Gorbovskoy, D., Vlasenko, S. Simakov, V. Topolev, C. Francile, R. Podesta, F. Podesta, D., Svinkin, N. Budnev, O. Gress, P. Balanutsa, A. Kuznetsov, A. Chasovnikov, M., Serra-Ricart, A. Gabovich, E. Minkina, G. Antipov
TL;DR
This paper reports the detection and analysis of a failed gamma-ray burst afterglow, using optical and X-ray observations to constrain its explosion time and initial Lorentz factor, suggesting a new class of transient.
Contribution
It introduces the first identification of a failed GRB afterglow based on optical and X-ray data, with constraints on explosion timing and Lorentz factor.
Findings
Explosion time constrained to within 14 minutes.
Initial Lorentz factor estimated at 20 +/- 10.
Classified as the first failed GRB afterglow.
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 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.
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