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Orphan optical flare as SOSS emission afterglow, localization in time

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arxiv 2302.05924 v1 pith:VLJ7WZYO submitted 2023-02-12 astro-ph.HE

V. Lipunov , V. Kornilov , K. Zhirkov , N. Tyurina , E. Gorbovskoy , D. Vlasenko , S. Simakov , V. Topolev
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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 S. Svertilov A. Tlatov V. Senik Yu. Tselik Ya. Kechin V. Yurkov
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keywords opticaltransientafterglowemissiongammainitialtimeafterglow-like
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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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  1. Polarization of impulsive relativistic jets propagating in a stratified medium

    astro-ph.HE 2026-07 conditional novelty 5.0 of 10

    Stratified external media reduce and slow the temporal evolution of afterglow polarization in impulsive jets, with the polarization peak near the geometrical light-curve break.

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