The First Detection of an Orphan Burst at the Rise Phase

V. M. Lipunov,V. G. Kornilov, V. V. Topolev,N. V. Tyurina,E. S. Gorbovskoy,S. G. Simakov, K. K. Zhirkov, D. S. Vlasenko,C. Francile,R. Podesta,F. Podesta,D. S. Svinkin,N. M. Budnev,P. V. Balanutsa,D. V. Cheryasov, A. R. Chasovnikov,R. Rebolo,M. Serra-Ricart,O. A. Gress,O. A. Ershova,V. V. Yurkov, A. S. Gabovich,A. G. Tlatov, E. M. Minkina,V. V. Vladimirov, A. S. Kuznetsov,G. A. Antipov,S. I. Svertilov,Yu. Tselik,Ya. Kechin

Astronomy Letters（2023）

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摘要

We report on the earliest detection of the optical transient MASTER OT J123248.62-012924.5 coincident within the error box with the optical and X-ray transient AT2021lfa/ZTF21aayokph. In our images the brightness of the object rises monotonically with 7σ confidence. We interpret this transient as a gamma-ray burst (GRB) characterized by smooth optical self-similar (SOSS) emission, while the nondetection of gamma-ray emission at space observatories is interpreted in terms of the hypothesis of a ‘‘failed’’ GRB. Thus, this is the first detection of a nonmonotonic orphan burst.

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关键词

gamma-ray bursts (GRBs),orphan GRBs

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