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Title: The First Detection of an Orphan Burst at the Rise Phase.
Authors: Lipunov, V. M.; Kornilov, V. G.; Topolev, V. V.; Tyurina, N. V.; Gorbovskoy, E. S.; Simakov, S. G.; Zhirkov, K. K.; Vlasenko, D. S.; Francile, C.; Podesta, R.; Podesta, F.; Svinkin, D. S.; Budnev, N. M.; Balanutsa, P. V.; Cheryasov, D. V.; Chasovnikov, A. R.; Rebolo, R.; Serra-Ricart, M.; Gress, O. A.; Ershova, O. A.
Abstract: 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 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.
Subjects: ORPHANS; GAMMA ray bursts; X-rays
Publication: Astronomy Letters, 2022, Vol 48, Issue 11, p623
ISSN: 1063-7737
Publication type: Academic Journal
DOI: 10.1134/S1063773722110093

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The First Detection of an Orphan Burst at the Rise Phase.