The First Detection of an Orphan Burst at the Rise Phase
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 $7σ$ 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.
- Publication:
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Astronomy Letters
- Pub Date:
- November 2022
- DOI:
- Bibcode:
- 2022AstL...48..623L
- Keywords:
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- gamma-ray bursts (GRBs);
- orphan GRBs