Orphan optical flare as SOSS emission afterglow, localization in time
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 7σ 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 Γ0 = 20 ± 10. Taking into consideration the low Γ0 and non-detection in gamma-rays, we classify this transient as the first failed GRB afterglow.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- November 2022
- DOI:
- arXiv:
- arXiv:2302.05924
- Bibcode:
- 2022MNRAS.516.4980L
- Keywords:
-
- stars: black holes;
- (stars:) gamma-ray burst: general;
- stars: neutron;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 8 pages, 5 figures, accepted for publication in MNRAS
