A Precessing, Magnetically Dominated, Structured Jet Powering the Hour-scale Quasiperiodic GRB 250702B
Fuente:
arXiv
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| Autore principale: | |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908739742728192 |
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| author | An, Tao |
| author_facet | An, Tao |
| contents | GRB 250702B shows ultra-long, episodic prompt activity (three hard gamma-ray episodes over ~ 3.2 h with quasi-regular spacing P~ 2825 s preceded by a soft X-ray flare about one day earlier. We interpret these phenomena with a unified scenario in which a stellar-mass black hole accretes from a massive, misaligned debris disk and launches a magnetically dominated, precessing, structured (spine-sheath) jet. The engine "clock" arises from Lense-Thirring precession of the outer annulus of a geometrically thick inner torus at r ~ 250-300 rg, while the hard spectra reflect magnetic-reconnection dissipation in the spine. A slightly off-axis viewing geometry resolves the apparent opening-angle tension without invoking late energy injection. "Missing" pulses in the second/third cycles occur naturally when low-amplitude nutation causes the beaming cone to miss the line of sight. The model yields concrete, falsifiable predictions, providing a self-consistent explanation of GRB 250702B's radiative and outflow anomalies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_09850 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Precessing, Magnetically Dominated, Structured Jet Powering the Hour-scale Quasiperiodic GRB 250702B An, Tao High Energy Astrophysical Phenomena GRB 250702B shows ultra-long, episodic prompt activity (three hard gamma-ray episodes over ~ 3.2 h with quasi-regular spacing P~ 2825 s preceded by a soft X-ray flare about one day earlier. We interpret these phenomena with a unified scenario in which a stellar-mass black hole accretes from a massive, misaligned debris disk and launches a magnetically dominated, precessing, structured (spine-sheath) jet. The engine "clock" arises from Lense-Thirring precession of the outer annulus of a geometrically thick inner torus at r ~ 250-300 rg, while the hard spectra reflect magnetic-reconnection dissipation in the spine. A slightly off-axis viewing geometry resolves the apparent opening-angle tension without invoking late energy injection. "Missing" pulses in the second/third cycles occur naturally when low-amplitude nutation causes the beaming cone to miss the line of sight. The model yields concrete, falsifiable predictions, providing a self-consistent explanation of GRB 250702B's radiative and outflow anomalies. |
| title | A Precessing, Magnetically Dominated, Structured Jet Powering the Hour-scale Quasiperiodic GRB 250702B |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2511.09850 |