Two-component jet model for the afterglow emission of GRB 201216C and GRB 221009A and implications for jet structure of very-high-energy gamma-ray bursts - INSPIRE

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Two-component jet model for the afterglow emission of GRB 201216C and GRB 221009A and implications for jet structure of very-high-energy gamma-ray bursts

Yuri Sato
(
- Aoyama Gakuin U.
)
,
Kohta Murase
(
)
,
Yutaka Ohira
(
- Tokyo U.
)
,
Susumu Inoue
(
- Chiba U.
)
,
Ryo Yamazaki
(
- Aoyama Gakuin U. and
- Osaka U. (main)
)

Feb 26, 2025

11 pages

e-Print:

2502.19051 [astro-ph.HE]

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Abstract: (arXiv)

In recent years, afterglow emission in the very-high-energy (VHE) band above 100 GeV have been clearly detected for at least five gamma-ray bursts (GRBs 180720B, 190114C, 190829A, 201216C and 221009A). For some of these VHE GRBs, we previously proposed a two-component jet model, consisting of two uniform jets with narrow and wide opening angles to explain their multiwavelength afterglows including VHE gamma rays. In this paper, we show that the VHE emission from GRBs 201216C and 221009A can be also explained by our two-component jet model. We find that the collimation-corrected kinetic energy of the five VHE GRBs have typical values of 5×10^{49} erg and 5×10^{50} erg for the narrow and wide jets, respectively. We discuss the similarities and differences among the VHE GRBs, and the implications for the structure of their jets. In particular, the narrow jet of GRB 221009A has a smaller opening angle, which can explain why its isotropic-equivalent energy is unusually large.

Note:

11 pages, 3 figures, 1 table

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Figures(6)

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