Jet-Structure Imprint on the Curvature Tail of Gamma-Ray Burst Prompt Emission
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866911691650891776 |
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| author | Yan, Zhen-Yu Zhao, Xiao-Hong van Eerten, Hendrik J. Yang, Jun Tuo, Jiang-Chuan Yi, Shu-Xu Wang, Chen-Wei Tan, Wen-Jun Xiong, Shao-Lin Zhang, Bin-Bin |
| author_facet | Yan, Zhen-Yu Zhao, Xiao-Hong van Eerten, Hendrik J. Yang, Jun Tuo, Jiang-Chuan Yi, Shu-Xu Wang, Chen-Wei Tan, Wen-Jun Xiong, Shao-Lin Zhang, Bin-Bin |
| contents | Even though the prompt emission of gamma-ray bursts (GRBs) is highly beamed, high-latitude emission still produces a distinct light curve break after the intrinsic emission ceases and the edge of the jet comes into view. This curvature effect offers a direct probe of the jet structure during the prompt phase. To uncover the geometric structure of the GRB jet encoded in the prompt light-curve evolution, we develop a numerical model that calculates synchrotron light curves from structured jets to interpret the observed break. We apply this model to the prompt emission of GRB 230307A, which displays a rare late-time break. Our analysis demonstrates that simple spherical outflow and top-hat jet models are inadequate to reproduce the light curve. Instead, the observations are best described by a power-law wing jet with a uniform core ($θ_{\rm core}=0.0147$ rad) and a surrounding power-law wing. Our results demonstrate that the break in late-time prompt emission can be a powerful diagnostic of GRB jet structure. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_17060 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Jet-Structure Imprint on the Curvature Tail of Gamma-Ray Burst Prompt Emission Yan, Zhen-Yu Zhao, Xiao-Hong van Eerten, Hendrik J. Yang, Jun Tuo, Jiang-Chuan Yi, Shu-Xu Wang, Chen-Wei Tan, Wen-Jun Xiong, Shao-Lin Zhang, Bin-Bin High Energy Astrophysical Phenomena Even though the prompt emission of gamma-ray bursts (GRBs) is highly beamed, high-latitude emission still produces a distinct light curve break after the intrinsic emission ceases and the edge of the jet comes into view. This curvature effect offers a direct probe of the jet structure during the prompt phase. To uncover the geometric structure of the GRB jet encoded in the prompt light-curve evolution, we develop a numerical model that calculates synchrotron light curves from structured jets to interpret the observed break. We apply this model to the prompt emission of GRB 230307A, which displays a rare late-time break. Our analysis demonstrates that simple spherical outflow and top-hat jet models are inadequate to reproduce the light curve. Instead, the observations are best described by a power-law wing jet with a uniform core ($θ_{\rm core}=0.0147$ rad) and a surrounding power-law wing. Our results demonstrate that the break in late-time prompt emission can be a powerful diagnostic of GRB jet structure. |
| title | Jet-Structure Imprint on the Curvature Tail of Gamma-Ray Burst Prompt Emission |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2605.17060 |