Prompt-to-afterglow transition of optical emission in a long gamma-ray burst consistent with a fireball
| Autor: | Liping Xin, Xuhui Han, Huali Li, Bing Zhang, Jing Wang, Damien Turpin, Xing Yang, Yulei Qiu, Enwei Liang, Zigao Dai, Hongbo Cai, Xiaomeng Lu, Xiang-Yu Wang, Lei Huang, Xianggao Wang, Chao Wu, He Gao, Jia Ren, Lulu Zhang, Yuangui Yang, Jingsong Deng, Jianyan Wei |
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| Přispěvatelé: | Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Astrophysics - Solar and Stellar Astrophysics FOS: Physical sciences Astronomy and Astrophysics [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Instrumentation and Methods for Astrophysics Instrumentation and Methods for Astrophysics (astro-ph.IM) Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Nature Astron. Nature Astron., 2023, 7 (6), pp.724-730. ⟨10.1038/s41550-023-01930-0⟩ |
| DOI: | 10.1038/s41550-023-01930-0⟩ |
| Popis: | Long gamma-ray bursts (GRBs), which signify the end-life collapsing of very massive stars, are produced by extremely relativistic jets colliding into circumstellar medium. Huge energy is released both in the first few seconds, namely the internal dissipation phase that powers prompt emissions, and in the subsequent self-similar jet-deceleration phase that produces afterglows observed in broad-band electromagnetic spectrum. However, prompt optical emissions of GRBs have been rarely detected, seriously limiting our understanding of the transition between the two phases. Here we report detection of prompt optical emissions from a gamma-ray burst (i.e. GRB 201223A) using a dedicated telescope array with a high temporal resolution and a wide time coverage. The early phase coincident with prompt {\gamma}-ray emissions show a luminosity in great excess with respect to the extrapolation of {\gamma}-rays, while the later luminosity bump is consistent with onset of the afterglow. The clearly detected transition allows us to differentiate physical processes contributing to early optical emissions and to diagnose the composition of the jet Comment: Authors' version of article published in Nature Astronomy, see their website for official version |
| Databáze: | OpenAIRE |
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