GRB 220408B: A Three-Episode Burst from a Precessing Jet

IF 1.8 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Research in Astronomy and Astrophysics Pub Date : 2023-10-17 DOI:10.1088/1674-4527/acfa59

Zijian Zhang, Yi-Han Iris Yin, Chenyu Wang, Xiangyu Ivy Wang, Jun Yang, Yan-Zhi Meng, Zi-Ke Liu, Guo-Yin Chen, Xiaoping Fu, Huaizhong Gao, Sihao Li, Yihui Liu, Xiangyun Long, Yong-Chang Ma, Xiaofan Pan, Yuanze Sun, Wei Wu, Zirui Yang, Zhizhen Ye, Xiaoyu Yu, Shuheng Zhao, Xutao Zheng, Tao Zhou, Qing-Wen Tang, Qiurong Qiu, Rong Zhou, Zhonghai Wang, Hua Feng, Ming Zeng, Binbin Zhang

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Abstract

Abstract Jet precession has previously been proposed to explain the apparently repeating features in the light curves of a few gamma-ray bursts (GRBs). In this paper, we further apply the precession model to a bright GRB 220408B by examining both its temporal and spectral consistency with the predictions of the model. As one of the recently confirmed GRBs observed by our GRID CubeSat mission, GRB 220408B is noteworthy as it exhibits three apparently similar emission episodes. Furthermore, the similarities are reinforced by their strong temporal correlations and similar features in terms of spectral evolution and spectral lags. Our analysis demonstrates that these features can be well explained by the modulated emission of a Fast-Rise-Exponential-Decay (FRED) shape light curve intrinsically produced by a precessing jet with a precession period of 18.4 − 0.2 + 0.2 s, a nutation period of 11.1 − 0.2 + 0.2 s and viewed off-axis. This study provides a straightforward explanation for the complex yet similar multi-episode GRB light curves.

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GRB 220408B:一个三集的喷气机爆发

射流进动先前被提出用来解释一些伽马射线暴(GRBs)的光曲线中明显重复的特征。在本文中，我们进一步将进动模型应用于明亮的GRB 220408B，通过检验其时间和光谱与模型预测的一致性。GRB 220408B是我们的GRID立方体卫星任务最近观测到的确认的GRB之一，值得注意的是，它表现出三次明显相似的发射事件。此外，它们在光谱演化和光谱滞后方面的强时间相关性和相似特征增强了相似性。我们的分析表明，这些特征可以很好地解释为快速上升-指数衰减(FRED)形状光曲线的调制发射，该光曲线本质上是由进动周期为18.4−0.2 + 0.2 s的进动射流产生的，章动周期为11.1−0.2 + 0.2 s，并且离轴观察。这项研究为复杂而相似的GRB光曲线提供了一个直接的解释。

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来源期刊

Research in Astronomy and Astrophysics 地学天文-天文与天体物理

CiteScore

3.20

自引率

16.70%

发文量

2599

审稿时长

6.0 months

期刊介绍： Research in Astronomy and Astrophysics (RAA) is an international journal publishing original research papers and reviews across all branches of astronomy and astrophysics, with a particular interest in the following topics: -large-scale structure of universe formation and evolution of galaxies- high-energy and cataclysmic processes in astrophysics- formation and evolution of stars- astrogeodynamics- solar magnetic activity and heliogeospace environments- dynamics of celestial bodies in the solar system and artificial bodies- space observation and exploration- new astronomical techniques and methods