Time-resolved Spectral Properties of Fermi-GBM Bright Long Gamma-Ray Bursts

doi:10.1088/1674-4527/ad16af

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	Time-resolved Spectral Properties of Fermi-GBM Bright Long Gamma-Ray Bursts
	Wang, Wan-Kai 1,2; Xie, Wei 1,2; Gao, Zhi-Fu3 ; Xiao, Shuo 1,2; Dong, Ai-Jun 1,2; Zhang, Bin 1,2; Zhi, Qi-Jun 1,2
	2024-02-01
Source Publication	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN	1674-4527
Volume	24 Issue:2 Pages:025006
Contribution Rank	3
Abstract	The prompt emission mechanism of gamma-ray bursts (GRBs) is still unclear, and the time-resolved spectral analysis of GRBs is a powerful tool for studying their underlying physical processes. We performed a detailed time-resolved spectral analysis of 78 bright long GRB samples detected by Fermi/Gamma-ray Burst Monitor. A total of 1490 spectra were obtained and their properties were studied using a typical Band-shape model. First, the parameter distributions of the time-resolved spectrum are given as follows: the low-energy spectral index alpha similar to - 0.72, high-energy spectral index beta similar to - 2.42, the peak energy E-p similar to 221.69 keV, and the energy flux F similar to 7.49 x 10(-6) erg cm(-2) s(-1). More than 80% of the bursts exhibit the hardest low-energy spectral index alpha(max) exceeding the synchrotron limit (-2/3). Second, the evolution patterns of alpha and E-p were statistically analyzed. The results show that for multi-pulse GRBs the intensity-tracking pattern is more common than the hard-to-soft pattern in the evolution of both E-p and alpha. The hard-to-soft pattern is generally shown in single-pulse GRBs or in the initial pulse of multi-pulse GRBs. Finally, we found a significant positive correlation between F and E-p, with half of the samples exhibiting a positive correlation between F and alpha. We discussed the spectral evolution of different radiation models. The diversity of spectral evolution patterns indicates that there may be more than one radiation mechanism occurring in the GRB radiation process, including photospheric radiation and synchrotron radiation. However, it may also involve only one radiation mechanism, but more complicated physical details need to be considered.
Keyword	(stars:) gamma-ray burst: general methods: statistical methods: data analysis
DOI	10.1088/1674-4527/ad16af
Indexed By	SCI
Language	英语
WOS Keyword	E-P EVOLUTION ; PROMPT EMISSION ; PHOTOSPHERIC EMISSION ; SYNCHROTRON-RADIATION ; COMPREHENSIVE ANALYSIS ; INTENSITY CORRELATION ; THERMAL EMISSION ; PEAK ENERGY ; GRB ; COMPONENT
Funding Project	Science and Technology Foundation of Guizhou Province[QianKeHeJiChu ZK[2021]027] ; Major Science and Technology Program of Xinjiang Uygur Autonomous Region[2022A03013-1] ; National Key Research and Development Program of China[2022YFC2205202] ; National Natural Science Foundation of China[12288102] ; National Natural Science Foundation of China[12041304] ; National Natural Science Foundation of China[11847102]
WOS Research Area	Astronomy & Astrophysics
WOS Subject	Astronomy & Astrophysics
WOS ID	WOS:001148810200001
Publisher	NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Funding Organization	Science and Technology Foundation of Guizhou Province ; Major Science and Technology Program of Xinjiang Uygur Autonomous Region ; National Key Research and Development Program of China ; National Natural Science Foundation of China
Citation statistics	Cited Times:2[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.xao.ac.cn/handle/45760611-7/5756
Collection	射电天文研究室_脉冲星研究团组
Corresponding Author	Xie, Wei
Affiliation	1.Guizhou Normal Univ, Sch Phys & Elect Sci, Dept Astron, Guiyang 550001, Peoples R China 2.Guizhou Normal Univ, Guizhou Prov Key Lab Radio Astron Data Proc, Guiyang 550001, Peoples R China 3.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
Recommended Citation GB/T 7714	Wang, Wan-Kai,Xie, Wei,Gao, Zhi-Fu,et al. Time-resolved Spectral Properties of Fermi-GBM Bright Long Gamma-Ray Bursts[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2024,24(2):025006.
APA	Wang, Wan-Kai.,Xie, Wei.,Gao, Zhi-Fu.,Xiao, Shuo.,Dong, Ai-Jun.,...&Zhi, Qi-Jun.(2024).Time-resolved Spectral Properties of Fermi-GBM Bright Long Gamma-Ray Bursts.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,24(2),025006.
MLA	Wang, Wan-Kai,et al."Time-resolved Spectral Properties of Fermi-GBM Bright Long Gamma-Ray Bursts".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 24.2(2024):025006.

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