Comprehensive Measurement of Spectral Evolution in a GRB Flare: High Time-Resolution Insights into the "Double-Tracking" Phenomenon
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| author | Yu, Zheng-Hang Tan, Wen-Jun Wang, Chen-Wei Xiong, Shao-Lin Zheng, Chao Zhang, Peng Guo, Hao-Xuan An, Zheng-Hua Cai, Ce Gao, Min Gong, Ke Guo, Dong-Ya Huang, Yue Li, Bing Li, Cheng-Kui Li, Xiao-Bo Li, Xin-Qiao Liu, Jia-Cong Liu, Ya-Qing Liu, Xiao-Jing Ma, Xiang Peng, Wen-Xi Qiao, Rui Ren, Yang-Zhao Song, Li-Ming Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Yue Wen, Xiang-Yang Xiao, Shuo Xie, Sheng-Lun Xue, Wang-Chen Yang, Sheng Yi, Shu-Xu Zhang, Da-Li Zhang, Fan Zhang, Zhen Zhao, Xiao-Yun Zhang, Jin-Peng Zhang, Wen-Long Zhang, Yan-Qiu Zhang, Shuang-Nan Zheng, Shi-Jie |
| author_facet | Yu, Zheng-Hang Tan, Wen-Jun Wang, Chen-Wei Xiong, Shao-Lin Zheng, Chao Zhang, Peng Guo, Hao-Xuan An, Zheng-Hua Cai, Ce Gao, Min Gong, Ke Guo, Dong-Ya Huang, Yue Li, Bing Li, Cheng-Kui Li, Xiao-Bo Li, Xin-Qiao Liu, Jia-Cong Liu, Ya-Qing Liu, Xiao-Jing Ma, Xiang Peng, Wen-Xi Qiao, Rui Ren, Yang-Zhao Song, Li-Ming Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Yue Wen, Xiang-Yang Xiao, Shuo Xie, Sheng-Lun Xue, Wang-Chen Yang, Sheng Yi, Shu-Xu Zhang, Da-Li Zhang, Fan Zhang, Zhen Zhao, Xiao-Yun Zhang, Jin-Peng Zhang, Wen-Long Zhang, Yan-Qiu Zhang, Shuang-Nan Zheng, Shi-Jie |
| contents | The spectral evolution characteristics of the prompt emission in gamma-ray bursts (GRBs) have been extensively studied, but detailed investigations of spectral evolution in a GRB flare remain lacking. In this work, we present the first analysis of spectral parameter evolution in a GRB flare through high time-resolved spectral fitting of the Brightest Flare in GRB 221009A. We find that the $α$-Flux, $E_p$-Flux, and $E_p$-$α$ relationships during both the overall phase and the rise phase of flare can be well described by simple power-law model, showing positive correlations. Therefore, we conclude that Brightest Flare exhibits "Double-tracking" behavior. Since values of $α$ do not exceed the synchrotron "death line" (-2/3), we explain this phenomenon using a magnetic dissipation synchrotron radiation model. In the decay phase of flare, the $E_p$-Flux and $E_p$-$α$ correlations become notably flatter, with their power-law indices decreasing significantly compared to those in the rise phase. This may be due to the fact that the next flare begins to erupt before the Brightest Flare has completely ended, resulting in the combined effects of both two flares. Our study of spectral parameter relations of the Brightest Flare provides new insights into the radiation mechanisms of both GRB prompt emission and flares. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_28570 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Comprehensive Measurement of Spectral Evolution in a GRB Flare: High Time-Resolution Insights into the "Double-Tracking" Phenomenon Yu, Zheng-Hang Tan, Wen-Jun Wang, Chen-Wei Xiong, Shao-Lin Zheng, Chao Zhang, Peng Guo, Hao-Xuan An, Zheng-Hua Cai, Ce Gao, Min Gong, Ke Guo, Dong-Ya Huang, Yue Li, Bing Li, Cheng-Kui Li, Xiao-Bo Li, Xin-Qiao Liu, Jia-Cong Liu, Ya-Qing Liu, Xiao-Jing Ma, Xiang Peng, Wen-Xi Qiao, Rui Ren, Yang-Zhao Song, Li-Ming Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Yue Wen, Xiang-Yang Xiao, Shuo Xie, Sheng-Lun Xue, Wang-Chen Yang, Sheng Yi, Shu-Xu Zhang, Da-Li Zhang, Fan Zhang, Zhen Zhao, Xiao-Yun Zhang, Jin-Peng Zhang, Wen-Long Zhang, Yan-Qiu Zhang, Shuang-Nan Zheng, Shi-Jie High Energy Astrophysical Phenomena The spectral evolution characteristics of the prompt emission in gamma-ray bursts (GRBs) have been extensively studied, but detailed investigations of spectral evolution in a GRB flare remain lacking. In this work, we present the first analysis of spectral parameter evolution in a GRB flare through high time-resolved spectral fitting of the Brightest Flare in GRB 221009A. We find that the $α$-Flux, $E_p$-Flux, and $E_p$-$α$ relationships during both the overall phase and the rise phase of flare can be well described by simple power-law model, showing positive correlations. Therefore, we conclude that Brightest Flare exhibits "Double-tracking" behavior. Since values of $α$ do not exceed the synchrotron "death line" (-2/3), we explain this phenomenon using a magnetic dissipation synchrotron radiation model. In the decay phase of flare, the $E_p$-Flux and $E_p$-$α$ correlations become notably flatter, with their power-law indices decreasing significantly compared to those in the rise phase. This may be due to the fact that the next flare begins to erupt before the Brightest Flare has completely ended, resulting in the combined effects of both two flares. Our study of spectral parameter relations of the Brightest Flare provides new insights into the radiation mechanisms of both GRB prompt emission and flares. |
| title | Comprehensive Measurement of Spectral Evolution in a GRB Flare: High Time-Resolution Insights into the "Double-Tracking" Phenomenon |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2603.28570 |