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| Format: | Preprint |
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2024
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| Online-Zugang: | https://arxiv.org/abs/2407.10156 |
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| author | Yin, Yi-Han Iris Zhang, Bin-Bin Yang, Jun Sun, Hui Zhang, Chen Shao, Yi-Xuan Hu, You-Dong Zhu, Zi-Pei Xu, Dong An, Li Gao, He Wu, Xue-Feng Zhang, Bing Castro-Tirado, Alberto Javier Pandey, Shashi B. Rau, Arne Lei, Weihua Xie, Wei Ghirlanda, Giancarlo Piro, Luigi O'Brien, Paul Troja, Eleonora Jonker, Peter Yu, Yun-Wei An, Jie Chen, Run-Chao Chen, Yi-Jing Dong, Xiao-Fei Eyles-Ferris, Rob Fan, Zhou Fu, Shao-Yu Fynbo, Johan P. U. Gao, Xing Huang, Yong-Feng Jiang, Shuai-Qing Jiang, Ya-Hui Julakanti, Yashaswi Kuulkers, Erik Lao, Qing-Hui Li, Dongyue Ling, Zhi-Xing Liu, Xing Liu, Yuan Mou, Jia-Yu Pan, Xin Varun Wei, Daming Wu, Qinyu Yadav, Muskan Yang, Yu-Han Yuan, Weimin Zhang, Shuang-Nan |
| author_facet | Yin, Yi-Han Iris Zhang, Bin-Bin Yang, Jun Sun, Hui Zhang, Chen Shao, Yi-Xuan Hu, You-Dong Zhu, Zi-Pei Xu, Dong An, Li Gao, He Wu, Xue-Feng Zhang, Bing Castro-Tirado, Alberto Javier Pandey, Shashi B. Rau, Arne Lei, Weihua Xie, Wei Ghirlanda, Giancarlo Piro, Luigi O'Brien, Paul Troja, Eleonora Jonker, Peter Yu, Yun-Wei An, Jie Chen, Run-Chao Chen, Yi-Jing Dong, Xiao-Fei Eyles-Ferris, Rob Fan, Zhou Fu, Shao-Yu Fynbo, Johan P. U. Gao, Xing Huang, Yong-Feng Jiang, Shuai-Qing Jiang, Ya-Hui Julakanti, Yashaswi Kuulkers, Erik Lao, Qing-Hui Li, Dongyue Ling, Zhi-Xing Liu, Xing Liu, Yuan Mou, Jia-Yu Pan, Xin Varun Wei, Daming Wu, Qinyu Yadav, Muskan Yang, Yu-Han Yuan, Weimin Zhang, Shuang-Nan |
| contents | The Einstein Probe (EP) achieved its first detection and localization of a bright X-ray flare, EP240219a, on 2024 February 19, during its commissioning phase. Subsequent targeted searches triggered by the EP240219a alert identified a faint, untriggered gamma-ray burst (GRB) in the archived data of Fermi Gamma-ray Burst Monitor (GBM), Swift Burst Alert Telescope (BAT), and Insight-HXMT/HE. The EP Wide-field X-ray Telescope (WXT) light curve reveals a long duration of approximately 160 s with a slow decay, whereas the Fermi/GBM light curve shows a total duration of approximately 70 s. The peak in the Fermi/GBM light curve occurs slightly later with respect to the peak seen in the EP/WXT light curve. Our spectral analysis shows that a single cutoff power-law (PL) model effectively describes the joint EP/WXT--Fermi/GBM spectra in general, indicating coherent broad emission typical of GRBs. The model yielded a photon index of $\sim -1.70 \pm 0.05$ and a peak energy of $\sim 257 \pm 134$ keV. After detection of GRB 240219A, long-term observations identified several candidates in optical and radio wavelengths, none of which was confirmed as the afterglow counterpart during subsequent optical and near-infrared follow-ups. The analysis of GRB 240219A classifies it as an X-ray rich GRB (XRR) with a high peak energy, presenting both challenges and opportunities for studying the physical origins of X-ray flashes, XRRs, and classical GRBs. Furthermore, linking the cutoff PL component to nonthermal synchrotron radiation suggests that the burst is driven by a Poynting flux-dominated outflow. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_10156 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Triggering the Untriggered: The First Einstein Probe-Detected Gamma-Ray Burst 240219A and Its Implications Yin, Yi-Han Iris Zhang, Bin-Bin Yang, Jun Sun, Hui Zhang, Chen Shao, Yi-Xuan Hu, You-Dong Zhu, Zi-Pei Xu, Dong An, Li Gao, He Wu, Xue-Feng Zhang, Bing Castro-Tirado, Alberto Javier Pandey, Shashi B. Rau, Arne Lei, Weihua Xie, Wei Ghirlanda, Giancarlo Piro, Luigi O'Brien, Paul Troja, Eleonora Jonker, Peter Yu, Yun-Wei An, Jie Chen, Run-Chao Chen, Yi-Jing Dong, Xiao-Fei Eyles-Ferris, Rob Fan, Zhou Fu, Shao-Yu Fynbo, Johan P. U. Gao, Xing Huang, Yong-Feng Jiang, Shuai-Qing Jiang, Ya-Hui Julakanti, Yashaswi Kuulkers, Erik Lao, Qing-Hui Li, Dongyue Ling, Zhi-Xing Liu, Xing Liu, Yuan Mou, Jia-Yu Pan, Xin Varun Wei, Daming Wu, Qinyu Yadav, Muskan Yang, Yu-Han Yuan, Weimin Zhang, Shuang-Nan High Energy Astrophysical Phenomena The Einstein Probe (EP) achieved its first detection and localization of a bright X-ray flare, EP240219a, on 2024 February 19, during its commissioning phase. Subsequent targeted searches triggered by the EP240219a alert identified a faint, untriggered gamma-ray burst (GRB) in the archived data of Fermi Gamma-ray Burst Monitor (GBM), Swift Burst Alert Telescope (BAT), and Insight-HXMT/HE. The EP Wide-field X-ray Telescope (WXT) light curve reveals a long duration of approximately 160 s with a slow decay, whereas the Fermi/GBM light curve shows a total duration of approximately 70 s. The peak in the Fermi/GBM light curve occurs slightly later with respect to the peak seen in the EP/WXT light curve. Our spectral analysis shows that a single cutoff power-law (PL) model effectively describes the joint EP/WXT--Fermi/GBM spectra in general, indicating coherent broad emission typical of GRBs. The model yielded a photon index of $\sim -1.70 \pm 0.05$ and a peak energy of $\sim 257 \pm 134$ keV. After detection of GRB 240219A, long-term observations identified several candidates in optical and radio wavelengths, none of which was confirmed as the afterglow counterpart during subsequent optical and near-infrared follow-ups. The analysis of GRB 240219A classifies it as an X-ray rich GRB (XRR) with a high peak energy, presenting both challenges and opportunities for studying the physical origins of X-ray flashes, XRRs, and classical GRBs. Furthermore, linking the cutoff PL component to nonthermal synchrotron radiation suggests that the burst is driven by a Poynting flux-dominated outflow. |
| title | Triggering the Untriggered: The First Einstein Probe-Detected Gamma-Ray Burst 240219A and Its Implications |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2407.10156 |