Triggering the Untriggered: The First Einstein Probe-detected Gamma-Ray Burst 240219A and Its Implications

doi:10.3847/2041-8213/ad8652

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	Triggering the Untriggered: The First Einstein Probe-detected Gamma-Ray Burst 240219A and Its Implications
	Yin, Yi-Han Iris 1,2; Zhang, Bin-Bin 1,2,3; Yang, Jun1,2 ; Sun, Hui 4; Zhang, Chen 4; Shao, Yi-Xuan 1,2; Hu, You-Dong 5; Zhu, Zi-Pei 4; Xu, Dong 4; An, Li 6,7; Gao, He 6,7; Wu, Xue-Feng 3; Zhang, Bing 8,9; Castro-Tirado, Alberto Javier 5,10; Pandey, Shashi B.11; Rau, Arne 12; Lei, Weihua 13; Xie, Wei 14; Ghirlanda, Giancarlo 15,16; Piro, Luigi 17; O'Brien, Paul 18; Troja, Eleonora 19,20; Jonker, Peter 21; Yu, Yun-Wei 22; An, Jie 4; Chen, Run-Chao 1,2; Chen, Yi-Jing 1; Dong, Xiao-Fei 1,2; Eyles-Ferris, Rob 18; Fan, Zhou 4; Fu, Shao-Yu 4; Fynbo, Johan P. U.23,24; Gao, Xing 25; Huang, Yong-Feng 1,2; Jiang, Shuai-Qing 4; Jiang, Ya-Hui 1; Julakanti, Yashaswi 18; Kuulkers, Erik 26; Lao, Qing-Hui 1; Li, Dongyue 4; Ling, Zhi-Xing 4; Liu, Xing 4; Liu, Yuan 4; Mou, Jia-Yu 1; Pan, Xin 4; Wei, Daming 3; Wu, Qinyu 4; Yadav, Muskan 19; Yang, Yu-Han 19; Yuan, Weimin 4; Zhang, Shuang-Nan 27
	2024-11-01
Source Publication	ASTROPHYSICAL JOURNAL LETTERS
ISSN	2041-8205
Volume	975 Issue:2 Pages:L27
Contribution Rank	25
Abstract	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 similar to-1.70 +/- 0.05 and a peak energy of similar to 257 +/- 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.
DOI	10.3847/2041-8213/ad8652
Indexed By	SCI
Language	英语
WOS Keyword	FLASHES ; MAGNETIZATION ; LUMINOSITY ; COMPONENTS ; EFFICIENT ; BEPPOSAX ; LAGS
Funding Project	National Key Research and Development Programs of China[2022YFF0711404] ; National Key Research and Development Programs of China[2022SKA0130102] ; National Key Research and Development Programs of China[2021YFA0718500] ; National SKA Program of China[2022SKA0130100] ; National Natural Science Foundation of China[11833003] ; National Natural Science Foundation of China[U2038105] ; National Natural Science Foundation of China[U1831135] ; National Natural Science Foundation of China[12121003] ; National Natural Science Foundation of China[12393811] ; National Natural Science Foundation of China[13001106] ; China Manned Space Project[CMS-CSST-2021-B11] ; Fundamental Research Funds for the Central Universities[D050102] ; Fundamental Research Funds for the Central Universities[HA 1850/28-1]
WOS Research Area	Astronomy & Astrophysics
WOS Subject	Astronomy & Astrophysics
WOS ID	WOS:001347485800001
Publisher	IOP Publishing Ltd
Funding Organization	National Key Research and Development Programs of China ; National SKA Program of China ; National Natural Science Foundation of China ; China Manned Space Project ; Fundamental Research Funds for the Central Universities
Citation statistics	Cited Times:10[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.xao.ac.cn/handle/45760611-7/7121
Collection	中国科学院新疆天文台
Corresponding Author	Zhang, Bin-Bin; Zhang, Chen
Affiliation	1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China 2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210023, Peoples R China 3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210023, Peoples R China 4.Chinese Acad Sci, R P China, Beijing 550001, Peoples R China 5.Inst Astrofis Andalucia IAA CSIC, Glorieta Astron S-N, E-18008 Granada, Spain 6.Beijing Normal Univ, Beijing, Peoples R China 7.Beijing Normal Univ, Inst Frontier Astron & Astrophys, Beijing, Peoples R China 8.Univ Nevada Vegas, Las Vegas, NV USA 9.Univ Nevada Las Vegas, Dept Phys & Astron, Las Vegas, NV USA 10.Univ Malaga, Dept Ingn Sistemas & Automati, C Dr Ortiz Ramos Sn, Malaga, Spain 11.Aryabhatta Res Inst Observat Sci ARIES, Naini Tal, India 12.Max Planck Inst Extraterr Phys, Gieenbachstr, Garching, Germany 13.Huazhong Univ Sci & Technol, Sch Phys, Dept Astron, Wuhan 430074, Hubei, Peoples R China 14.Guizhou Normal Univ, Sch Phys & Elect Sci, Dept Astron, Guiyang 550001, Peoples R China 15.INAF Osservatorio Astron Brera, Via E Bianchi 46, Merate, LC, Italy 16.INFN, Sez Milano Bicocca, Piazza Sci 3, Milan, MI, Italy 17.INAF Ist Astrofis & Planetol Spaziali, Via Fosso del Cavaliere 100, Rome, Italy 18.Univ Leicester, Sch Phys & Astron, Univ Rd, Leicester LE1 7RH, England 19.Univ RomeTor Vergata, Dept Phys, Via Ric Sci 1, I-00133 Rome, Italy 20.INAF, Via Parco del Mellini, Rome, Italy 21.Radboud Univ Nijmegen, Dept Astrophys, IMAPP, NL-6500 GL Nijmegen, Netherlands 22.Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China 23.Cosm Dawn Ctr DAWN, DK-2200 Copenhagen, Denmark 24.Univ Copenhagen, Niels Bohr Inst, DK-2200 Copenhagen, Denmark 25.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China 26.ESTEC, European Space Agcy, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands 27.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
Recommended Citation GB/T 7714	Yin, Yi-Han Iris,Zhang, Bin-Bin,Yang, Jun,et al. Triggering the Untriggered: The First Einstein Probe-detected Gamma-Ray Burst 240219A and Its Implications[J]. ASTROPHYSICAL JOURNAL LETTERS,2024,975(2):L27.
APA	Yin, Yi-Han Iris.,Zhang, Bin-Bin.,Yang, Jun.,Sun, Hui.,Zhang, Chen.,...&Zhang, Shuang-Nan.(2024).Triggering the Untriggered: The First Einstein Probe-detected Gamma-Ray Burst 240219A and Its Implications.ASTROPHYSICAL JOURNAL LETTERS,975(2),L27.
MLA	Yin, Yi-Han Iris,et al."Triggering the Untriggered: The First Einstein Probe-detected Gamma-Ray Burst 240219A and Its Implications".ASTROPHYSICAL JOURNAL LETTERS 975.2(2024):L27.

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