Reanalysis of the X-Ray-burst-associated FRB 200428 with Insight-HXMT Observations

被引：9

作者：

Ge, M. Y. ^{[1
]}

Liu, C. Z. ^{[1
]}

Zhang, S. N. ^{[1
,2
]}

Lu, F. J. ^{[1
,3
,4
]}

Zhang, Z. ^{[1
]}

Chang, Z. ^{[1
]}

Tuo, Y. L. ^{[1
]}

Li, X. B. ^{[1
]}

Li, C. K. ^{[1
]}

Xiong, S. L. ^{[1
]}

Cai, C. ^{[1
]}

Li, X. F. ^{[1
]}

Zhang, R. ^{[5
]}

Dai, Z. G. ^{[6
]}

Qu, J. L. ^{[1
]}

Song, L. M. ^{[1
]}

Zhang, S. ^{[1
]}

Wang, L. J. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China

[2] Chinese Acad Sci, Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Xiangtan Univ, Key Lab Stellar & Interstellar Phys, Xiangtan 411105, Peoples R China

[4] Xiangtan Univ, Sch Phys & Optoelect, Xiangtan 411105, Peoples R China

[5] Chinese Acad Sci, Inst High Energy Phys, Theoret Phys Div, Beijing 100049, Peoples R China

[6] Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2023年 / 953卷 / 01期

基金：

中国国家自然科学基金;

关键词：

FAST RADIO-BURSTS; EMISSION; MAGNETARS; ONBOARD; IMPACT; MODEL;

D O I：

10.3847/1538-4357/acda1d

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A double-peak X-ray burst from the Galactic magnetar SGR J1935+2154 was discovered to be associated with the two radio pulses of FRB 200428 separated by 28.97 & PLUSMN; 0.02 ms. Precise measurements of the timing and spectral properties of the X-ray bursts are helpful for understanding the physical origin of fast radio bursts. In this paper, we have reconstructed some information about the hard X-ray events, which were lost because the High Energy X-ray Telescope (HE) on board the Insight-HXMT mission was saturated by this extremely bright burst, and used the information to improve the temporal and spectral analyses of the X-ray burst. The arrival times of the two X-ray peaks by fitting the new Insight-HXMT/HE lightcurve with multi-Gaussian profiles are 2.77 & PLUSMN; 0.45 ms and 34.30 & PLUSMN; 0.56 ms after the first peak of FRB 200428, respectively, while these two parameters are 2.57 & PLUSMN; 0.52 ms and 32.5 & PLUSMN; 1.4 ms if the fitting profile is a fast-rise and exponential decay function. The spectrum of the two X-ray peaks could be described by a cutoff power law with cutoff energy & SIM;60 keV and photon index & SIM;1.4; the latter is softer than the result obtained in Li et al. when the two X-ray peaks appeared.

引用

页数：9

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