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24 June 2024
  » arxiv » 2302.00176

 Article overview

Reanalysis of the X-ray burst associated FRB 200428 with Insight-HXMT observations
M. Y. Ge ; C. Z. Liu ; S. N. Zhang ; F. J. Lu ; Z. Zhang ; Z. Chang ; Y. L. Tuo ; X. B. Li ; C. K. Li ; S. L. Xiong ; C. Cai ; X. F. Li ; R. Zhang ; Z. G. Dai ; J. L. Qu ; L. M. Song ; S. Zhang ; L. J. Wang ;
Date 1 Feb 2023
AbstractA double-peak X-ray burst from the Galactic magnetar SGR J1935+2154 was discovered as associated with the two radio pulses of FRB 200428 separated by 28.97+-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 (FRBs). 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) onboard 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+-0.45 ms and 34.30+-0.56 ms after the first peak of FRB 200428, respectively, while these two parameters are 2.57+-0.52 ms and 32.5+-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 ~60 keV and photon index ~1.4, the latter is softer than that of the underlying bright and broader X-ray burst when the two X-ray peaks appeared.
Source arXiv, 2302.00176
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