A 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.
@article{arxiv.2302.00176,
title = {Reanalysis of the X-ray burst associated FRB 200428 with Insight-HXMT observations},
author = {M. Y. Ge and C. Z. Liu and S. N. Zhang and F. J. Lu and Z. Zhang and Z. Chang and Y. L. Tuo and X. B. Li and C. K. Li and S. L. Xiong and C. Cai and X. F. Li and R. Zhang and Z. G. Dai and J. L. Qu and L. M. Song and S. Zhang and L. J. Wang},
journal= {arXiv preprint arXiv:2302.00176},
year = {2023}
}