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

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