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 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.

11 pages, 7 figures

References in corpus (15)

• A bright millisecond-duration radio burst from a Galactic magnetar
• Fast Radio Bursts
• INTEGRAL discovery of a burst with associated radio emission from the magnetar SGR 1935+2154
• The Physical Mechanisms of Fast Radio Bursts
• Implications of a "Fast Radio Burst" from a Galactic Magnetar
• The Physics of Fast Radio Bursts
• Repeating Fast Radio Bursts from Magnetars with Low Magnetospheric Twist
• The NICER View of the 2020 Burst Storm and Persistent Emission of SGR 1935+2154
• Fast radio bursts and their high-energy counterpart from magnetar magnetospheres
• Plasmoid ejection by Alfvén waves and the fast radio bursts from SGR 1935+2154
• Pair separation in parallel electric field in magnetar magnetosphere and narrow spectra of fast radio bursts
• A Magnetar-Asteroid Impact Model for FRB 200428 Associated with an X-ray Burst from SGR 1935+2154
• Quasi-periodic oscillations of the X-ray burst from the magnetar SGR J1935+2154 and associated with the fast radio burst FRB 200428
• FRB 200428: an Impact between an Asteroid and a Magnetar
• Double-peaked Pulse Profile of FRB 200428: Synchrotron Maser Emission from Magnetized Shocks Encountering a Density Jump

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• Fast Radio Bursts from non-resonant Alfvén waves and synchrotron maser emission in the magnetar wind