HXMT Identification of a non-thermal X-ray burst from SGR J1935+2154 and with FRB 200428. (arXiv:2005.11071v3 [astro-ph.HE] UPDATED)

HXMT Identification of a non-thermal X-ray burst from SGR J1935+2154 and with FRB 200428. (arXiv:2005.11071v3 [astro-ph.HE] UPDATED)
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Fast radio bursts (FRBs) are short pulses observed in radio band from
cosmological distances. One class of models invoke soft gamma-ray repeaters
(SGRs), or magnetars, as the sources of FRBs. Some radio pulses have been
observed from some magnetars, however, no FRB-like events had been detected in
association any magnetar burst, including one giant flare. Recently, a pair of
FRB-like bursts (FRB 200428 hereafter) separated by milliseconds (ms) were
detected from the general direction of the Galactic magnetar SGR J1935+2154.
Here we report the detection of a non-thermal X-ray burst in the 1-250 keV
energy band with the Insight-HXMT satellite, which we identify as emitted from
SGR J1935+2154. The burst showed two hard peaks with a separation of 34 ms,
broadly consistent with that of the two bursts in FRB 200428. The delay time
between the double radio and X-ray peaks is about 8.57 s, fully consistent with
the dispersion delay of FRB 200428. We thus identify the non-thermal X-ray
burst is associated with FRB 200428 whose high energy counterpart is the two
hard peaks in X-ray. Our results suggest that the non-thermal X-ray burst and
FRB 200428 share the same physical origin in an explosive event from SGR
J1935+2154.

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