Insight-HXMT Identification of a non-thermal X-ray burst from SGR J1935+2154 and with FRB 200428
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.
Authors
C.K. Li, L. Lin, S.L. Xiong, M.Y. Ge, X.B. Li, T.P. Li, F.J. Lu, S.N. Zhang, Y.L. Tuo, Y. Nang, B. Zhang, S. Xiao, Y. Chen, L.M. Song, Y.P. Xu, C.Z. Liu, S.M. Jia, X.L. Cao, J.L. Qu, S. Zhang