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2021NatAs...5..378L - Nature Astronomy, 5, 378-384 (2021/April-0)

HXMT identification of a non-thermal X-ray burst from SGR J1935+2154 and with FRB 200428.

LI C.K., LIN L., XIONG S.L., GE M.Y., LI X.B., LI T.P., LU F.J., ZHANG S.N., TUO Y.L., NANG Y., ZHANG B., XIAO S., CHEN Y., SONG L.M., XU Y.P., LIU C.Z., JIA S.M., CAO X.L., QU J.L., ZHANG S., GU Y.D., LIAO J.Y., ZHAO X.F., TAN Y., NIE J.Y., ZHAO H.S., ZHENG S.J., ZHENG Y.G., LUO Q., CAI C., LI B., XUE W.C., BU Q.C., CHANG Z., CHEN G., CHEN L., CHEN T.X., CHEN Y.B., CHEN Y.P., CUI W., CUI W.W., DENG J.K., DONG Y.W., DU Y.Y., FU M.X., GAO G.H., GAO H., GAO M., GU Y.D., GUAN J., GUO C.C., HAN D.W., HUANG Y., HUO J., JIANG L.H., JIANG W.C., JIN J., JIN Y.J., KONG L.D., LI G., LI M.S., LI W., LI X., LI X.F., LI Y.G., LI Z.W., LIANG X.H., LIU B.S., LIU G.Q., LIU H.W., LIU X.J., LIU Y.N., LU B., LU X.F., LUO T., MA X., MENG B., OU G., SAI N., SHANG R.C., SONG X.Y., SUN L., TAO L., WANG C., WANG G.F., WANG J., WANG W.S., WANG Y.S., WEN X.Y., WU B.B., WU B.Y., WU M., XIAO G.C., XU H., YANG J.W., YANG S., YANG Y.J., YANG Y.J., YI Q.B., YIN Q.Q., YOU Y., ZHANG W.C., ZHANG W.Z., ZHANG Y., ZHANG Y., ZHANG Y.F., ZHANG Y.J., ZHANG Z., ZHANG Z., ZHANG Z.L., ZHOU D.K., ZHOU J.F., ZHU Y., ZHU Y.X. and ZHUANG R.L.

Abstract (from CDS):

Fast radio bursts (FRBs) are short pulses observed in the radio band from cosmological distances. One class of models invokes soft gamma-ray repeaters (SGRs), or magnetars, as the sources of FRBs. Some radio pulses have been observed from some magnetars, but no FRB-like events have been detected in association with any magnetar burst, including one giant flare. Recently, a pair of FRB-like bursts (termed FRB 200428) separated by 29 milliseconds 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 having been emitted from SGR J1935+2154. The burst showed two hard peaks with a separation of 34 milliseconds, broadly consistent with that of the two bursts in FRB 200428. The delay time between the double radio peak and the X-ray peaks is about 8.62 s, fully consistent with the dispersion delay of FRB 200428. We thus identify the non-thermal X-ray burst to be associated with FRB 200428, whose high-energy counterpart is the two hard X-ray peaks. 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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