HXMT Identification of a non-thermal X-ray burst from SGR J1935+2154 and with FRB 200428
Creators: name: Li, C. K.
name: Lin, L.
name: Xiong, S. L.
name: Ge, M. Y.
name: Li, X. B.
name: Li, T. P.
name: Lu, F. J.
name: Zhang, S. N.
name: Tuo, Y. L.
name: Nang, Y.
name: Zhang, B.
name: Xiao, S.
name: Chen, Y.
name: Song, L. M.
name: Xu, Y. P.
name: Liu, C. Z.
name: Jia, S. M.
name: Cao, X. L.
name: Qu, J. L.
name: Zhang, S.
name: Gu, Y. D.
name: Liao, J. Y.
name: Zhao, X. F.
name: Tan, Y.
name: Nie, J. Y.
name: Zhao, H. S.
name: Zheng, S. J.
name: Zheng, Y. G.
name: Luo, Q.
name: Cai, C.
name: Li, B.
name: Xue, W. C.
name: Bu, Q. C.
name: Chang, Z.
name: Chen, G.
name: Chen, T. X.
name: Chen, Y. B.
name: Chen, Y. P.
name: Cui, W.
name: Cui, W. W.
name: Deng, J. K.
name: Dong, Y. W.
name: Du, Y. Y.
name: Fu, M. X.
name: Gao, G. H.
name: Gao, H.
name: Gao, M.
name: Gu, Y. D.
name: Guan, J.
name: Guo, C. C.
name: Han, D. W.
name: Huang, Y.
name: Huo, J.
name: Jiang, L. H.
name: Jiang, W. C.
name: Jin, J.
name: Jin, Y. J.
name: Kong, L. D.
name: Li, G.
name: Li, M. S.
name: Li, W.
name: Li, X.
name: Li, X. F.
name: Li, Y. G.
name: Li, Z. W.
name: Liang, X. H.
name: Liu, B. S.
name: Liu, G. Q.
name: Liu, H. W.
name: Liu, X. J.
name: Liu, Y. N.
name: Lu, B.
name: Lu, X. F.
name: Luo, T.
name: Ma, X.
name: Meng, B.
name: Ou, G.
name: Sai, N.
name: Shang, R. C.
name: Song, X. Y.
name: Sun, L.
name: Tao, L.
name: Wang, C.
name: Wang, G. F.
name: Wang, J.
name: Wang, W. S.
name: Wang, Y. S.
name: Wen, X. Y.
name: Wu, B. B.
name: Wu, B. Y.
name: Wu, M.
name: Xiao, G. C.
name: Xu, H.
name: Yang, J. W.
name: Yang, S.
name: Yang, Y. J.
name: Yang, Yi-Jung
name: Yi, Q. B.
name: Yin, Q. Q.
name: You, Y.
name: Zhang, A. M.
name: Zhang, C. M.
name: Zhang, F.
name: Zhang, H. M.
name: Zhang, J.
name: Zhang, T.
name: Zhang, W.
name: Zhang, W. C.
name: Zhang, W. Z.
name: Zhang, Y.
name: Zhang, Yue
name: Zhang, Y. F.
name: Zhang, Y. J.
name: Zhang, Z.
name: Zhang, Zhi
name: Zhang, Z. L.
name: Zhou, D. K.
name: Zhou, J. F.
name: Zhu, Y.
name: Zhu, Y. X.
name: Zhuang, R. L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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.
description: 24 pages, 9 figures, 6 tables; initial submission to a journal on May 9th, 2020. Significant changes include updated localization and detailed spectral evolution of the X-ray burst, and better determination of the two narrow X-ray peaks corresponding to the two radio pulses. Conclusions are strengthened. Nature Astronomy online on Feb. 18, 2021