An X-ray burst from a magnetar enlightening the mechanism of fast radio bursts

Fast radio bursts (FRBs) are millisecond pulses originating from powerful enigmatic sources at extragalactic distances. Neutron stars with large magnetic fields (magnetars) have been considered as the powering FRBs, but connection requires further substantiation. Here we report detection by AGILE satellite on 28 April 2020 of an X-ray burst in temporal coincidence a bright FRB-like Galactic magnetar SGR 1935+2154. The observed hard band (18–60 keV) lasted about 0.5 s, it is spectrally cut off above 80 keV and implies isotropically emitted energy 1040 erg. This event demonstrates that can produce bursts. It also suggests FRBs associated magnetars emit We discuss 1935+2154 context low–intermediate energies range 1038–1040 Magnetars B ? 1015 G may power these new data search for emission presented. constrain bursting nearby FRB 180916 to be less than 1046 erg, smaller giant flares magnetars. In 2020, registered temporally coincident As seen X-rays, was had