Recently, one fast radio burst (FRB), FRB 200428, was detected from the Galactic magnetar soft gamma-ray repeater (SGR) J1935+2154 during X-ray burst. This suggests that magnetars can make FRBs. On other hand, majority of bursts SGR are not associated with One possible reason for such rarity FRB–SGR–burst associations is emission much more narrowly beamed than SGR–burst emission. If an interpre...

I show that the relativistic winds of newly born magnetars (neutron stars with petagauss surface magnetic fields) with initial spin rates close to the centrifugal breakup limit, occurring in all normal galaxies with massive star formation, can provide a source of ultrarelativistic light ions with an E injection spectrum, steepening to E at higher energies, with an upper cutoff at 10 − 10 eV. In...