A freely precessing magnetar following an X-ray outburst.

Magnetars-highly magnetized neutron stars-are thought to be the most likely progenitors for fast radio bursts (FRBs). Freely precessing magnetars are further invoked to explain the repeating FRBs. We report here on new high-cadence radio observations of the magnetar XTE J1810-197 recorded shortly after an X-ray outburst.