This is a new way to analyze the data we have on FRBs. Instead of just looking at how bright something is, we're also looking at the angle of the light's vibrating electromagnetic waves. It gives you additional information about how and where that light is produced and what it has passed through on its journey to us over many millions of light years.
Astronomers have over a thousand [FRBs] to date; some come from sources that repeatedly emit FRBs, while others seem to burst once and go silent. You can produce this sort of sudden surge of energy by destroying something.
The existence of repeating sources suggests that at least some of them are produced by an object that survives the event. That has led to a focus on compact objects, like neutron stars and black holes-especially a class of neutron stars called magnetars-as likely sources.
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