What is the source of the fast radio burst (FRB)?

black hole
blitzars
pulsars
its source is unknown
A fast radio burst (FRB) is a high-energy astrophysical phenomenon manifested as a transient radio pulse lasting a few milliseconds on average. The origin of the FRBs has yet to be determined. Proposals range from a rapidly rotating neutron star and a black hole to an extraterrestrial intelligence.
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black hole
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its source is unknown
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