But only FRB 121102 that was picked up by the Arecibo radio telescope in Puerto Rico in 2015 has repeated - until now. And the existence of a second repeater means 2012's was not a fluke or an instrument error - something is producing these repeating bursts of light, and it's clearly fixed in place over long periods of time.
Tom Landecker, CHIME team member from the National Research Council of Canada.
While most FRBs have been spotted at wavelengths of a few centimetres, the latest FRBs were detected at wavelengths of almost a metre, which opens up new lines of inquiry, according to the CHIME team.
But exactly what is causing these powerful radio signals that are travelling from distant galaxies isn't known. These effects vary with frequency, and many of them become stronger at lower frequencies. Both have what Ng calls "structure" - distinctive patterns in the timing and frequency of the signals.
Two FRB repeat themselves. These ultrastrong, ultrabright radio signals last only a few milliseconds and are thought to originate from billions of light-years away, though their precise source is unknown.
FRBs are not rare, as about 60 have been catalogued since 2007, but only one has been a repeating FRB so far, opening up debate as to what causes them.
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"FRBs were an unexpected mystery".
"At the end of a year we may have found 1,000 more bursts". Given that 13 FRBs were detected in such a short amount of time using pre-commissioning data, "just imagine what's waiting for us in the full-sensitivity data", she said.
"Extraordinary claims beg for extraordinary evidence, so for now, a simpler explanation based on known physical processes is preferred by most scientists", Pleunis said.
He added: "That tells us something about the environments and the sources".
Theories range from highly magnetized neutron stars blasted by gas streams from a nearby supermassive black hole, to signatures of technology developed by an advanced civilisation.
Another interesting point to keep in mind, according to Loeb, is that the first repeater exhibited an associated persistent radio source, whereas the new repeater did not.
As explained above, FRBs remain a largely unexplained phenomenon, and astronomers appear no closer to deciphering it.
What made them? Researchers aren't sure but believe they come from powerful astrophysical events far from Earth. "We have not solved the problem, but it's several more pieces in the puzzle".