The origin of radio bursts like this one remain a vexing astronomical mystery.
There are strange radio signals that ping us here on Earth. It’s possible to sense them thousands of times every day, if astronomers know where to find them.
Fast radio bursts are brief: Most last a second or two, or even less. They are bursts: When they’re created, they’re thought to be as energetic as our sun. That said, by the time the signals reach us, they’ve generally far weaker than our terrestrial radio waves—which partly explains why they’ve taken so long to find.
Making matters more complex is that every one of those hundreds of FRBs is a different beast. Some flash once, never to be seen again. Some flash a few times. Some stay silent for days, then light up randomly for a short period, then go silent again. And some flash dozens hundreds of times in rapid succession. FRB 20201124A is firmly in the latter category.Astronomers first saw it in November 2020 .
Repeating FRBs aren’t new, but FAST’s observations saw a number of unique fingerprints in the radio waves that suggested something was playing with them. “There are some unique characteristics of FRB 20201124A, which motivates us to create a model for it,” says Wang.Wang and his colleagues tried their hand at a model. Theirs suggests that FRB 20201124A does hail from a magnetar—but not a magnetar alone.
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