I think they're looking for changes in the sky from those locations. Supernovae for example leave visible traces--clouds, rings, shock fronts, etc and emit all kinds of radio and x-rays. But FRB's not so much, it would seem, so far anyway.
I think this refers to a quick search through observations from other telescopes observing other EM frequency ranges ... to see if they saw short energy bursts at the same times. That's becoming common for, e.g., LIGO gravity wave observations.
The three bursts 1ms apart don't appear to be natural (or at least, we don't currently understand how they may occur naturally). The signal may be extraterrestrial.
Definitely ample-grounds for speculation which I'll personally stay out of, but the phenomenon is a major puzzle in astrophysics right now. This is just another progression in our means to detect it.
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[ 3.4 ms ] story [ 35.9 ms ] threadWhat is a "transient" in this context?
https://en.wikipedia.org/wiki/Fast_radio_burst