"There is definitely a difference between the sources, with some being more prolific than others," physicist Ziggy Pleunis of McGill University told Science Alert. "We already knew from FRB 121102 that the bursts can be very clustered: sometimes the source doesn't burst for hours and hours and then suddenly you get multiple bursts in a short amount of time. We have observed the same thing for FRB 180916.J0158+65, for which we report 10 bursts in this paper."