Who or what is sending these signals?

Is it just a pulsar or something else?  There has been a lot of discussion of the new FRB they found at a distance of 6 billion light years.  And a reminder FRBs are extremely rare (at least in the number we were able to detect).  However astronomers have now spotted something they have never seen!

A team of astronomers reported it has come upon 10 fast radio bursts that appear to come from both far away and a solitary source.

Ever since a radio burst coming from space was first identified 15 years ago, many astronomers have been searching for more, some hoping to detect repeat signals from the same entity. While the latter sort of effort has not proven successful over the past decade and a half, that recently changed. A team reported it has come upon 10 radio blips that appear to come from both far away and a solitary source. The signals are technically called fast radio bursts, or FRBs and are often attributed to truly enormous cataclysms occurring in the universe, such as exploding stars. As the object creating the burst is decimated in the process, it would explain why up until now only once-occurring signals have been detected. However, the potential existence of repeat signals indicates that other source possibilities exist. The team suspects the origin of the multiple signals may be, according to the CBC, “a rotating neutron star like a pulsar, but much farther away.” It also suggests there could be different types of FRBs.

Ok so even this team says there are different types of FRBs.  What do they mean by that and what do they think is sending the different type of signal?

Check back on this topic as new information comes in and as they get more data!