You can't discount it that easily: they report bursts unobserved by other instruments, which could be a second burst mechanism that hasn't been seen before due

You can't discount it that easily: they report bursts unobserved by other instruments, which could be a second burst mechanism that hasn't been seen before due to its lower flux. Also FAST has discovered about 100 new pulsars, in at least one case they detected a pulsar at a position Arecibo had observed three times already and not finding anything.