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"Perytons" are millisecond-duration transients of terrestrial origin, whosefrequency-swept emission mimics the dispersion of an astrophysical pulse thathas propagated through tenuous cold plasma. In fact, their similarity to FRB010724 had previously cast a shadow over the interpretation of "fast radiobursts," which otherwise appear to be of extragalactic origin. Until now, thephysical origin of the dispersion-mimicking perytons had remained a mystery. Wehave identified strong out-of-band emission at 2.3--2.5 GHz associated withseveral peryton events. Subsequent tests revealed that a peryton can begenerated at 1.4 GHz when a microwave oven door is opened prematurely and thetelescope is at an appropriate relative angle. Radio emission escaping frommicrowave ovens during the magnetron shut-down phase neatly explain all of theobserved properties of the peryton signals. Now that the peryton source hasbeen identified, we furthermore demonstrate that the microwaves on site couldnot have caused FRB 010724. This and other distinct observational differencesshow that FRBs are excellent candidates for genuine extragalactic transients.

Identifying the source of perytons at the Parkes radio telescope