(Theories as to the source of the signals had ranged from evaporating black holes to extraterrestrial communication and mergers of neutron stars.
Now researchers at the Parkes Observatory claim they have finally found the source of these 'alien' signals - it was the microwave in the staff kitchen.
Seemingly, if you open the microwave door before the timer goes off a brief burst of radiowaves can be generated, because the magnetron hasn't completely turned off, and as a result, the microwave oven briefly transmits radio waves into the open air.