You'll find this in the collection, Deep Navigation.

A rather brief short story about an observatory near Jupiter that listens to broadcasts from other galaxies.

I get the idea that this should be a prequel to something: not sure what the point is being on its own.   Ho hum.

Next in the timeline from Alastair, it's The Real Story from 2002. ( )

A robotic caretaker of a sensitive deep space receiver has a dull job enlivened by the occasional alien contact. Very short and powerful. ( )