Unexpected Circular Radio Objects at High Galactic Latitude
  We have found a class of circular radio objects in the Evolutionary Map of
the Universe Pilot Survey, using the Australian Square Kilometre Array
Pathfinder telescope. The objects appear in radio images as circular
edge-brightened discs, about one arcmin diameter, that are unlike other objects
previously reported in the literature. We explore several possible mechanisms
that might cause these objects, but none seems to be a compelling explanation.
