It's likely some people called authorities when they thought they saw something in the sky, but there isn't data for those type of reports. (UFO wasn't even coined until the 1950s).
None reported.
None reported.
None reported.
None reported.
No UFO sighting was reported in AD 962...
No UFO sighting was reported in AD 985...
No UFO sighting was reported in AD 963...
No UFO sighting was reported in AD 964...
No UFO sighting was reported in AD 965...
No UFO sighting was reported in AD 966...
No UFO sighting was reported in AD 967...
No UFO sighting was reported in AD 970...