If you go on patrol in the Cosmodrone at 4:01PST and stay where you spawn and look behind you you can see a black ship fly away, I'm guessing it's xûr.
It flys away pretty slowly so I pulled out a Gjallarhorn and noticed when I aimed at the ship it made the beeping noises as if it was being tracked so I shot it. It indicated that it got damage but showed no numbers and didn't blow up, similar to shooting a skiff.
Edit:
Got the screenshot. sorry I couldn't get it up earlier, I was at work. [url=http://youtu.be/dQw4w9WgXcQ]http://m.imgur.com/gallery/HC5HAYe[/url]
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Hive ship, you can see them dotted about all over, even on crucible maps