Wednesday's fireball over the US southwest was not UARS

A brilliant fireball was seen and filmed over the US southwest (Arizona, Nevada and California) last night. Some media suggest it could be connected to UARS, the US satellite about to plunge down in the atmosphere later this month.

It was definitely not UARS though. Not only was UARS still being tracked and hence in orbit after the fireball appeared (approx. 19:45 MST on the 14th, or 2:45 UTC on the 15th): but it was simply not passing over that part of the USA at that time. It was hence not UARS, or a piece of UARS.