Fireball over Colorado:
According to NORAD sources cited on the Fox Colorado website, the fireball over was caused by the booster stage that launched the COROT satellite into orbit.
The COROT telescope was launched on December 27 and will - amongst other scienfific goals - try to find extrasolar planets by detecting their transits in front of their home suns. An interesting mission that has gone tragically underreported in the Bad Astronomy Blog. (@BA: Nudge, nudge…)
More to be found at http://smsc.cnes.fr/COROT/
Greetings from good old Europe