Mars Impactor: Rovers at the Ready Live Science

That possible impact of an asteroid on Mars at the end of January would be quite a show for the orbiters and rovers now on duty at the red planet.
I asked Steve Squyres – lead scientist of the Spirit and Opportunity Mars rovers at Cornell — what he thought might be observable by the robots – at that time, in their fourth year of operations.
“If an impact takes place, the most likely thing for us to observe would be dust that has been lofted into the atmosphere by the impact event and then carried over the rover sites by wind,” Squyres said. “So if there is an impact, we’ll increase our monitoring of dust in the atmosphere to see if we can observe any effects.”