Spitzer too!
"Spitzer has a crucial role in this mission," says Dr. Grillmair. "Data from Spitzer will be able to tell us exactly what comes out of the comet, in a wavelength region that no one else can explore."
For roughly an hour around impact, Spitzer will taking in data every two seconds. This quick response will give astronomers a continuous view of the event. After that, Spitzer will slow down its data collection rate and broaden its wavelength coverage, allowing astronomers to identify cosmic particles with longer wavelength emission.
Spitzer will continue to collect data on the comet until August 17, 2005.
From; http://www.spitzer.caltech.edu/Media/happenings/20050630/