  The first sensors of the IceCube neutrino observatory were deployed at the
South Pole during the austral summer of 2004-05 and have been producing data
since February 2005. One string of 60 sensors buried in the ice and a surface
array of 8 ice Cherenkov tanks took data until December 2005 when deployment of
the next set of strings and tanks began. We have analyzed these data,
demonstrating that the performance of the system meets or exceeds design
requirements. Times are determined across the whole array to a relative
precision of better than 3 nanoseconds, allowing reconstruction of muon tracks
and light bursts in the ice, of air-showers in the surface array and of events
seen in coincidence by surface and deep-ice detectors separated by up to 2.5
km.
