Optical Performances of Slewing Mirror Telescope for UFFO-Pathfinder
  The Ultra-Fast Flash Observatory-Pathfinder (UFFO-P) is to be launched
onboard Lomonosov spacecraft in November 2011. It is to measure early
UV/Optical photons from Gamma Ray Bursts (GRBs). Slewing Mirror Telescope (SMT)
is one of two instruments designed for detection of UV/Optical images of the
GRBs. SMT is a Ritchey-Chr\'etien telescope of 100 mm in diameter with a
motorized slewing mirror at the entrance providing 17\times17 arcmin2 in Field
of View (FOV) and 4 arcsec in pixel resolution. Its sky coverage can be further
expanded up to 35 degrees in FOV by tilting a motorized slewing mirror. All
mirrors were fabricated to about RMS 0.02 waves in wave front error (WFE) and
84.7% (in average reflectivity) over 200nm~650nm range. SMT was aligned to RMS
0.05 waves in WFE (test wavelength 632.8nm). From the static gravity test
result, SMT optics system is expected to survive during launch. The technical
details of SMT assembly and laboratory performance test results are reported.
