Optical Performances of Slewing Mirror Telescope for UFFO UFFO-Pathfinder

摘要

Abstract: ct: The Ultra Ultra-Fast Flash Observa Observatory tory-Pathfinder (UFFO UFFO-P) is to be launched onboard Lomonosov spacecraft in November 2011 2011. It is to measure . early UV/Optical photons from Gamma Ray Bursts (GRBs). Slewing Mirror Telescope (SMT SMT) is one of two instrumen ) instruments desig ts designed for detection of ned UV/Optical images of the GRBs. SMT is a Rit Ritchey chey-Chré Chrétien tien telescope of 100 mm in diameter with a m mo- otorized slewing mirror at the en torized entrance providing trance 17 ×17 arcmin 2 in Field of View (FOV) and 4 arcsec in pixel resolution. It Its sky coverage s can be further e expanded panded up to 35 degrees in FOV by tilting a motorized slewing mir mirror. ror. All m mirror irrors were s fabricated to about RMS 0.02 wave waves in wave front error (WFE) and 84.7% (in average reflectivity reflectivity) over ) 200nm~650 650nm range. nm SMT was aligned to RMS 0.05 wa waves ves in WFE (test wavelength 632.8nm) 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 r re- eported ported.