Abstract

ABSTRACT The Optical System for Imaging and low Resolution Integrated Spectroscopy (OSIRIS) is the first light instrument for the 10.4 meters Gran Telescopio de Canarias (GTC). It's a 8.5 x 8.5 arc-min visible camera; a set of grisms provides low resolution spectroscopic capability. In this contribution the accessories and mountings for alignment are presented as well as the techniques used. Also, a complete characterization of the system at laboratory for image quality, spectral and spatial resolution, and image movement, etc. are showed Keywords: Spectrograph, camera, AIV, optical test, GTC 1. INTRODUCTION OSIRIS 1 is a general purpose instrument for the ten meters Spanish telescope (GTC). Direct imaging and spectroscopic observing modes will be possible using the instrument. Figure 1: General idealized and real OSIRIS view. Light coming from the telescope focal plane, where slits are located, reflects on the collimator and on the folder flat mirror. Collimated light passes through conventional filters and TF or Grism and the camera form image on the detector.

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