  SITELLE is an imaging Fourier Transform Spectrometer installed at the
Canada-France-Hawaii Telescope since July 2015. It delivers spectral cubes
covering an 11'x11' field-of-view with a seeing-limited spatial resolution and
a tunable spectral resolution (R=1-10 000) in selected passbands of the visible
band (350-900 nm). We present an accurate picture of the calibration accuracy
of SITELLE's first data release. To this purpose, most of the operations of the
reduction pipeline (ORBS) are described in details.

Instrumentation and Methods for Astrophysics