  The Gamma-ray Cherenkov Telescope (GCT) is an innovative dual-mirror solution
proposed for the Small Size Telescopes of the future Cherenkov Telescope Array
(CTA), capable of imaging the showers induced by cosmic gamma-rays with
energies from a few TeV up to 300 TeV. The Schwarzschild Couder design on which
the telescope optical design is based makes possible the construction of a fast
telescope (primary mirror diameter 4 m, focal length 2.3 m) with a plate scale
well matched to compact photosensors, such as multi anode or silicon
photomultipliers (MAPMs and SiPMs, respectively) for the camera. The prototype
GCT on Meudon's site of the Observatoire de Paris saw first Cherenkov light
from air showers in November 2015, using an MAPM based camera. In this
contribution, we firstly report on the prototype GCT telescope's performance
during its assessment phase. Secondly, we present the telescope configuration
during a campaign of observations held in spring 2017. Finally, we describe
studies of the telescope structure, such as the pointing and tracking
performance.
