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The Gamma-ray Cherenkov Telescope (GCT) is a candidate for the Small SizeTelescopes (SSTs) of the Cherenkov Telescope Array (CTA). Its purpose is toextend the sensitivity of CTA to gamma-ray energies reaching 300 TeV. Itsdual-mirror optical design and curved focal plane enables the use of a compactcamera of 0.4 m diameter, while achieving a field of view of above 8 degrees.Through the use of the digitising TARGET ASICs, the Cherenkov flash is sampledonce per nanosecond continuously and then digitised when triggering conditionsare met within the analogue outputs of the photosensors. Entire waveforms(typically covering 96 ns) for all 2048 pixels are then stored for analysis,allowing for a broad spectrum of investigations to be performed on the data.Two prototypes of the GCT camera are under development, with differingphotosensors: Multi-Anode Photomultipliers (MAPMs) and Silicon Photomultipliers(SiPMs). During November 2015, the GCT MAPM (GCT-M) prototype camera wasintegrated onto the GCT structure at the Observatoire de Paris-Meudon, where itobserved the first Cherenkov light detected by a prototype instrument for CTA.

Inauguration and First Light of the GCT-M Prototype for the Cherenkov Telescope Array