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Due to the limited field of view (FoV) of Cherenkov telescopes, the timeneeded to achieve target sensitivity for surveys of the extragalactic andGalactic sky is large. To optimize the time spent to perform such surveys, aso-called "divergent mode" of the Cherenkov Telescope Array Observatory (CTAO)was proposed as an alternative observation strategy to the traditional parallelpointing. In the divergent mode, each telescope points to a position in the skythat is slightly offset, in the outward direction, from the original center ofthe field of view. This bring the advantage of increasing the totalinstantaneous arrays' FoV. From an enlarged field of view also benefits thesearch for very-high-energy transient sources, making it possible to coverlarge sky regions in follow-up observations, or to quickly cover theprobability sky map in case of Gamma Ray Bursts (GRB), Gravitational Waves(GW), and other transient events. In this contribution, we present the proposedimplementation of the divergent pointing mode and its first preliminaryperformance estimation for the southern CTAO array.

Performance study update of observations in divergent mode for the Cherenkov Telescope Array