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IceAct is a proposed surface array of compact (50 cm diameter) andcost-effective Imaging Air Cherenkov Telescopes installed at the site of theIceCube Neutrino Observatory at the geographic South Pole. Since January 2019,two IceAct telescope demonstrators, featuring 61 silicon pho- tomultiplier(SiPM) pixels have been taking data in the center of the IceTop surface arrayduring the austral winter. We present the first analysis of hybrid cosmic rayevents detected by the IceAct imaging air-Cherenkov telescopes in coincidencewith the IceCube Neutrino Observatory, includ- ing the IceTop surface array andthe IceCube in-ice array. By featuring an energy threshold of about 10 TeV anda wide field-of-view, the IceAct telescopes show promising capabilities of im-proving current cosmic ray composition studies: measuring the Cherenkov lightemissions in the atmosphere adds new information about the shower developmentnot accessible with the current detectors, enabling significantly betterprimary particle type discrimination on a statistical basis. The hybridmeasurement also allows for detailed feasibility studies of detectorcross-calibration and of cosmic ray veto capabilities for neutrino analyses. Wepresent the performance of the telescopes, the results from the analysis of twoyears of data, and an outlook of a hybrid simulation for a future telescopearray.

Hybrid cosmic ray measurements using the IceAct telescopes in coincidence with the IceCube and IceTop detectors