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The detection of astrophysical neutrinos by IceCube in the TeV-PeV energyrange motivates the development of instruments for observing these particles athigher energies. Moreover, the detection of very-high-energy (VHE) neutrinoscould potentially bring constraints on ultra-high energy cosmic rays (UHECRs)source models. Tau neutrinos skimming the Earth under a shallow angle can bedetected through the decay of a tau resulting in an extensive air shower (EAS)in the atmosphere. The EAS can be detected by capturing some of the opticalCherenkov signal originating from the EAS particles. To assess the feasibilityof the Earth-skimming technique from high altitudes, we developed a Cherenkovtelescope which was deployed on the Extreme Universe Space Observatory SuperPressure Balloon 2 (EUSO-SPB2) from Wanaka, NZ, on May $13^{th}$. It is aprecursor for the Probe of Extreme Multi-Messenger Astrophysics. The 1mdiameter Cherenkov telescope for EUSO-SPB2 had a focal plane comprised of 512silicon photomultipliers (SiPMs) covering a 6.4 x 12.8 square degree field ofview coupled to a 100 MS/s readout based on the GET switch capacitor ringsampler. We discuss the calibration and commissioning of the telescope and itsin-flight performance.

Commissioning, Calibration, and Performance of the Cherenkov Telescope on EUSO-SPB2