  The detection of astrophysical neutrinos by IceCube in the TeV-PeV energy
range motivates the development of instruments for observing these particles at
higher energies. Moreover, the detection of very-high-energy (VHE) neutrinos
could potentially bring constraints on ultra-high energy cosmic rays (UHECRs)
source models. Tau neutrinos skimming the Earth under a shallow angle can be
detected 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 optical
Cherenkov signal originating from the EAS particles. To assess the feasibility
of the Earth-skimming technique from high altitudes, we developed a Cherenkov
telescope which was deployed on the Extreme Universe Space Observatory Super
Pressure Balloon 2 (EUSO-SPB2) from Wanaka, NZ, on May $13^{th}$. It is a
precursor for the Probe of Extreme Multi-Messenger Astrophysics. The 1m
diameter Cherenkov telescope for EUSO-SPB2 had a focal plane comprised of 512
silicon photomultipliers (SiPMs) covering a 6.4 x 12.8 square degree field of
view coupled to a 100 MS/s readout based on the GET switch capacitor ring
sampler. We discuss the calibration and commissioning of the telescope and its
in-flight performance.
