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Results from the Cherenkov telescope flown on the Extreme Universe Space Observatory on a Super Pressure Balloon 2
Heibges, Tobias
Heibges, Tobias
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2025
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The Extreme Universe Space Observatory on a Super Pressure Balloon 2 was launched on May 13, 2023, to search for very-high to ultra-high energy cosmic rays and neutrinos. Despite an early termination after only $\sim36$\,hours, all major instruments could be activated, and collected valuable data. This work presents an analysis of expected above-the-limb cosmic ray events, a limit on the diffuse neutrino flux, and constraints on transient sources using the Cherenkov Telescope.
The Cherenkov Telescope searched for Earth-skimming neutrinos below Earth's limb and extensive air showers from cosmic rays above the horizon. To facilitate transient source follow-up, we developed the Neutrino Target Scheduler, although follow-ups were hindered by a loss of pointing control during the second night of flight. An extensive simulation methodology has been developed to determine the expected number of above-the-limb cosmic ray induced events as well as calculate a limit on the diffuse neutrino flux and target neutrino fluence. These simulations were informed by the data collected using the Cherenkov Telescope, and an analysis of this data is presented.
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