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EUSO-SPB2 Fluorescence Telescope Calibration and Field Tests

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arxiv 2310.06209 v1 pith:EYXSQC6I submitted 2023-10-09 astro-ph.IM

Viktoria Kungel , Matteo Battisti , George Filippatos , Tobias Heibges , Evgeny Kuznetsov , Marco Mese , Stephan S. Meyer , Etienne Parizot
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Valentina Scotti Patrick Sternberg Lawrence Wiencke (for the JEM-EUSO Collaboration)
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classification astro-ph.IM
keywords telescopecalibrationeuso-spb2fieldtestsextremefluorescencelooking
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The Extreme Universe Space Observatory on a Super Pressure Balloon 2 (EUSO-SPB2), successfully launched from Wanaka, New Zealand on May 13, 2022, is a precursor for a space-based astroparticle observatory such as the Probe Of Extreme Multi-Messenger Astrophysics (POEMMA). EUSO-SPB2 flew two custom telescopes. Both have UV/UV-visible sensitivity and feature Schmidt optics. The Fluorescence Telescope (FT) measures ultra-high energy cosmic rays by looking down. The \v{C}erenkov Telescope (CT) searches for neutrino signatures by looking toward Earth's limb. The two telescopes each have a 1 m diameter entrance pupil and segmented glass mirrors that collect light from extensive air showers at the PeV and EeV-scale. Here we describe the FT telescope optics together with the results of the FT field tests at the Utah Telescope Array (TA) site from August/September 2022. The FT recorded the night sky background, lasers, and artificial point sources. The field tests included an absolute photometric calibration of the FT telescope that is compared to a piece-wise laboratory calibration.

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Cited by 2 Pith papers

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  1. The Extreme Universe Observatory on a Super-Pressure Balloon II: Mission, Payload, and Flight

    astro-ph.HE 2025-05 conditional novelty 6.0 of 10

    A short balloon flight commissioned a fluorescence and a Cherenkov telescope at 33 km altitude and returned about 10 candidate cosmic-ray extensive air shower events from Cherenkov light.

  2. EUSO-SPB2 Cosmic Ray Searches and Observations

    astro-ph.IM 2025-09 conditional novelty 3.0 of 10

    A 37-hour balloon flight validated a SiPM Cherenkov telescope by finding 14 simulation-consistent air-shower flash events, with no UHECRs in the fluorescence channel.

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