# Muon calibration of the ASTRI-Horn telescope: preliminary results

## TL;DR

This paper presents preliminary results on muon calibration of the ASTRI-Horn telescope, demonstrating the feasibility of using muons for calibration through simulations and initial data analysis.

## Contribution

It introduces a novel muon calibration approach for the ASTRI-Horn telescope, validated by simulations and initial observational data.

## Key findings

- Muon events detected validate simulation results.
- Muon calibration is feasible for the ASTRI-Horn telescope.
- Preliminary data confirms the potential of muon-based calibration.

## Abstract

Astri-Horn is a Small-Sized Telescope (SST) for very-high energy gamma-ray astronomy installed in Italy at the INAF "M.C. Fracastoro" observing station (Mt. Etna, Sicily). The ASTRI-Horn telescope is characterized by a dual-mirror optical system and a curved focal surface covered by SiPM sensors managed by a innovative fast front-end electronics. Dedicated studies were performed to verify the feasibility of the calibration through muons on the relatively small size of the primary mirror (~4 m diameter), as in the case of larger Cherenkov telescopes. A number of tests were performed using simulations of the atmospheric showers with the CORSIKA package and of the telescope response with a dedicated simulator. In this contribution we present a preliminary analysis of muon events detected by ASTRI-Horn during the regular scientific data taking performed in December 2018 and March 2019. These muon events validate the results obtained with the simulations and definitively confirm the feasibility of calibrating the ASTRI-Horn SST telescope with muons.