The MAGIC telescopes exploit the cosmic gamma rays impacting our atmosphere to monitor the night sky at very high energies. These particles generate electromagnetic showers, which cause the emission of Cherenkov radiation measured by MAGIC. Shower properties change when shifting from zenith to horizon, which enables the detection of the highest-energy particles. The presented research focuses
on the largest zenith angle observations with the MAGIC telescopes, as well as on the technical improvements needed to optimise the data analysis. This will make it
possible to understand some of the relevant systematics in such conditions, and in perspective, to enhance MAGIC sensitivity and to improve science results
