Large zenith angle observation of the PeVatron candidate SNR G106.3+2.7 with the LST-1 and the MAGIC telescopes

Imaging Atmospheric Cherenkov Telescopes (IACTs) are ideal for investigating the nature of moderately extended gamma-ray sources at very high energy thanks to their optimal angular and energy resolution compared to ground array detectors. The Supernova Remnant SNR G106.3+2.7 is one of the most promising Galactic hadronic PeVatron candidates. We carried out observations using the Large-Sized Telescope prototype (LST-1) of the Cherenkov Telescope Array Observatory (CTAO) and the two neighboring IACTs of the MAGIC experiment at large zenith angle (LZA) to enhance the effective area at energies above tens of TeV. Data reconstruction and analysis are challenging due to the increased atmospheric depth and strong dependency on the zenith angle of the image properties. Therefore, specialized LZA reconstruction and analysis tools have been developed. We present a joint analysis of data from several telescope combinations, based on currently available statistics, including a preliminary study of the energy-dependent morphology and spectral models.