We study the temporal and spectral characteristics of the X-ray emission of the hard X-ray transient binary system IGR~J17503--2636 to characterize its variability and spectral properties. This source was observed by XMM-Newton on April 3, 2020 with an exposure time of ${\sim}27~\mathrm{ks}$. The light curves show variability on several timescales

In December 2023 the Large-Sized Telescope prototype (LST-1) of the Cherenkov Telescope Array Observatory (CTAO) observed the distant (z=0.997) Flat Spectrum Radio Quasar (FSRQ) OP 313 following an alert of increased activity by the Fermi-LAT Space Telescope. Thanks to its very low energy threshold and large effective area LST-1 detected very-high

The sites and mechanisms under which cosmic rays are accelerated up to relativistic energies are still under debate. Microquasar jets have been assessed as possible sources that may contribute to the total cosmic ray population, which is currently believed to be mainly originated in supernova remnants. We show preliminary results on the neutron