Explore the anticipated characteristics of electromagnetic counterparts resulting from black hole-neutron star (BHNS) mergers in this 32-minute lecture by Giancarlo Ghirlanda, presented at the Meeting of the National Research Group on Gravitational Waves. Delve into the complex physics behind these cosmic events and gain insights into their observable electromagnetic signatures. Examine the latest research and theoretical models that predict the properties of these elusive phenomena, enhancing your understanding of high-energy astrophysics and gravitational wave astronomy.