(Welcome to the High Energy Network (HEN) forum! This section focuses on the science and observation of optical counterparts to high energy astronomical transients like Gamma Ray Bursts (GRB), X-ray flares (e.g. the ones from Active Galactic Nuclei (AGN)), and lately also other multi-messenger astronomy in connection with Gravitational Wave events or Neutrino events. And we are waiting and preparing to observe the next galactic supernova.