Ground-based support for space telescopes

Space telescopes represent an important tool of modern astrophysics with many valuable inputs for the various fields of astronomy and astrophysics. There axe scientific applications however where the support by groud-based experiments and/or data archives can substantially improve the scientific value of satellite data. The ground-based experiments can e.g. monitor various celestial objects for their activity states and then provide inputs for following satellite observations during active states (Too targets of opportunity) of the sources. The second major application is represented by ground-based robotic telescopes with immediate response to satellite observations. The last field is represented by ground-based monitors and sky patrols which are able to provide simulatenous optical data as well as good sampling over long-time intervals. We report on the ongoing projects at the Astronomical Institute in Ondrejov in this direction including small-aperture robotic telescope BART.