The first Gaia data release - DR1 and Serbian-Bulgarian astronomical activities Damljanovic Goran Astronomical Observatory Abstract: The ESA Gaia mission is surveying the full sky since July 2014. It is astronomically, photometrically and spectroscopically European project. Also, it is revolution in astrometry, our understanding of the Milky Way galaxy, stellar physics, the Solar system bodies, etc. At September 2016, the fist Gaia data release - DR1 has been made available using about two years of Gaia data. At the other hand, it is of importance the synergy between Gaia and ground-based astronomical observations. Because of it, the regional astronomical cooperation "Serbian-Bulgarian mini-network telescopes" (head is Dr. G.Damljanovic) was started at 2013. The main results of the Gaia DR1 and mentioned cooperation are presented, here.