Gaia data release 1 summary of the astrometric, photometric, and survey properties

Andrew G. Brown, A. Vallenari, T. Prusti, JHJ de Bruijne, F. Mignard, R. Drimmel, C. Babusiaux, CAL Bailer-Jones, U. Bastian, Erik Høg, G. Comoretto, H.I. Siddiqui, L. Bramante, E. Anglade Varela, E. Licata, H.E.P. Lindstrøm, M. Ramos-Lerate, B. Massart, M. ter Linden