Collaboration id: BBGP Collaboration name: Babak, Barack, Gair and Porter Collaboration authors: Stanislav Babak (1) Leor Barack (2) Jonathan Gair (3,1) Edward Porter (1) (1) Max-Planck-Institut fuer Gravitationsphysik, Am Muehlenberg 1, 14476, Potsda m, Germany (2) School of Mathematics, University of Southampton, Southampton, SO171BJ, UK (3) Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK