1. Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK
2. European Southern Observatory, Karl-Schwarzschild Strasse 2, D-85748 Garching bei München, Germany
3. Max-Planck Institut für Astrophysik, Karl-Schwarzschild Strasse 1, D-85748 Garching bei München, Germany
4. Department of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK
5. Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching bei München, Germany
6. Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena, Chile
7. Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA
8. Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX, UK
9. PITT PACC, Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA
10. Las Cumbres Observatory, 6740 Cortona Dr Ste 102, Goleta, CA 93117-5575, USA
11. Department of Physics, University of California, Santa Barbara, CA 93106-9530, USA
12. Space Science Applications Laboratory, The Aerospace Corporation, PO Box 92957, Los Angeles, CA 90009, USA
13. The Oskar Klein Centre, Department of Astronomy, Stockholm University, AlbaNova, SE-10691 Stockholm, Sweden