1. Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK
2. Institute for Astronomy, UKIRT Observatory, 640 North A'ohoku Place, Hilo, HI 96720, USA
3. Gemini Observatory, Northern Operations Center, 670 North A'ohoku Place, Hilo, HI 96720, USA
4. CRESST II and X-ray Astrophysics Laboratory, NASA/GSFC, Greenbelt, MD 20771, USA
5. Department of Physics, Institute for Astrophysics and Computational Sciences, The Catholic University of America, Washington, DC 20064, USA
6. Astrophysics Science Division, NASA/GSFC, Greenbelt, MD 20771, USA
7. Department of Physics, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
8. Département de physique and Centre de Recherche en Astrophysique du Québec (CRAQ), Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, QC H3C 3J7, Canada
9. Department of Physics and Astronomy, University of Sheffield, Hounsfield Road, Sheffield S3 7RH, UK
10. Department of Physics, Embry-Riddle Aeronautical University, Prescott, AZ 86301, USA
11. Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA
12. Armagh Observatory and Planetarium, College Hill, Armagh BT61 9DG, UK
13. School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
14. Max Planck Institute for Radio Astronomy, Auf dem Hügel 69, D-53121 Bonn, Germany