1. Leiden Observatory, Leiden University , Postbus 9513, NL-2300 RA Leiden , the Netherlands
2. Deutsches Elektronen Synchrotron DESY , Platanenallee 6, D-15738 Zeuthen , Germany
3. Institut für Physik, Humboldt-Universität zu Berlin , D-12489 Berlin , Germany
4. Division of Physics, Mathematics, and Astronomy, California Institute of Technology , Pasadena, CA 91125 , USA
5. Max-Planck-Institut für Astrophysik , Karl-Schwarzschild-Str 1, D-85741 Garching , Germany
6. Space Research Institute, Russian Academy of Sciences , Profsoyuznaya ul. 84/32, Moscow 117997 , Russia
7. Department of Astronomy and Space Science, Chungbuk National University , Cheongju 361-763 , Republic of Korea
8. Harvard-Smithsonian Center for Astrophysics , 60 Garden Street, Cambridge, MA 02138 , USA
9. Cahill Center for Astrophysics, California Institute of Technology , MC 249-17, 1200 E California Boulevard, Pasadena, CA 91125 , USA
10. Fakultät für Physik & Astronomie , Ruhr-Universität Bochum, D-44780 Bochum , Germany
11. Space Telescope Science Institute , 3700 San Martin Dr., Baltimore, MD 21218 , USA
12. Department of Astronomy, University of Maryland , College Park, MD 20742 , USA
13. Caltech Optical Observatories, California Institute of Technology , Pasadena, CA 91125 , USA
14. The Oskar Klein Centre, Department of Astronomy, Stockholm University , AlbaNova, SE-10691, Stockholm , Sweden
15. Jet Propulsion Laboratory, California Institute of Technology , 4800 Oak Grove Drive, Mail Stop 169-221, Pasadena, CA 91109 , USA
16. DIRAC Institute, Department of Astronomy, University of Washington , 3910 15th Avenue NE, Seattle, WA 98195 , USA
17. IPAC, California Institute of Technology , 1200 E. California Blvd, Pasadena, CA 91125 , USA