1. South African Astronomical Observatory, PO Box 9, 7935 Observatory, South Africa
2. epartment of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
3. INAF–Osservatorio di Padova, vicolo dell’ Osservatorio 5, I-35122 Padova, Italy
4. Department of Astronomy, University of Wisconsin, 475 N. Charter Str., Madison, WI 53704, USA
5. X-ray and Observational Astronomy Group, Department of Physics & Astronomy, University of Leicester, LE1 7RH, UK
6. XMM–Newton Observatory SOC, European Space Astronomy Centre, Camino Bajo del Castillo s/n, Urb. Villafranca del Castillo, E-28692 Villanueva de la Cañada, Madrid, Spain
7. University College London, Mullard Space Science Laboratory, Holmbury St. Mary, Dorking RH5 6NT, UK
8. Department of Physics and Astronomy, Stony Brook University, Stony Brook NY 11794-3800, USA
9. Center for Data Intensive and Time Domain Astronomy, Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
10. Astrophysics Research Institute, Liverpool John Moores University, IC2 Liverpool Science Park, Liverpool, L3 5RF, UK
11. Advanced Technologies Research Institute, Slovak University of Technology in Bratislava, Paulinska 16, 91724 Trnava, Slovak Republic
12. Southern African Large Telescope Foundation, PO Box 9, Observatory 7935, South Africa
13. Special Astrophysical Observatory of RAS, Nizhnij Arkhyz, Karachai-Circassia 369167, Russia
14. American Association of Variable Star Observers, 5 Inverness Way, Hillsborough, CA 94010
15. Via Pietro Pomponazzi, 33, I-35124 Padova, Italy
16. Department of Astronomy, San Diego State University, San Diego, CA 92182, USA
17. School of Earth and Space Exploration, Arizona State University Tempe, AZ 85287-1404, USA
18. Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis, MN 55455, USA