1. Department of Physics and Astronomy, Center for Data Intensive and Time Domain Astronomy, Michigan State University , East Lansing, MI 48824 , USA
2. Department of Astronomy, University of Illinois at Urbana-Champaign , 1002 W. Green Street, Urbana, IL 61801 , USA
3. Sternberg Astronomical Institute, Moscow State University , Universitetskii pr. 13, 119992 Moscow , Russia
4. Department of Astronomy & Astrophysics, University of California , 1156 High St, Santa Cruz, CA 95064 , USA
5. Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218 , USA
6. South African Astronomical Observatory , P. O. Box 9, 7935 Observatory , South Africa
7. Department of Astronomy, University of Cape Town , Private Bag X3, Rondebosch 7701 , South Africa
8. Centro de Estudios de Física del Cosmos de Aragón , Plaza San Juan 1, E-44001, Teruel , Spain
9. UK Astronomy Technology Centre, Royal Observatory , Blackford Hill, Edinburgh, EH9 3HJ , UK
10. DARK, Niels Bohr Institute, University of Copenhagen , Jagtvej 128, DK-2200 Copenhagen Ø , Denmark
11. National Radio Astronomy Observatory , P. O. Box O, Socorro, NM 87801 , USA
12. Southern African Large Telescope Foundation , P. O. Box 9, Observatory 7935 , South Africa
13. Special Astrophysical Observatory , Nizhnij Arkhyz, Karachai-Circassia 369167 , Russia
14. Department of Physics and Columbia Astrophysics Laboratory, Columbia University , New York, NY 10027 , USA
15. Center for Computational Astrophysics, Flatiron Institute , 162 5th Avenue, New York, NY 10010 , USA
16. Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences , Bartycka 18, PL 00-716 Warsaw , Poland
17. INAF − Osservatorio Astronomico di Trieste , Via G. B. Tiepolo 11, I-34143 Trieste TS , Italy
18. Institute of Fundamental Physics of the Universe , Via Beirut, 2, I-34151 Trieste TS , Italy
19. CRESST and X-ray Astrophysics Laboratory, NASA/GSFC , Greenbelt, MD 20771 , USA
20. Department of Physics, University of Maryland , Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250 , USA
21. INAF Astronomical Observatory of Padova , I-36012 Asiago (VI) , Italy
22. INAF – Osservatorio di Padova , vicolo dell’Osservatorio 5, I-35122 Padova , Italy
23. Department of Astronomy, University of Wisconsin , 475 N. Charter St., Madison, WI 53704 , USA
24. Department of Physics, Center for Materials Research, Norfolk State University , Norfolk, VA 23504 , USA
25. Institute for Astronomy, University of Hawai’i , 2680 Woodlawn Drive, Honolulu, HI 96822 , USA
26. Department of Astronomy and Theoretical Astrophysics Center, University of California , Berkeley, CA 94720 , USA
27. Columbia Astrophysics Laboratory and Department of Physics, Columbia University , New York, NY 10027 , USA
28. Department of Physics & Astronomy, Stony Brook University , Stony Brook, NY 11794-3800 , USA