1. Department of Astronomy & Astrophysics, 525 Davey Lab, The Pennsylvania State University, University Park, PA 16802, USA
2. Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA 16802, USA
3. Department of Physics, 104 Davey Lab, The Pennsylvania State University, University Park, PA 16802, USA
4. Department of Astronomy, C319, University of Washington, Seattle, WA 98195-0002, USA
5. Department of Physics & Astronomy, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada
6. Department of Astronomy and Space Sciences, Erciyes University, Kayseri 38039, Turkey
7. Astronomy and Space Sciences Observatory and Research Centre, Erciyes University, Kayseri 38030, Turkey
8. School of Astronomy and Space Science, Nanjing University, Nanjing, Jiangsu 210093, China
9. Department of Physics & Astronomy, University of Wyoming, 1000 E. University, Dept. 3905, Laramie, WY 82071, USA
10. Department of Physics & Astronomy, Humboldt State University, 1 Harpst Street, Arcata, CA 95521, USA
11. Department of Physics, McGill University, 3550 Rue University, Montreal, QC H3A 2T8, Canada