1. Cornell Center of Astrophysics and Planetary Sciences, Department of Astronomy and Carl Sagan Institute , Ithaca, NY 14850 , USA
2. Johns Hopkins Applied Physics Laboratory , Laurel, MD 20723 , USA
3. Center for Relativistic Astrophysics, School of Physics, Georgia Institute of Technology , Atlanta, GA 30332 , USA
4. Department of Physics, Astronomy, and Geosciences and Engineering Technology, Valdosta State University , Valdosta, GA 31698 , USA
5. Department of Physics and Astronomy, University of California Los Angeles , Los Angeles, CA 90095 , USA
6. Department of Astronomy and Astrophysics, University of Chicago , Chicago, IL 60637 , USA
7. Department of Physics and Astronomy, University of New Mexico , Albuquerque, NM 87106 , USA
8. Jet Propulsion Laboratory, California Institute of Technology , Pasadena, CA 91109 , USA