Institution: | University of Birmingham, School of Physics and Astronomy, Birmingham, B15 2TT;Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Cracow, Poland;Laboratory for High Energy Astrophysics, Code 660.1, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA;Office of Space Science, Astronomy and Physics Division, Code SZ, NASA Headquarters, Washington, DC 20546-0001, USA |