| Institution: | Astronomy Centre, Univerity of Sussex, Falmer, Brighton BN1 9QH,;Columbia Astrophysics Laboratory, Columbia University, 538 West 120th Street, New York, NY 10027, USA,;Goddard Space Flight Center, Greenbelt, MD 20771, USA,;School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS,;Department of Physics, Keele University, Keele ST5 5BG,;Astronomical Institute 'Anton Pannekoek' and Center for High Energy Astrophysics, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands |
