News items, including the national ROSAT newsletters can be accessed via the Leicester ROSAT home page and the HEASARC ROSAT guest observer facility on the World Wide Web.
http://www.star.le.ac.uk/Forum/rosat-news and
http://heasarc.gsfc.nasa.gov/docs/rosat/rosgof.html
Documentation on ASTERIX can be found at:
http://www.sr.bham.ac.uk/asterix-docs/