The international ROSAT project has also produced a number of useful documents, including individual calibration memos and the ROSAT Users Handbook. These are available from the US anonymous ftp site legacy.gsfc.nasa.gov. More specific references are provided in later section where appropriate.
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. Information about ASTERIX is available on Birmingham University's ASTERIX home page.
http://ledas-www.star.le.ac.uk/Forum/rosat-news
http://heasarc.gsfc.nasa.gov/docs/rosat/rosgof.html
http://www.sr.bham.ac.uk/asterix