To obtain more information about satellites observing the sky in x-rays and gamma rays, you can contact the archive of the Laboratory for High Energy Astrophysics at Goddard Space Flight Center.
Some documents in that archive can be linked directly from here:
A list of space missions observing x-rays and gamma-rays from the universe can be reached here
"Exploration" home page (index)
Official GSFC Home Page .........
NASA WWW Home Page
Authors and Curators:
- David P. Stern - NASA/GSFC Code 695 (email@example.com)
- Mauricio Peredo - Raytheon STX Corporation (firstname.lastname@example.org)
Last updated March 13, 1999