NASA Goddard GLAST page: http://glast.gsfc.nasa.gov/
NASA Goddard gamma ray page: http://imagine.gsfc.nasa.gov/docs/science/know_l1/bursts.html
NASA Goddard dark matter page: http://imagine.gsfc.nasa.gov/docs/science/know_l1/dark_matter.html
“Gammy” ray?
Some interesting imagery there.