GLAST is designed to study the most energetic processes in the universe, such as the jets of superheated matter ejected from black holes and powerful explosions known as gamma-ray bursts. You can read about the instruments and their objectives here.
rocketed skyward from Florida at 12:05 p.m. EDT on the 11th. Now it's safely orbiting Earth at an altitude of 350 miles (560 km). The mission's engineers and scientists will give it a thorough checkout over the next two months, and the first observations from its instruments should come in about three weeks.