Dolores Beasley
Headquarters, Washington, DC                      March 14, 2000
(Phone: 202/358-1753)

RELEASE:  00-39


     NASA has selected the Gamma-Ray Burst Monitor (GBM) to be 
flown on the Gamma Ray Large Area Space Telescope (GLAST) mission, 
planned for launch in 2005.  This instrument will complement the 
primary instrument, the GLAST Large Area Telescope Flight 
Investigation, selected Feb. 28, 2000.

     GLAST will explore the most energetic and violent events in a 
quest for the ultimate sources of energy in the Universe.  Objects 
explored will include distant galaxies fueled by super massive 
black holes at their center, neutron stars and individual black 
holes that are the remnants of stars that have ended their life 
with an explosion (supernova), and many other stars at the 
extremes of mass and energy. 

     The GLAST mission also will explore the very high-energy 
component of gamma-ray bursts, which are one of the greatest 
mysteries of astrophysics.  The Gamma-Ray Burst Monitor, in 
conjunction with the primary telescope, will provide the broadest 
energy coverage ever available on a single spacecraft for gamma-
ray burst studies.  Based on the results of previous missions, 
this energy coverage will provide crucial information for 
determining the nature of these illusive objects.

     The Principal Investigator is Dr. Charles Meegan of NASA's 
Marshall Space Flight Center, Huntsville, AL.  This investigation 
is a collaborative international effort involving a major 
contribution from the Max Planck Institute for Extraterrestrial 
Physics (MPE) in Germany.  Co-Investigators include scientists 
from MPE and the University of Alabama in Huntsville.

     Goddard Space Flight Center, Greenbelt, MD, will manage the 
GLAST mission for NASA's Office of Space Science in Washington, 
DC.  NASA's cost to develop the GLAST mission is approximately 
$200 million, which includes approximately $5 million for the 
secondary instrument.