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GLAST BURST MONITOR

G. LAST. urst. B. onitor. M. GLAST BURST MONITOR.

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GLAST BURST MONITOR

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  1. G LAST urst B onitor M GLAST BURST MONITOR Narayana P. Bhat1, Valerie Connaughton1, Andreas von Kienlin3, Michael S. Briggs1, Charles A. Meegan2, Roland Diehl3, Gerald J. Fishman2, Jochen Greiner3, Marc Kippen4, Chryssa Kouveliotou2,5, Giselher G. Lichti3,William S. Paciesas1, Robert D. Preece1, Volker Schönfelder3 and Robert B. Wilson2. 1. The University of Alabama in Huntsville 2. NASA/Marshall Space Flight Center 3. Max-Planck-Institut für extraterrestrische Physik 4. Los Alamos National Laboratory 5. Universities Space Research Association ABSTRACT The Gamma Ray Large Area Space Telescope (GLAST) mission is a follow-up on the successful EGRET experiment onboard the CGRO. It will provide a high-sensitivity survey of the sky in high-energy g-rays, and will perform detailed observations of selected persistent and transient sources. There are two experiments onboard GLAST - a Large Area Telescope (LAT) and the GLAST Burst Monitor (GBM). The primary mission of the GBM instrument is to support the LAT in observing g-ray bursts (GRB's) by providing low-energy measurements with high time resolution and rapid burst locations over a large (> 8 sr) field of view. The GBM will complement the LAT measurements by observing GRBs in the energy range 10 keV to 30 MeV, the region of the prominent spectral turnover of GRB's. An important objective of GBM is to compute the locations of GRB sources on-board the spacecraft and quickly communicate them to the LAT and to the ground to allow rapid follow-up observations at space- and ground-based observatories. This information may be used to re-point the spacecraft towards particularly interesting burst sources that occurred outside the LAT field of view.The GBM consists of 14 uncollimated scintillation detectors coupled to phototubes to measure g-ray energies and arrival times. Two different detector types are used to obtain spectral information over a wide energy range: 12 NaI detectors (10 keV to 1 MeV), and 2 BGO detectors (150 keV to 30 MeV). The detectors are distributed around the GLAST spacecraft to provide a large unobstructed field of view. The 12 NaI detectorsare mounted with different orientations to provide directional information for use in locating GRB sources.

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