Monitoring the High Energy Gamma-Ray Sky with GLAST

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

The Large Area Telescope (LAT) on the Gamma-ray Large Area Space Telescope (GLAST) is a next-generation high-energy gamma-ray instrument for studying emission from astrophysical sources in the energy band from 20 MeV to >300 GeV, with supportive observations of gamma-ray bursts at lower energies by the Glast Burst Monitor (GBM). The sensitivity achieved on the entire sky after a single days observation is similar to the point source sensitivity of EGRET for the entire mission. The large effective area will allow flares from AGN to be detected at much lower flux levels and on far shorter time intervals that has previously been possible from space. The very large field of view will make it possible to monitor ˜20% of the sky at any instant, and the entire sky on timescale of a few hours. With a deadtime of <100 μs, gamma-ray burst observations will not be limited by deadtime. With these properties GLAST is particularly well suited to the study of variable and transient high energy gamma-ray phenomena such as AGN and gamma-ray bursts.

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