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The Large Area Telescope on the Fermi gamma-ray Space Telescope (FGST,ex-GLAST) provides unprecedented sensitivity for all-sky monitoring ofgamma-ray activity. It is an adequate telescope to detect transient sources,since the observatory scans the entire sky every three hours and allows ageneral search for flaring activity on daily timescale. This search isconducted automatically as part of the ground processing of the data and allowsa fast response -less than a day- to transient events. Follow-up observationsin X-rays, optical, and radio are then performed to attempt to identify theorigin of the emission and probe the possible existence of new transientgamma-ray sources in the Galaxy. Since its launch on 11th June 2008, Fermi-LAThas detected nearly 1500 gamma-ray sources, nearly half of them beingextragalactic. After a brief census of detected celestial objects, we reporthere on the LAT results focusing on Galactic transient binary systems. TheFermi-LAT has detected 2 gamma-ray binaries, a microquasar and an unexpectednew type of gamma-ray source: a symbiotic nova.

Fermi-gst: A new view of the gamma-ray sky