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The Rossi X-Ray Timing Explorer was launched in December 1996. It carries
three telescopes. The All Sky Monitor (ASM) provides continuous monitoring
of the X-ray sky in the 2-10 keV band. The observatory has been designed
to slew quickly and bring its other two telescopes to bear on targets of
opportunity. The ASM
also continuously monitors the intensities of bright sources and can be
used to ensure that an observation takes place when the target is in the
appropriate intensity state.
Damian Audley
1998-09-04