  The Arizona-NOAO Temporal Analysis and Response to Events System (ANTARES) is
a joint effort of NOAO and the Department of Computer Science at the University
of Arizona to build prototype software to process alerts from time-domain
surveys, especially LSST, to identify those alerts that must be followed up
immediately. Value is added by annotating incoming alerts with existing
information from previous surveys and compilations across the electromagnetic
spectrum and from the history of past alerts. Comparison against a knowledge
repository of properties and features of known or predicted kinds of variable
phenomena is used for categorization. The architecture and algorithms being
employed are described.
