Multimessenger astronomy
  In this paper we provide a short overview of the scope and strong future
potential of a multi-messenger approach to gravitational-wave astronomy, that
seeks to optimally combine gravtitational wave and electromagnetic
observations. We highlight the importance of a multi-messenger approach for
detecting gravitational wave sources, and also describe some ways in which
joint gravitational wave and electromagnetic observations can improve the
estimation of source parameters and better inform our understanding of the
sources themselves -- thus enhancing their potential as probes of astrophysics
and cosmology.
