  The era of multi-messenger astrophysics has arrived, leading to key new
discoveries and revealing a need for coordination, collaboration, and
communication between world-wide communities using ground and space-based
facilities. To fill these critical needs, NASA's Goddard Space Flight Center
and Marshall Space Flight Center are jointly proposing to establish a virtual
Multi-Messenger Astrophysics Science Support Center that focuses entirely on
community-directed services. In this article, we describe the baseline plan for
the virtual Support Center which will position the community and NASA as an
Agency to extract maximum science from multi-messenger events, leading to new
breakthroughs and fostering increased coordination and collaboration.
