We present an efficient and effective automatic method for determining the research focus of scientific communities found in co-authorship networks. It utilizes bibliographic data from a database to form the network, followed by fastgreedy community detection to identify communities within large connected components of the network. Text analysis techniques are used to identify community-specific significant terms which represent the topic of the community. In order to greatly reduce computation time, the `Topics' field of each publication in the network is analyzed rather than its entire text. Using this text analysis approach requires a certain level of statistical confidence,therefore analyzing very small communities is not effective with this technique. We find a minimum community size threshold of 8 coauthored papers; below this value, the community's topic cannot be reliably identified with this method. Additionally, we consider the implications this study has regarding factors involved in the formation of scientific communities in co-authorship networks.