The Gamma Arigulon system was a star system.
The starship LaSalle reported radiation anomalies in the star system in 2367. The USS Enterprise-D was dispatched to investigate but initially detected no irregularities in the primary's radiant energy. As the Enterprise prepared to launch two Class-1 probes to further investigate the report, a Klingon Vor'cha-class attack cruiser carrying Ambassador K'Ehleyr decloaked on an urgent mission, canceling further investigation of the radiation anomalies. (TNG: "Reunion")