The Gamma-ray Coordinates Network/Transient Astronomy Network (GCN/TAN), is a system for distributing astronomical alerts, largely focused on operations of and detections from high-energy satellite missions.

GCN/TAN disseminates both Notices (prompt, machine-readable alerts) and Circulars (human-readable correspondence) through a handful of delivery methods and formats.

This package implements a simple client that anonymously listens for VOEvent XML format notices over the custom TCP/IP VOEvent Transport Protocol.