GCN Circulars
The GCN system has the capability to receive and distribute timely information on GRBs called GCN Circulars. Users e-mail their reports to a central location and then those reports will be automatically sent to an e-mail distribution list. This list of Circular recipients is completely separate from the list of Notice recipients. The GCN Observation Report Circulars allow the GRB follow-up community to make optimum use of limited resources, such as labor and telescope time, by communicating what has already been done or will soon be done.
Read more about this topic: Gamma-ray Burst Coordinates Network