The new GCN: Multimessenger astronomy alerts delivered over Kafka
GCN distributes alerts between space- and ground-based observatories, physics experiments, and thousands of astronomers around the world.Start streaming GCN Notices
The General Coordinates Network (GCN) is a public collaboration platform run by NASA for the astronomy research community to share alerts and rapid communications about high-energy, multimessenger, and transient phenomena. For more information, see What is GCN?
There are three ways to stream GCN Notices in real time:
Three formats, three protocols.
Three formats, one protocol.
One format, one protocol.
|GCN Classic||GCN Classic over Kafka|
|Self-service||NO. Users need to contact administrator in order to make account and subscription changes||YES. Manage your own account and subscription settings through this web site|
|Open standards||NO. Notices are sent using three custom protocols||YES. Notices are sent using one standard protocol, Apache Kafka|
|Open source||NO. Custom software needed to receive notices||YES. Receive notices using open-source software|
|Highly available||NO. Notices are broadcast by a single server||YES. Notices are broadcast by a cluster of highly-available Kafka brokers in the cloud|
|Secure||NO. Notices are sent as plaintext||YES. Notices are protected with SSL/TLS|
The GCN Viewer is an interactive, searchable, filterable index of all GCN Notices and Circulars, updated in real time. In the near future, it will be integrated with this web site.
See the GCN Road Map for more features that are coming soon to GCN.