National Aeronautics and
Space Administration
NASA logo


NASA’s Next Generation Time-Domain and Multimessenger Alert System

A service of the Astrophysics Science Division at NASA’s Goddard Space Flight Center

We invite you to join one of our three public Zoom webinars for an overview and tutorial on the new GCN.

Important: Follow one of these links to register in advance and receive the actual Zoom meeting link.

August 1, 2022 12:00-13:00 UTC (best for Atlantic)

August 1, 2022 20:00-21:00 UTC (best for Pacific)

August 2, 2022 04:00-05:00 UTC (best for Asia and Oceania):

Realtime Alerts Born of Necessity

CGRO with BATSE Instrument

GCN Enabled Seminal Breakthroughs in Astrophysics

GCN Classic Logo

There are two kinds of GCN data products:

The Changing Scientific Landscape

Neutron Star Merger

The Changing Technological Landscape

Vera C. Rubin Observatory

the new GCN

GCN streaming methods

Why switch to the new GCN?

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 the 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
Screen shot of new web site

Streaming GCN
Notices in Python

Screen shot
Screen shot
Screen shot
Screen shot
Screen shot
Screen shot
Screen shot
Screen shot