Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
Due to the lapse in federal government funding, NASA is not updating this website. See the Operations FAQ for GCN impacts.
New! Super-Kamiokande JSON Notices and Schema v4.5.0. See news and announcements

Notices Archive

GCN Classic Archives

The GCN Classic Notices archive pages remain actively populated with all GCN Classic Notice types in legacy formats.

GCN Viewer

The GCN Viewer automatically ingests and parses GCN Circulars, sorting them by astronomical event, and associates them with their GCN Notices.

Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

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

Looking for U.S. government information and services? Visit USA.gov