Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

New GCN Circular

The subject line must contain (and should start with) the name of the transient, which must start with one of the
Body text. If this is your first Circular, please review the style guide. References to Circulars, DOIs, arXiv preprints, and transients are automatically shown as links; see
Looking for U.S. government information and services? Visit USA.gov