GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"9 results found.
- GRB 221024A: Mondy optical observations
- GRB 221024A: GRANDMA observations
- GRB 221024A: Swift-BAT refined analysis
- GRB 221024A: Swift/UVOT UV upper limits
- GRB 221024A: Swift-XRT refined Analysis
- GRB 221024A: GIT confirmation of the optical afterglow
- GRB 221024A: Enhanced Swift-XRT position
- GRB 221024A: D50 candidate afterglow
- GRB 221024A: Swift detection of a burst