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 090509: Fermi GBM observation
- GRB 090509 - Zadko Telescope observations
- GRB 090509, further Swift-BAT refined analysis
- GRB 090509: Swift-BAT refined analysis
- GRB 090509, SMARTS optical/IR afterglow observations
- GRB 090509: GROND further analysis and redshift limit
- GRB 090509: REM NIR afterglow
- GRB 090509: GROND afterglow candidate
- GRB 090509: Swift detection of a burst