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"13 results found.
- GRB 201024A: 1.3m DFOT optical observations
- GRB 201024A: MITSuME Akeno optical upper limits
- GRB 201024A: Swift-BAT refined analysis
- GRB201024A: rebrightening after initial steep decline
- GRB 201024A: Swift-XRT refined Analysis
- GRB 201024A: Swift/UVOT Detection
- GRB 201024A: VIRT optical observations
- GRB 201024A: Enhanced Swift-XRT position
- GRB 201024A: FRAM-ORM afterglow detection
- GRB 201024A: Redshift from GTC/OSIRIS
- GRB 201024A: BOOTES-2/TELMA early optical observation and 1.5m OSN follow-up
- GRB 201024A: MASTER correction to GCN 28760
- GRB 201024A: Swift detection of a burst with an optical afterglow