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"10 results found.
- GRB 210104A: Late-time CAHA 2.2m detection
- GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
- GRB 120714B: GROND/FORS2 detection of a supernova
- GRB 120714B: Swift/UVOT Detection
- GRB 120714B: Swift-XRT refined Analysis
- GRB 120714B: Swift-BAT refined analysis
- GRB 120714B: GROND confirmation of fading afterglow
- GRB 120714B: Redshift from VLT/X-shooter
- GRB 120714B: Position Correction and Candidate Optical Afterglow
- GRB 120714B: Swift detection of a burst