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 081025: Swift-XRT further analysis
- GRB 081025: Fermi GBM observation
- GRB 081025: Suzaku WAM observation of the prompt emission
- GRB 081025: TLS upper limits
- GRB081025: RTT150 optical observations
- GRB 081025 BAT refined analysis
- Swift UVOT observations of GRB081025
- Konus-Wind observation of GRB 081025
- GRB 081025: Swift-XRT position
- GRB 081025: Burst detection from Swift-BAT slew data