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 170810A: VLA Detection
- GRB 170810A: AbAO optical upper limit
- GRB 170810A: Swift-BAT refined analysis
- GRB 170810A: Swift-XRT refined Analysis
- GRB 170810A: Swift/UVOT Detection
- GRB 170810A: Fermi GBM observation
- GRB 170810A: Fermi-LAT detection
- GRB 170810A: Enhanced Swift-XRT position
- GRB 170810A: Swift detection of a burst with a bright optical counterpart
- GRB 170810A: MASTER-NET very bright OT detection