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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"14 results found.
- GRB 090726 R band observations
- GRB 090726: Skynet/GORT Observations
- GRB 090726: optical observation
- GRB 090726: GRT Optical Observation
- GRB090726: Swift/UVOT observations
- GRB 090726, Swift-BAT refined analysis
- GRB 090726: Afterglow candidate photometryfrom Crni Vrh
- GRB 090726: D50 optical observations
- GRB 090726: Swift-XRT Team refined analysis
- GRB 090726: Enhanced Swift-XRT position
- GRB 090726: optical transient candidate
- GRB 090726: Swift/UVOT Finding Chart Observation
- GRB 090726: Swift-XRT position of probable counterpart
- GRB 090726: Swift detection of a burst