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"11 results found.
- GRB 111005A: ATCA 18 GHz decay
- GRB 111005A: ATCA 18 GHz detection
- GRB 111005A: ATCA radio upper limit
- GRB 111005A : miniTAO/ANIR NIR observations
- GRB 111005A: EVLA Observations
- GRB 111005A: VLT optical observations
- GRB 111005A: GROND NIR observations
- GRB 111005A: VLT IR observations
- GRB 111005A: Swift-BAT refined analysis
- GRB 111005A: bright galaxy in error circle
- GRB 111005A: Swift detection of a burst