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.
- Correction to GCN 18521 "GRB140209A: Swift/UVOT observations"
- GRB 140209A: Swift-XRT observations
- Konus-Wind observation of GRB 140209A
- GRB 140209A: Early RAPTOR Optical Detection
- GRB 140209A: Swift-BAT Spectral lag analysis
- GRB 140209A, Swift-BAT refined analysis
- GRB 140209A: Fermi GBM observation
- GRB 140209A: optical observations
- GRB 140209A: P60 optical afterglow detection
- GRB 140209A: Swift detection of a burst