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"12 results found.
- GRB 081128: afterglow observations
- GRB 081128: optical observation in CrAO
- GRB 081128: Optical afterglow observations
- GRB 081128: optical observation
- GRB081128: Swift/UVOT Upper Limits
- GRB 081128: Swift-XRT refined analysis
- GRB 081128: Liverpool Telescope afterglow confirmation
- GRB081128: optical observations
- GRB 081128: Swift-BAT refined analysis
- GRB 081128: Enhanced Swift-XRT position
- GRB 081128: Optical observation of xinglong TNT
- GRB 081128: Swift detection of a burst