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 100302A: Ondrejov 65cm limit
- GRB 100302A: Swift/UVOT Upper Limits
- GRB 100302A: Swift-XRT refined analysis
- GRB 100302A: Gemini-North redshift
- GRB 100302A: Gemini-N OT confirmation
- GRB 100302A: Optical observations at Crni Vrh
- GRB 100302A: MASTER-Net optical alert observations
- GRB 100302A, Swift-BAT refined analysis
- GRB 100302A: Enhanced Swift-XRT position
- GRB 100302A: Skynet/DAO Observations
- GRB 100302A: Swift detection of a burst