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"10 results found.
- GRB 090929B: Suzaku WAM observation of the prompt emission
- GRB 090929B, Swift-BAT refined analysis
- Konus-Wind observation of GRB 090929B
- GRB 090929B: Swift-XRT refined analysis
- GRB 090929B: Gemini-N upper limits
- GRB 090929B: Skynet/DSO Observations
- GRB 090929B: Swift/UVOT Observations
- GRB 090929B: RAPTOR Discovery of Optical Counterpart
- Correction: GRB 090929B: Enhanced Swift-XRT position
- GRB 090929B: Swift detection of a burst