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 130603A: AAO optical observations
- GRB 130603A: MITSuME Akeno Optical observation
- GRB 130603A: SON optical observations
- GRB 130603A: Swift-XRT refined Analysis
- Swift/UVOT observations of GRB130603A
- GRB 130603A: Enhanced Swift-XRT position
- GRB 130603A: Swift-BAT refined analysis
- GRB 130603A: MITSuME Okayama Optical Observation
- GRB 130603A: Swift-XRT observations
- GRB 130603A: Swift-XRT and Swift-UVOT detections
- GRB 130603A: Swift detection of a burst