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"9 results found.
- GRB 120703A: SMARTS optical/IR observations
- GRB 120703A: Swift/UVOT Detection
- GRB 120703A: Fermi GBM detection
- GRB 120703A: Swift-XRT refined Analysis
- GRB 120703A: Enhanced Swift-XRT position
- GRB 120703A: Swift-BAT refined analysis
- Konus-Wind observation of GRB 120703A
- GRB 120703A: NOT optical observation
- GRB 120703A: Swift detection of a bright burst with an optical afterglow