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"10 results found.
- GRB 130701A: MITSuME Akeno Optical observation
- GRB 130701A: Swift-XRT refined Analysis
- GRB 130701A: P60 Observations
- GRB 130701A, Swift-BAT refined analysis
- Konus-Wind observation of GRB 130701A
- GRB 130701A: Swift/UVOT Detection
- GRB 130701A: VLT/X-shooter redshift
- GRB 130701A: Enhanced Swift-XRT position
- GRB 130701A: optical afterglow from the NOT
- GRB 130701A: Swift detection of a burst