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 090926B: Skynet/PROMPT Observations
- GRB 090926B: Fermi GBM detection
- GRB090926B: Swift/UVOT Upper Limits
- GRB 090926B: VLT spectroscopy
- GRB 090926B: optical object in error circle
- GRB 090926B: MAXI GSC detection
- GRB 090926B: NOT optical observation
- GRB 090926B: Swift XRT refined analysis
- GRB 090926B: Swift-BAT refined analysis
- GRB 090926B: Swift detection of a burst