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.
- Konus-Wind detection of GRB 220107B
- Confirmation of the X-ray afterglow of GRB 220107B
- GRB 220107B: MITSuME Akeno optical upper limits
- GRB 220107B: Nanshan/NEXT optical upper limits and host galaxy candidate
- GRB 220107B: Fermi GBM observations
- GRB 220107B: AstroSat CZTI detection
- GRB 220107B: Swift-XRT afterglow detection
- GRB 220107B: Fermi-LAT detection
- GRB 220107B: Tiled Swift observations