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"14 results found.
- GRB 180809B: AstroSat CZTI detection
- GRB 180809B: ePESSTO NTT NIR observations
- Konus-Wind observation of GRB 180809B
- GRB 180809B: Swift-XRT refined Analysis
- GRB 180809B: CrAO optical observations
- GRB 180809B, Swift-BAT refined analysis
- GRB 180809B: Swift/UVOT Detection
- GRB 180809B: CALET Gamma-Ray Burst Monitor detection
- GRB 180809B: VLT optical upper limits
- GRB180809B: MASTER Triple Independent Automatic OT Detection
- GRB 180809B: LCO Sutherland observations
- GRB 180809B: GROND Detection of the NIR Afterglow
- GRB 180809B: RATIR Optical Observations and Confirmation of Rapid Fading
- GRB 180809B: Swift detection of a burst with an optical afterglow