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.
- GRB180806A: confirmation of the X-ray afterglow
- GRB 180806A: AstroSat CZTI detection
- Konus-Wind observation of GRB 180806A
- GRB 180806A: NOT optical observations
- GRB 180806A: Swift-XRT afterglow detection
- GRB 180806A/180806.98: RATIR Optical Observations of MASTER OT J004613.05+242014.1
- GRB 180806A: Fermi GBM detection
- GRB 180806A/180806.94: Refined COATLI Photometry of MASTER OT J004613.05+242014.1
- GRB 180806A: Swift ToO observations