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"13 results found.
- GRB 180703A: VLT/MUSE host galaxy redshift measurement
- GRB 180703A: optical afterglow confirmation
- GRB 180703A: Swift-XRT afterglow detection
- Konus-Wind observation of GRB 180703A
- GRB 180703A: MASTER optical observation
- IPN Triangulation of GRB 180703A
- GRB 180703A: AstroSat CZTI detection
- GRB 180703A: Swift/UVOT Upper Limits
- GRB 180703A: Fermi GBM detection
- GRB 180703A: LCO Sutherland possible optical candidate
- GRB 180703A: Swift-XRT observations
- GRB 180703A: Fermi-LAT detection
- GRB 180703A: Tiled Swift observations