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.
- GRB190305A: MASTER Global Robotic Net optical observation
- GRB 190305A: Swift-XRT afterglow detection
- GRB 190305A: CALET Gamma-Ray Burst Monitor detection
- Konus-Wind observation of GRB 190305A
- IPN Triangulation of GRB 190305A
- GRB 190305A: Swift-XRT observations
- GRB 190305A: Insight-HXMT/HE detection
- GRB 190305A: MAXI/GSC detection
- GRB 190305A: Tiled Swift observations
- GRB 190305A: AGILE/MCAL detection of a burst