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.
- Four radio sources in Swift-XRT error box of GRB 070724
- GRB 070724: optical observations
- GRB 070724: P60 and Gemini Observations
- GRB 070724: IR observations
- GRB 070724: Closer association with DSS source
- GRB 070724: Swift-XRT Team refined analysis
- GRB 070724: Pre-Imaging Shows a Source in the XRT Error Circle
- GRB 070724, Swift-BAT refined analysis of a short burst
- GRB 070724: Swift detection of a burst