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.
- GRB 060728: Upper limits of the X-ray emission
- GRB 050911: LCO limits on a variable source
- Swift is in normal operation
- GRB 050911, optical content of Swift/XRT error box
- GRB 050911: LCO observations
- GRB 050911, optical observations
- GRB 050911: Swift-BAT refined analysis
- Later Swift-BAT triggers 154632 and 154633 RETRACTION
- GRB 050911: z~0.16 cluster in the field