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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"8 results found.
- GRB 120803A: optical upper limit
- GRB 120803A: Confirmation of the X-ray afterglow
- Erratum of subject line of GCN13570 (GRB 120803A => GRB 120803B)
- GRB 120803A: MITSuME Okayama Optical upper limits
- GRB 120803B: MITSuME Akeno Optical upper limits
- GRB 120803A: Swift-XRT Observations
- GRB 120803A: Swift-BAT refined analysis
- GRB 120803A: Swift detection of a possible burst