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.
- GRB 251111A: SVOM/ECLAIRs refined analysis
- GRB 251111A: Swift-XRT afterglow detection
- GRB 251111A: SVOM/VT optical observations with X-band data
- GRB 251111A: Swift-XRT observations
- GRB 251111A: EP-FXT counterpart detection
- GRB 251111A: SVOM/VT optical observations with VHF data
- GRB 251111A: KAIT optical upper limit
- GRB 251111A: LCO optical observation
- GRB 251111A: SVOM/COLIBRÍ (FM-GFT) optical counterpart detection
- GRB 251111A: SVOM detection of a soft burst