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 050603: Analysis of UVOT data
- GRB 050412: Swift XRT Position
- Swift-UVOT Optical Counterpart Candidate to XRF 050406
- GRB 050406: Magellan optical observations
- GRB 050406: early Swift XRT analysis results
- GRB 050406 BAT refined analysis
- GRB 050406: Early observations with Swift-UVOT
- GRB 050406: Swift XRT Position
- Swift-BAT detection of GRB 050406