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"8 results found.
- GRB 110420B: Swift/UVOT Upper Limits
- GRB 110420B: Swift-XRT afterglow candidate retraction
- GRB 110420B: Fermi GBM observation
- GRB 110420B: Spectral lag indicates short hard burst
- GRB 110420B, GROND observations
- GRB 110420B: Swift-XRT afterglow candidate
- GRB 110420B: Swift-BAT refined analysis
- GRB 110420B: Swift detection of a short hard burst