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 190719C: VLT/X-shooter spectroscopic redshift of the host galaxy
- GRB 190719C: optical afterglow confirmation
- GRB 190719C: Fermi GBM detection
- GRB 190719C: Swift-BAT refined analysis
- GRB 190719C: Swift/UVOT Upper Limits
- GRB 190719C: Swift-XRT light-curve fit
- GRB 190719C: Swift-XRT refined Analysis
- GRB 190719C: NOT candidate optical afterglow and host
- GRB 190719C: Swift detection of a burst
- GRB 190719C: Fermi GBM Final Real-time Localization