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 150204A: GROND observations
- GRB 150204A: Swift/XRT afterglow confirmation
- GRB 150204A: LCOGT-Sutherland and Siding Springs observations
- GRB 150204A: Swift/UVOT Upper Limits
- GRB 150204A: Swift-XRT observations
- GRB 150204A: Fermi GBM detection
- GRB 150204A: Swift ToO observations
- GRB 150204A BAT refined analysis
- GRB 150204A found in ground analysis of Swift-BAT data
- Swift Trigger 629693: probably not real