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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"8 results found.
- GRB 181003A: RATIR Optical and NIR Observations
- GRB 181003A: Swift-BAT refined analysis
- GRB 181003A: Swift-XRT afterglow detection
- GRB 181003A: Swift/UVOT Upper Limits
- GRB 181003A: LCO Cerro Tololo observations
- GRB 181003A: MASTER optical observation
- GRB 181003A: Swift-XRT observations
- GRB 181003A: Swift detection of a burst