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 161217A: 15 GHz upper limits from AMI
- GRB 161217A: TAROT Calern observatory optical observations
- GRB 161217A: MITSuME Okayama upper limits
- GRB 161217A: Swift-BAT refined analysis
- GRB 161217A: Swift/UVOT Upper Limits
- GRB 161217A: Swift-XRT refined Analysis
- GRB 161217A: Enhanced Swift-XRT position
- GRB 161217A: Swift detection of a burst