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"12 results found.
- GRB 161007A: 15 GHz upper limits from AMI
- GRB 161007A: NOT optical observations
- GRB 161007A: AbAO optical observations
- GRB 161007A: Mondy optical observations
- GRB 161007A: Swift-BAT refined analysis
- GRB 161007A: Swift/UVOT Upper Limits
- GRB 161007A: Swift-XRT refined Analysis
- GRB 161007A: GTC observations
- GRB 161007A: Enhanced Swift-XRT position
- GRB 161007A: Prompt enhanced Swift-XRT position
- GRB 161007A: MASTER-net early optical observations
- GRB 161007A: Swift detection of a burst