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"10 results found.
- GRB 200907B: Swift/UVOT Upper Limits
- GRB 200907B: Swift-BAT refined analysis
- GRB 200907B: AstroSat CZTI detection
- GRB 200907B: Swift-XRT refined Analysis
- GRB 200907B: MITSuME Okayama optical upper limits
- Swift GRB 200907B: Global MASTER-Net observations report
- GRB 200907B: Enhanced Swift-XRT position
- Correction to GCN 28387: GRB 200907B GROWTH-India optical upper limit
- GRB 200907B: Prompt enhanced Swift-XRT position
- GRB 200907B: Swift detection of a short burst