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 161022A: 15 GHz upper limits from AMI
- GRB 161022A: Swift-BAT refined analysis
- GRB 161022A: RATIR Optical and NIR Observations
- GRB 161022A: Swift/UVOT Upper Limits
- GRB 161022A: Fermi GBM observation
- GRB 161022A: NOT optical observations
- GRB 161022A: Enhanced Swift-XRT position
- GRB 161022A: Swift-XRT refined Analysis
- GRB 161022A: LT observations
- GRB 161022A: TAROT Calern observatory optical observations
- GRB 161022A: Prompt enhanced Swift-XRT position
- GRB 161022A: Swift detection of a burst