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.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"11 results found.
- GRB 121117A: Terskol obseravtions
- GRB 121117A: Optical observations
- GRB 121117A: optical upper limit
- GRB 121117A: GROND confirmation of the UVOT afterglow candidate
- GRB 121117A: Swift/UVOT Observations
- GRB 121117A: Swift-XRT refined Analysis
- GRB 121117A: MASTER prompt optical limit
- GRB 121117A, Swift-BAT refined analysis
- GRB 121117A: ROTSE-III Optical Limits
- GRB 121117A: BOOTES-3 early optical upper limit
- GRB 121117A: Swift detection of a burst