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"911 results found.
- GRB 071031: Swift/UVOT detection of afterglow
- GRB070318: Swift UVOT continuing observations
- GRB051109B: Late-time Radio Observations
- GRB 060502B: Swift/UVOT upper limits
- Konus-Wind observation of GRB 051022
- GRB 030329: Additional Mt. Laguna Optical Observations
- GRB 030329: Correction to GCN 2056
- GRB 030329: optical observations
- GRB000326 Optical Observations
- GRB000326, Further VLA observations
- GRB 000326: Optical Observations