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"10 results found.
- GRB 231205B: NUTTelA-TAO / BSTI Early Optical Limits
- GRB 231111A: Optical follow-up observations at Terskol, AbAO, Maidanak, Mondy, Assy
- GRB 231111A NUTTelA-TAO / BSTI Early Measurements
- GRB 230812B: Assy optical observations, possible SN rise
- GRB 230816A: TShAO and Assy optical observations
- GRB 230506C: NUTTelA-TAO / BSTI Early Optical Limits
- GRB 230328B NUTTelA-TAO / BSTI Early Measurements
- GRB 230228A: NUTTelA-TAO / BSTI Optical Limits
- ZTF23aaarlti/AT2023avj: Assy continued optical observations
- AT2023avj ZTF Candidate: Assy optical observations