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"8 results found.
- GRB 240414A: GAD Observatory, La Spezia, Italy ,upper limit
- GRB 231216A: GAD Observatory, La Spezia, Italy upper limit
- GRB 231215A: GAD Observatory, La Spezia, Italy upper limit;
- Swift J1727.8-1613 (GRB 230824A): GAD Observatory La Spezia - optical observations
- GRB 230812B: GAD Observatory optical observations (upper limit)
- GRB 230812B: Iota Scorpii Observatory, La Spezia, Italy
- GRB 230805B: Iota Scorpii Observatory, La Spezia, Italy upper limit
- GRB 230723B: GAD Observatory, La Spezia, Italy upper limit