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 131122A: Swift-XRT Further Observation
- GRB 131122A: Swift/UVOT Upper Limits
- GRB 131122A: Upper limit from NOT imaging
- GRB 131122A: Swift-XRT observations
- GRB 131122A: i-band observations from NOT
- GRB 131122A: Nanshan optical upper limit
- GRB 131122A: a long GRB detected with INTEGRAL
- GRB 131122A (INTEGRAL trigger N6392): MASTER-NET optical observation