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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"10 results found.
- KAIT Optical Upper Limits for GRB 120422A, 120724A, 120803B, 120911A, and 120923A
- GRB 120724A: optical observation in Maidanak observatory
- GRB 120724A: JCMT SCUBA-2 sub-mm observation
- GRB 120724A, Swift-BAT refined analysis
- GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
- GRB 120724A: Enhanced Swift-XRT position
- GRB 120724A: Swift-XRT refined Analysis
- GRB 120724A: Gemini-N tentative redshift
- GRB 120724A: FTN optical afterglow candidate
- GRB 120724A: Swift detection of a burst