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"9 results found.
- Radio observation of GRB 080523 with ATCA
- GRB 080623: Suzaku WAM observation of the prompt emission
- GRB 080523: afterglow confirmation and redshift constraints
- GRB 080523: Swift-XRT refined analysis
- GRB 080523, Swift-BAT refined analysis
- GRB 080523: VLT optical observations
- Swift/UVOT observations of GRB 080523
- GRB 080523: Enhanced Swift-XRT position
- GRB 080523: Swift detection of a burst