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"12 results found.
- GRB 160624A: MITSuME Ishigakijima upper limits
- GRB 151029A: FRAM optical afterglow detection
- Correction to the Trigger Time for Swift GRB 151029A
- GRB 151029A: MITSuME Ishigakijima upper limits
- GRB 151029A: Swift-XRT refined Analysis
- GRB 151029A: Swift/UVOT Detection
- GRB 151029A: LCOGT-FTS afterglow observations
- GRB 151029A: Swift-BAT refined analysis
- GRB 151029A: Enhanced Swift-XRT position
- GRB 151029A VLT/X-shooter redshift
- GRB 151029A: GROND afterglow observations
- GRB 151029A: Swift detection of a burst with an optical counterpart