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 210217A: 3.6m DOT optical observations
- GRB 210217A: Mondy optical observations
- GRB 210217A: Swift/UVOT Detection
- GRB 210217A: 1.3m DFOT optical detection
- GRB 210217A: Swift-XRT refined Analysis
- Fermi GBM Sub-Threshold Detection of GRB 210217A
- GRB 210217A: Liverpool Telescope First Hour Observations
- GRB 210217A: Swift-BAT refined analysis
- GRB 210217A: KAIT Optical Observations
- GRB 210217A: Enhanced Swift-XRT position
- GRB 210217A: NEXT early optical afterglow observations
- GRB 210217A: Swift detection of a burst with an optical counterpart