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 190204A: CALET Gamma-Ray Burst Monitor detection
- GRB 190204A: Swift-BAT refined analysis
- Konus-Wind observation of GRB 190204A
- GRB 190204A: SAO RAS optical observations
- GRB 190204A: Mondy optical upper limit
- GRB 190204A: Swift/UVOT Detection
- GRB 190204A: Enhanced Swift-XRT position
- GRB 190204A: COATLI Optical Detection of the Fading Afterglow
- GRB 190204A: Swift-XRT refined Analysis
- GRB 190204A: AstroSat CZTI detection
- GRB 190204A: MAXI/GSC detection
- GRB 190204A: Swift detection of a burst with a possible optical counterpart