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"13 results found.
- GRB 190203A: Mondy optical observations
- GRB 190203A: Swift-BAT refined analysis
- GRB 190203A: AstroSat CZTI detection
- GRB190203A: UVOT analysis
- GRB 190203A: COATLI Optical Observations
- GRB 190203A: Liverpool Telescope near-IR observations
- Konus-Wind observation of GRB 190203A
- GRB 190203A: Swift-XRT refined Analysis
- GRB 190203A: MASTER OT detection
- GRB 190203A: Enhanced Swift-XRT position
- GRB 190203A: SAO RAS optical observations, afterglow fading
- GRB 190203A: Koshka Zeiss-1000 optical upper limit
- GRB 190203A: Swift detection of a burst with an optical counterpart