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"14 results found.
- GRB 190613A: SEDM Observations
- GRB 190613A: Kitab and AbAO optical upper limit
- GRB 190613A: SEDM Observations
- GRB 190613A: FRAM-ORM afterglow detection
- GRB 190613A, Swift-BAT refined analysis
- GRB 190613A: Fermi GBM detection
- GRB 190613A: Swift/UVOT Detection
- GRB 190613A: Swift-XRT refined Analysis
- GRB 190613A: Enhanced Swift-XRT position
- GRB 190613A: MASTER OT detection
- GRB 190613A: KAIT Optical Afterglow Confirmation
- GRB 190613A: BALROG localization (Fermi Trigger 582091643 / GRB 190613172)
- GRB 190613A: Fermi GBM Final Real-time Localization
- GRB 190613A: Swift detection of a burst with an optical counterpart