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"15 results found.
- GRB 190123A: IKI-GRB-FuN optical upper limit
- GRB 190123A: NEXT-0.6m optical limit
- GRB 190123A: AROMA-N Optical Observation
- GRB 190123A: Swift/UVOT Upper Limits
- GRB 190123A: COATLI Optical Observations
- GRB 190123A: Swift-BAT refined analysis
- GRB190123A: MITSuME Akeno optical upper limits
- GRB 190123A: GMG observational limit
- GRB 190123A: Swift-XRT refined Analysis
- GRB 190123A: GOTO optical limit
- GRB 190123A: Fermi GBM observation
- GRB 190123A: BOOTES-4/MET optical limit
- GRB 190123A: Enhanced Swift-XRT position
- GRB 190123A: MASTER Global Robotic Net optical observation
- GRB 190123A: Swift detection of a burst