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"17 results found.
- GRB 150120B: GMG observation
- GRB 150120B: Khureltogot optical observations
- GRB 150120B: Mondy optical observations
- GRB 150120B: RATIR Optical and NIR Observations
- GRB 150120B: FTN early optical light curve
- GRB150120B: Xinglong TNT optical observation
- GRB 150120B: Swift/UVOT Upper Limits
- GRB 150120B, Optical observations
- GRB 150120B: GROND Afterglow Detection
- GRB 150120B: Additional P60 observations
- GRB 150120B: MITSuME Okayama upper limits
- GRB 150120B: Swift-BAT refined analysis
- GRB 150120B: Swift-XRT refined Analysis
- GRB 150120B: Enhanced Swift-XRT position
- GRB 150120B: FTN optical afterglow confirmation
- GRB 150120B: P60 optical afterglow
- GRB 150120B: Swift detection of a burst