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 090529: CrAO optical upper limit
- GRB 090529: MTM-500 optical observations
- GRB 090529: Mt.Terskol optical observations
- GRB090529: Further NOT optical observations
- GRB 090529: MITSuME optical observation
- GRB 090529: VLT spectroscopic redshift
- GRB 090529: NOT optical observations
- GRB 090529: Swift-XRT refined analysis
- GRB 090529: OSN optical observations
- GRB 090529: optical observations
- GRB 090529: TLS Afterglow Observations
- GRB090529: UVOT/Swift detection of a brightening optical afterglow
- GRB 090529: Swift-BAT refined analysis
- GRB 090529: Enhanced Swift-XRT position
- GRB 090529: Preliminary Swift/UVOT Upper Limit
- GRB 090529: Xinglong TNT optical observation
- GRB 090529: Swift detection of a burst