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.
- GRB071018: Correction to the GCN 6936
- GRB071018: Correction to the GCN 6936
- GRB071018: Correction to the GCN 6936
- GRB 071018: Possible OT from Xinglong TNT observation
- GRB 071013: 3rd TLS Epoch - constraints on variability
- GRB 071013: TNT optical data refined analysis
- GRB 071013: TLS 2nd epoch - Kornienko candidate constant
- GRB 071010B: TLS 2nd Epoch, refined analysis
- GRB 071013: TLS Upper Limit
- GRB 071013: Optical observations
- GRB 071013: optical observations at NOT
- GRB 071013, Swift-BAT refined analysis
- GRB 20071013: Xinglong TNT optical Upper Limit
- GRB 071013: Swift detection of a burst