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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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').
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"

12 results found.

  1. GRB 230816A: Swift-BAT refined analysis
  2. GRB 230816A: SVOM/C-GFT optical detection
  3. GRB 230816A: Swift-XRT refined Analysis
  4. GRB 230816A: Osservatorio Astronomico "Nastro Verde" optical observations
  5. GRB 230816A: Enhanced Swift-XRT position
  6. GRB230816A: Possible host and GIT detection of optical counterpart
  7. GRB 230816A: Tautenburg observations
  8. GRB 230816A: AKO Optical Observations
  9. GRB 230816A: TShAO and Assy optical observations
  10. GRB 230816A: SAO RAS optical observations
  11. GRB 230816A: Nanshan/HMT optical afterglow detection
  12. GRB 230816A: Swift detection of a burst

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

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