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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"

13 results found.

  1. GRB 090519: Swift-XRT refined analysis
  2. GRB 090519: NOT refined analysis
  3. GRB 090519: VLT spectroscopic redshift
  4. GRB 090519: GROND observation
  5. GRB 090519: Swift/UVOT Upper Limits
  6. GRB 090519, Swift-BAT refined analysis
  7. GRB 090519: Enhanced Swift-XRT position
  8. GRB 090519: Limits from BOOTES-1B
  9. GRB 090519: NOT afterglow candidate
  10. GRB 090519: FARO Chante Perdrix Observatory optical observations
  11. GRB 090519: TAROT Calern observatory optical observations
  12. GRB 090519: Swift detection of a burst
  13. GRB050319: radio observation

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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