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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. Swift/UVOT observations of GRB100702A
  2. Konus-Wind observation of GRB 100621A
  3. GRB 100621A: IRSF/SIRIUS NIR Observation
  4. GRB 100621A MOA-II optical limit
  5. GRB 100621A: Swift/UVOT observations
  6. GRB 100621A: Swift XRT refined analysis
  7. GRB 100621A: VLT/X-shooter redshift
  8. GRB 100621A: Swift-BAT refined analysis
  9. GRB 100621A: GROND observation of bright NIR afterglow
  10. GRB 100621A: Enhanced Swift-XRT position
  11. GRB 100621A: Prompt enhanced Swift-XRT position
  12. GRB 100621A: ROTSE-III Optical Limits
  13. GRB 100621A: 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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