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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. Radio observation of GRB 081121 with ATCA
  2. Konus-Wind observation of GRB 081121
  3. GRB 081121, SMARTS optical/IR afterglow observations
  4. GRB081121: Fermi GBM detection
  5. GRB081121: Refined Swift/UVOT observations
  6. GRB 081121: Swift-XRT refined analysis
  7. GRB 081121: Magellan Redshift
  8. GRB 081121: Enhanced Swift-XRT position
  9. GRB 081121: GROND observations
  10. GRB 081121: Swift-BAT refined analysis
  11. GRB 081121: Swift detection of a burst
  12. GRB 081121: ROTSE-III Detection of Optical Counterpart

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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