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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"

16 results found.

  1. GRB 200306C: ALMA 3mm upper limit
  2. GRB 200306C: Swift-BAT refined analysis
  3. GRB 200306C: Swift/UVOT Detection
  4. GRB 200306C: Calar Alto 2.2m upper limit
  5. GRB 200306C: Swift-XRT refined Analysis
  6. GRB 200306C: Enhanced Swift-XRT position
  7. GRB 200306C: VIRT optical upper limits
  8. GRB 200306C: KCT upper limit of the optical afterglow
  9. GRB 200306C: LCO Optical Upper Limits
  10. GRB 200306C: OSN 1.5m afterglow detection
  11. GRB 200306C: Liverpool Telescope observations
  12. GRB 200306C: SAO RAS observations of OT
  13. GRB 200306C: GOTO upper limits
  14. GRB 200306C: BOOTES-1 detection of the optical afterglow
  15. GRB 200306C: FRAM-ORM afterglow detection
  16. GRB 200306C: Swift detection of a burst with an optical counterpart

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
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Open an issue.
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Get involved on GitHub.

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