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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

26 results found.

  1. GRB 080205: OA evolution from KAIT observations
  2. GRB060206: optical observation
  3. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  4. GRB 060206: SOAR Detections
  5. GRB060206, optical observations
  6. GRB 060206: Swift/UVOT Observations
  7. GRB 060206: near-infrared observations (JK' imaging)
  8. GRB 060206: WSRT Radio Observations
  9. GRB 060206: TTT Observations
  10. GRB 060206: More PROMPT Detections
  11. GRB 060206: Tenagra II Observations
  12. GRB 060206: PROMPT Detections
  13. GRB 060206: optical observations at Asiago
  14. GRB 060206: Subaru/FOCAS optical spectroscopy
  15. GRB 060206: IR Detection of the Afterglow
  16. GRB 060206: Lick 3m Spectroscopy
  17. GRB 060206: Super-LOTIS observations
  18. GRB 060206: Swift-BAT refined analysis
  19. GRB 060206 : Lulin optical observations
  20. GRB060206: Swift XRT Refined Analysis
  21. GRB 060206: Spectroscopic Redshift
  22. GRB060206: P60 Optical Observations
  23. GRB 060206: KAIT observations
  24. GRB060206: Swift XRT Position
  25. GRB 060206: RAPTOR observations of afterglow candidate variability.
  26. GRB 060206: High redshift burst

Advanced

Download all Circulars as a .tar.gz archive:
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