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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.

Lucene Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

23 results found.

  1. Redshift of GRB 110402A theoretically estimated (revised)
  2. GRB 110402A: fading optical afterglow
  3. Redshift of GRB 110402A theoretically estimated
  4. GRB 110402A: Suzaku WAM observation of the prompt emission
  5. GRB 110402A: LOAO Optical Observation
  6. GRB 110402A: Konus-Wind spectral lags and detailed energetics
  7. GRB 110402A: Fermi GBM detection
  8. GRB 110402A: optical observations in Mondy
  9. GRB 110402A afterglow observation
  10. GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
  11. GRB 110402A: Swift/UVOT detection of afterglow candidate
  12. GRB 110402A: Spectral lag indicates short hard burst
  13. Konus-Wind observation of GRB 110402A
  14. GRB 110402A: Konkoly observations
  15. GRB 110402A: Swift-BAT refined analysis
  16. GRB 110402A: Swift-XRT refined Analysis
  17. GRB 110402A: early optical limit by "Pi of the Sky"
  18. GRB 110402A: further NOT observations
  19. GRB 110402A: PAIRITEL NIR Upper Limits
  20. GRB 110402A: Enhanced Swift-XRT position
  21. GRB 110402A: NOT afterglow confirmation
  22. GRB 110402A: Liverpool Telescope Observations
  23. GRB 110402A: Swift detection of a burst

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Download all Circulars as a .tar.gz archive:
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