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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"

33 results found.

  1. GRB 090313: optical observations
  2. GRB 090323 TLS detection - still bright
  3. GRB 090313: WSRT Radio Detection
  4. X-shooter observations of GRB 090313
  5. GRB 090313: VLT spectroscopy
  6. GRB090313: radio detection with the VLA
  7. GRB 090313, SMARTS optical/IR observations
  8. Further radio observation of GRB 090313
  9. Further Swift/UVOT observations of GRB 090313
  10. GRB 090313: detection with CARMA in 3mm band
  11. Radio detection of GRB090313
  12. GRB 090313: MITSuME Okayama observation
  13. GRB 090313: Additional Gemini-S photometry
  14. GRB 090313: WSRT Radio Observations
  15. GRB 090313: Light curve steepening
  16. GRB 090313: TAROT La Silla observatory optical detection
  17. GRB 090313: Gemini-S photometry
  18. GRB 090313: Zadko Telescope observations
  19. GRB 090313 - PAIRITEL NIR detections
  20. GRB 090313: Gemini-S redshift
  21. GRB 090313 optical observations
  22. GRB 090313: Ongoing plateau phase
  23. GRB 090313: Swift-XRT refined analysis
  24. GRB 090313: Swift/UVOT upper limits
  25. GRB 090313: Faulkes Telescope North observations
  26. GRB 090313: Sustained optical brightness (correction)
  27. GRB 090313: Swift-BAT refined analysis
  28. GRB 090313: Sustained optical brightness
  29. GRB 090313: SDSS object underlying the optical afterglow position
  30. GRB 090313, GROND observations
  31. GRB 090313: Swift detection of a burst
  32. GRB 090313: Swift detection of a burst
  33. GRB 090313 OA candidate

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