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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').
  1. GRB980425: Radio Observations
  2. GRB 980425 optical observations
  3. report on BSAX observations of GRB980425
  4. GRB 980425 optical observations
  5. GRB 980329 ROSAT observation
  6. GRB980326 X-ray Observations
  7. GRB980326, optical observations
  8. GRB980326, optical observations
  9. GRB980329, Fading IR counterpart to radio source
  10. GRByymmdd, Announcement of automation
  11. GRB980326 IPN annulus
  12. GRB980329
  13. GRB980329 Keck K-band observations
  14. GRB980329 sub-millimeter observations
  15. GRB980329 IPN annulus
  16. GRB980329 optical observations
  17. GRB980329 near-IR observations
  18. GRB980329 near-IR observations
  19. GRB980329 optical observations
  20. GRB980329 infrared observations
  21. GRB980329 optical observations
  22. GRB980326 optical observations
  23. GRB980329 optical observations
  24. GRB980329 VLA observations
  25. GRB980329 near IR observations
  26. GRB980329 optical observations
  27. GRB980329 optical observations
  28. GRB980329 optical observations
  29. GRB980326 optical observations
  30. GRB980326 optical observations
  31. GRB980326 optical observations
  32. GRB980326 optical observations
  33. GRB970508 SAO RAS optical observations
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