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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"

19548 results found.

  1. GRB 980613: Optical transient and its host galaxy
  2. SGR1627-41, Refined IPN annulus location
  3. GRB 980613: Detection of the probable host galaxy
  4. SGR 1627-41
  5. GRB 980613 Optical Observations
  6. GRB 980613 optical observations
  7. Discovery of a new SGR source, SGR1627-41
  8. GRB980613 Optical Observations
  9. GRB980613 observations from Palomar
  10. GRB980613 Near Infra-Red Observations
  11. GRB971214 Secondary Standards
  12. GRB980519 Secondary Standards
  13. GRB 980519 Optical Observations
  14. GRB 980519
  15. GRB980519 optical observations
  16. GRB 980519 Optical Observations
  17. GRB980519 Optical Observations
  18. GRB 980519 Optical Observations
  19. GRB980515, BeppoSAX IAUC to be submitted
  20. BSAX Observations of GRB980425 field
  21. SAX J0840.7+2248 Optical Observations
  22. GRB980425: optical obs.
  23. GRB980425: Radio Observations
  24. report on BSAX observations of GRB980425
  25. GRB980326 X-ray Observations
  26. GRB980326, optical observations
  27. GRB980326, optical observations
  28. GRB980326 IPN annulus
  29. GRB980329 Keck K-band observations
  30. GRB980326 optical observations
  31. GRB980329 optical observations
  32. GRB980329 VLA observations
  33. GRB980329 optical observations
  34. GRB980326 optical observations
  35. Optical Observations of GRB 970508
  36. Near-IR follow-up on GRB 971227
  37. Optical Observations of the GRB 971227 field
  38. Optical Observations on GRB 971227
  39. GRB971227: Plaskett R-band observations
  40. GRB 971227: Optical clarifications
  41. GRB971227: Further CAHA R-band images
  42. GRB971227: LOTIS observations
  43. GRB 971227: CAHA R-band images
  44. GRB971214: Optical Observations and Calibrations
  45. GRB 971214: Optical Observations
  46. Radio Observations of GRB 971214 at the VLA
  47. GRB 971024: KPNO Optical Observations
  48. GRB 970828: Palomar Observations

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Download all Circulars as a .tar.gz archive (updated once a day):
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