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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"

940 results found.

  1. GRB 100925A / MAXI J1659-152: SARA-S Observations
  2. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  3. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  4. GRB 100925A/MAXI J1659-152 - NOT optical observations
  5. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  6. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  7. GRB 100823A: MAXI/GSC detection
  8. XRF 100701A : MAXI/GSC detection of a probable XRF
  9. XRF 100616a : MAXI/GSC detection of a probable XRF
  10. GRB 100510A: Fermi GBM detection/observation
  11. GRB 100510A: MAXI/GSC detection
  12. GRB 100415A: MAXI/GSC detection of a probable GRB
  13. Short X-ray Transient detected by MAXI/GSC
  14. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  15. Short X-ray Transient detected by MAXI/GSC
  16. Short X-ray Transient, RIMOTS optical upper limits
  17. Short X-ray Transient Detection by MAXI/GSC
  18. IPN Triangulation of GRB091120
  19. Konus-Wind observation of GRB 091120
  20. GRB 091120: MAXI GSC detection
  21. GRB 090926B: MAXI GSC detection
  22. GRB 090831A: Suzaku WAM observation of the prompt emission
  23. GRB 090831A: IPN Triangulation
  24. GRB 090831: MAXI GSC detection
  25. GRB 090812: Swift detection of a burst with an optical counterpart
  26. Konus-Wind and Konus-RF observations of GRB 090709A
  27. GRB 090205: Swift/UVOT Upper Limits
  28. GRB 090111: Swift UVOT Upper Limits
  29. GRB081230: Swift-XRT refined analysis
  30. Konus-Wind observation of GRB 051028
  31. GRB050726: Swift UVOT observations
  32. GRB050712: Swift UVOT Observation of Afterglow Emission
  33. IPN triangulation of GRB021211B (two large error boxes)
  34. GRB 990506 Radio Transient
  35. GRB 990506 optical observation
  36. GRB 990506 R band observations
  37. GRB 990506 Radio Observations
  38. GRB 990506: BATSE Observations
  39. GRB 990506, Optical Observations
  40. GRB 990506, optical observations

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