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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"

541 results found.

  1. GRB080310: Optical observation by MITSuME telescope
  2. GRB080307: Optical upper limits
  3. GRB080229: Possible optical afterglow
  4. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  5. GRB071118 MITSuME OAO optical observation
  6. GRB071112C: Errata of MITSuME Ic band photometry
  7. GRB 071112C MITSuME Akeno early optical observation
  8. GRB071112C MITSuME Okayama Optical Observation
  9. GRB 071020: MITSuME Akeno optical observations
  10. GRB071021: MITSuME Okayama Optical Upper Limits
  11. GRB 071011: MITSuME Optical Observations
  12. GRB 070917: MITSuME Akeno Ic upper limit
  13. GRB070616: Optical Observation by MITSuME Akeno
  14. GRB 070612B: Optical Observation by MITSuME Akeno
  15. GRB070616: Optical Observation by MITSuME Okayama
  16. GRB070612A: MITSuME Okayama Observation
  17. GRB 070610: MITSuME OAO optical upper limit
  18. GRB 070520A: MITSuME Akeno optical upper limits
  19. GRB 070419A: MITSuME Okayama Observations
  20. GRB 070311: MITSuME Okayama Optical Observation
  21. GRB 070220: MITSuME Okayama Optical Observation
  22. GRB070129: MITSuME optical observation
  23. GRB 070125: MITSuME Okayama optical observation
  24. GRB 061222A: MITSuME Akeno optical upper limits
  25. GRB 061222B: MITSuME Akeno optical upper limits
  26. GRB 061019: MITSuME upper limits
  27. GRB 060403: MITSuME optical observation
  28. GRB 060115: OT photometry with MITSuME
  29. GRB 060115: OT finding chart
  30. GRB 060115: MITSuME optical afterglow candidate
  31. GRB 060111B: MITSuME detection of optical afterglow
  32. GRB 060110: Mitsume optical observations
  33. GRB 060108: Mitsume optical observations
  34. GRB 060105: Mitsume optical observations
  35. GRB 051227: optical observation
  36. GRB051117B: optical observation
  37. GRB 050525: MITSuME Optical Observation in VRI
  38. GRB 050416: Mitsume optical observation
  39. GRB 050408: opitcal observation
  40. GRB 050209 I-band observation
  41. GRB 050124 I-band observation

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Download all Circulars as a .tar.gz archive:
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