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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"

548 results found.

  1. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  2. GRB080605: optical observation with the MITSuME-OAO telescope
  3. GRB 080604: MITSuME Okayama observation
  4. GRB 080503: MITSuME Ishigakijima optical upper limits
  5. GRB 080503: MITSuME Akeno optical upper limits
  6. GRB 080325: MITSuME Akeno optical upper limits
  7. GRB080310 : Optical observations by LOAO and Lulin
  8. GRB080310: Optical observation by MITSuME telescope
  9. GRB080307: Optical upper limits
  10. GRB080229: Possible optical afterglow
  11. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  12. GRB071118 MITSuME OAO optical observation
  13. GRB071112C: Errata of MITSuME Ic band photometry
  14. GRB 071112C MITSuME Akeno early optical observation
  15. GRB071112C MITSuME Okayama Optical Observation
  16. GRB 071020: MITSuME Akeno optical observations
  17. GRB071021: MITSuME Okayama Optical Upper Limits
  18. GRB 071011: MITSuME Optical Observations
  19. GRB 070917: MITSuME Akeno Ic upper limit
  20. GRB070616: Optical Observation by MITSuME Akeno
  21. GRB 070612B: Optical Observation by MITSuME Akeno
  22. GRB070616: Optical Observation by MITSuME Okayama
  23. GRB070612A: MITSuME Okayama Observation
  24. GRB 070610: MITSuME OAO optical upper limit
  25. GRB 070520A: MITSuME Akeno optical upper limits
  26. GRB 070419A: MITSuME Okayama Observations
  27. GRB 070311: MITSuME Okayama Optical Observation
  28. GRB 070220: MITSuME Okayama Optical Observation
  29. GRB070129: MITSuME optical observation
  30. GRB 070125: MITSuME Okayama optical observation
  31. GRB 061222A: MITSuME Akeno optical upper limits
  32. GRB 061222B: MITSuME Akeno optical upper limits
  33. GRB 061019: MITSuME upper limits
  34. GRB 060403: MITSuME optical observation
  35. GRB 060115: OT photometry with MITSuME
  36. GRB 060115: OT finding chart
  37. GRB 060115: MITSuME optical afterglow candidate
  38. GRB 060111B: MITSuME detection of optical afterglow
  39. GRB 060110: Mitsume optical observations
  40. GRB 060108: Mitsume optical observations
  41. GRB 060105: Mitsume optical observations
  42. GRB 051227: optical observation
  43. GRB051117B: optical observation
  44. GRB 050525: MITSuME Optical Observation in VRI
  45. GRB 050416: Mitsume optical observation
  46. GRB 050408: opitcal observation
  47. GRB 050209 I-band observation
  48. GRB 050124 I-band observation

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