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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"

1146 results found.

  1. GRB 110201A: Subaru/MOIRCS Ks-band photometry
  2. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  3. GRB 090709A: evidence for a very red afterglow at low z
  4. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  5. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  6. GRB 090709A: Subaru NIR observation
  7. GRB 090417B: Subaru NIR Observations
  8. GRB 090118: Subaru NIR Observation
  9. GRB 080325: Subaru detection of NIR afterglow candidate
  10. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  11. GRB 071021: Subaru NIR observation
  12. GROND upper limits of GRB 070521
  13. GRB 070521: Subaru observations and possible host detection
  14. GRB 070520A: Subaru Observations
  15. GRB 060904A: Subaru NIR observation
  16. GRB 060512: Subaru NIR observation
  17. GRB 060206: near-infrared observations (JK' imaging)
  18. GRB 060206: Subaru/FOCAS optical spectroscopy
  19. GRB 050904: Subaru Optical Spectroscopy
  20. Subaru Observations of GRB050724
  21. GRB 050509B and short GRB-SN association? (corrected)
  22. GRB 050509B and short GRB-SN association?
  23. GRB 050509B: Subaru Optical Observations
  24. GRB 050412: Subaru observations
  25. GRB 050408: Subaru Observations
  26. GRB 040916: Afterglow Color at Early Times
  27. GRB 040924: detection of possible host galaxy by Subaru
  28. GRB 040924: NIR finding chart
  29. GRB 040924: Subaru NIR observation
  30. XRF040916: continuing decay of OT
  31. XRF040916: Optical Transient Candidate by Subaru
  32. GRB 031220: Subaru observation
  33. XRF 030723: Subaru Optical Observations
  34. GRB030913: Subaru Optical Observations
  35. GRB030329: Subaru Optical Spectroscopy
  36. GRB030226: optical observations and refined redshift
  37. GRB 030226 Optical Spectra and R,I,z' Imaging
  38. Fading Optical Source in the Field of GRB020531
  39. GRB020331 NIR observation at KPNO (re-submission)
  40. GRB02033 NIR observation at KPNO
  41. GRB020305: Subaru Optical Observations
  42. GRB011019: Subaru Optical Observations
  43. GRB 010222
  44. GRB000926 K'-band Observation
  45. GRB000301C, near-infrared observations (JHK' imaging)
  46. GRB000301C, near-infrared observations (JHK' photometry)

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