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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"
  1. GRB 060505: X-ray afterglow
  2. Konus-Wind observation of GRB 060510A
  3. GRB060418: optical observations
  4. GRB 060428a, SMARTS optical/IR afterglow detection
  5. GRB060510B: Swift XRT refined analysis
  6. GRB 060510B: Swift/UVOT Upper Limits
  7. GRB 060510A: Refined analysis of the Swift-BAT burst
  8. GRB 060510B: Swift-BAT Refined Analysis
  9. GRB060510A: XRT refined analysis
  10. GRB060510 - SDSS Pre-Burst Observations
  11. GRB 060510b: Redshift
  12. GRB060510B : Faulkes North Telescope detection
  13. GRB 060510B : Planned XMM-Newton observation
  14. GRB 060510b: Gemini NIR observations
  15. GRB 060510B: Super-LOTIS Observations
  16. GRB 060510b: NIR observations
  17. GRB 060510B: Coordinate correction
  18. GRB 060510B: MDM Observations and candidate OT
  19. GRB 060510B: Swift detection of a burst
  20. GRB 060510: Swift detection of a burst with optical transient
  21. GRB060507: optical afterglow detection
  22. GRB060502B: improvement in the XRT afterglow position
  23. GRB 060507: BART limit
  24. GRB 060507: Final Refined analysis of the Swift-BAT burst
  25. GRB 060507: Swift-BAT Refined Analysis
  26. GRB 060505: PROMPT Observations
  27. GRB 060507: Swift/UVOT Upper Limits
  28. GRB 060507: Swift XRT Team Refined Analysis
  29. GRB 060507: MDM Optical Upper Limit
  30. GRB060507: Swift XRT position
  31. GRB 060507: Swift detection of a burst
  32. GRB 060429: Suzaku WAM observation
  33. GRB060505: Swift/UVOT Observations
  34. GRB 060505: Swift XRT Team Refined Analysis
  35. GRB060425: new MASTER survey method
  36. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  37. GRB 060505: Swift XRT afterglow canditate position
  38. GRB 060502b: Second epoch Gemini observations
  39. GRB 060505: Swift-BAT detection of a weak burst
  40. GRB 060428B: spectroscopy
  41. GRB 060502B: optical observations
  42. GRB 060502B: AROMA refined photometric calibration
  43. GRB 060502B MDM Follow-up Observation
  44. GRB 060502b: Gemini imaging and spectroscopy
  45. GRB060502A, optical observation
  46. GRB 060502B: Swift/UVOT upper limits
  47. GRB 060502A: Swift/UVOT source detection
  48. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  49. GRB 060502B: MDM Optical Observation
  50. GRB 060502B: AROMA optical observations
  51. GRB 060502B: Refined analysis of the Swift-BAT short burst
  52. GRB060502B: Swift XRT Team refined analysis
  53. Short GRB 060502B: Tautenburg Observation
  54. GRB 060427B Milagro GeV/TeV Observations
  55. GRB 060502A: TTT Observations
  56. GRB060502B: correction to XRT position
  57. GRB 060501: P60 Observations and Candidate Retraction
  58. GRB 060502B: Xinglong optical observation
  59. GRB 060502B: MASTER optical observations
  60. GRB 060502B: Swift detection of a short burst
  61. GRB060502: Swift-XRT refined analysis
  62. GRB 060502: Swift-BAT refined analysis
  63. GRB060502: Gemini spectroscopy
  64. GRB 060502: APO Spectroscopic Observations
  65. GRB060501: Swift UVOT followup observations
  66. GRB060502: Super-LOTIS Observations
  67. GRB 060502: P60 Afterglow Confirmation
  68. GRB 060502: Swift detection of a burst with an optical counterpart
  69. GRB 060501: MDM Observations
  70. GRB060501: Super-LOTIS observations
  71. GRB060501: P60 imaging and afterglow candidate
  72. GRB 060501: Refined analysis of the Swift-BAT burst
  73. GRB060501: Swift XRT position
  74. GRB 060501: ROTSE-III Optical Limits
  75. GRB 060501: Swift detection of a burst
  76. IPN triangulation of GRB060429 (short/hard)
  77. Konus-Wind observation of GRB 060427B
  78. GRB060428B - SDSS Pre-Burst Observations
  79. GRB060428B: optical observation
  80. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  81. GRB 060428B: MDM Observations
  82. GRB 060428A: PROMPT Observations
  83. GRB 060427B: MASTER optical observations
  84. GRB060428B: Swift XRT Team refined analysis
  85. GRB 060427B: IPN localization of a short hard burst
  86. GRB 060428B: Refined analysis of the Swift-BAT burst
  87. GRB 060428B: Xinglong I-band limit
  88. GRB 060428B: KAIT observations
  89. GRB060425:MASTER optical limit
  90. GRB 051117A: Bright host galaxy not confirmed
  91. GRB060428A: Swift/UVOT observations.
  92. GRB060428B, optical observation
  93. GRB 060428A: Refined analysis of the Swift-BAT burst
  94. GRB 060428b : Kiso R-band limit
  95. GRB060427:MASTER optical limit
  96. GRB 060428b: Optical afterglow candidate
  97. GRB060428A: Swift XRT Team refined analysis
  98. GRB 060428B: Swift detection of a burst
  99. GRB 060427: NIR observations
  100. GRB060427: Xinglong optical Observations

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