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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 060512: Subaru NIR observation
  2. GRB060512: Swift XRT Team refined analysis
  3. GRB 060512: 1.54m Kuiper Observations
  4. GRB 060512: Detection of NIR afterglow
  5. GRB 060512: P60 Observations
  6. GRB 060512: Swift-BAT Refined Analysis
  7. GRB 060505 - OT candidate + galaxy spectrum
  8. GRB 060512: optical decay
  9. GRB 060512: REM NIR observations
  10. GRB060512 - SDSS Pre-Burst Observations
  11. GRB060512 Name Correction: LT Afterglow detection
  12. GRB060512: Liverpool Telescope Afterglow detection
  13. GRB 060512: Swift detection of a burst with an optical afterglow
  14. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  15. GRB 060505: X-ray afterglow - Correction -
  16. GRB 060505: X-ray afterglow
  17. Konus-Wind observation of GRB 060510A
  18. GRB060418: optical observations
  19. GRB 060428a, SMARTS optical/IR afterglow detection
  20. GRB060510B: Swift XRT refined analysis
  21. GRB 060510B: Swift/UVOT Upper Limits
  22. GRB 060510A: Refined analysis of the Swift-BAT burst
  23. GRB 060510B: Swift-BAT Refined Analysis
  24. GRB060510A: XRT refined analysis
  25. GRB060510 - SDSS Pre-Burst Observations
  26. GRB 060510b: Redshift
  27. GRB060510B : Faulkes North Telescope detection
  28. GRB 060510B : Planned XMM-Newton observation
  29. GRB 060510b: Gemini NIR observations
  30. GRB 060510B: Super-LOTIS Observations
  31. GRB 060510b: NIR observations
  32. GRB 060510B: Coordinate correction
  33. GRB 060510B: MDM Observations and candidate OT
  34. GRB 060510B: Swift detection of a burst
  35. GRB 060510: Swift detection of a burst with optical transient
  36. GRB060507: optical afterglow detection
  37. GRB060502B: improvement in the XRT afterglow position
  38. GRB 060507: BART limit
  39. GRB 060507: Final Refined analysis of the Swift-BAT burst
  40. GRB 060507: Swift-BAT Refined Analysis
  41. GRB 060505: PROMPT Observations
  42. GRB 060507: Swift/UVOT Upper Limits
  43. GRB 060507: Swift XRT Team Refined Analysis
  44. GRB 060507: MDM Optical Upper Limit
  45. GRB060507: Swift XRT position
  46. GRB 060507: Swift detection of a burst
  47. GRB 060429: Suzaku WAM observation
  48. GRB060505: Swift/UVOT Observations
  49. GRB 060505: Swift XRT Team Refined Analysis
  50. GRB060425: new MASTER survey method
  51. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  52. GRB 060505: Swift XRT afterglow canditate position
  53. GRB 060502b: Second epoch Gemini observations
  54. GRB 060505: Swift-BAT detection of a weak burst
  55. GRB 060428B: spectroscopy
  56. GRB 060502B: optical observations
  57. GRB 060502B: AROMA refined photometric calibration
  58. GRB 060502B MDM Follow-up Observation
  59. GRB 060502b: Gemini imaging and spectroscopy
  60. GRB060502A, optical observation
  61. GRB 060502B: Swift/UVOT upper limits
  62. GRB 060502A: Swift/UVOT source detection
  63. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  64. GRB 060502B: MDM Optical Observation
  65. GRB 060502B: AROMA optical observations
  66. GRB 060502B: Refined analysis of the Swift-BAT short burst
  67. GRB060502B: Swift XRT Team refined analysis
  68. Short GRB 060502B: Tautenburg Observation
  69. GRB 060427B Milagro GeV/TeV Observations
  70. GRB 060502A: TTT Observations
  71. GRB060502B: correction to XRT position
  72. GRB 060501: P60 Observations and Candidate Retraction
  73. GRB 060502B: Xinglong optical observation
  74. GRB 060502B: MASTER optical observations
  75. GRB 060502B: Swift detection of a short burst
  76. GRB060502: Swift-XRT refined analysis
  77. GRB 060502: Swift-BAT refined analysis
  78. GRB060502: Gemini spectroscopy
  79. GRB 060502: APO Spectroscopic Observations
  80. GRB060501: Swift UVOT followup observations
  81. GRB060502: Super-LOTIS Observations
  82. GRB 060502: P60 Afterglow Confirmation
  83. GRB 060502: Swift detection of a burst with an optical counterpart
  84. GRB 060501: MDM Observations
  85. GRB060501: Super-LOTIS observations
  86. GRB060501: P60 imaging and afterglow candidate
  87. GRB 060501: Refined analysis of the Swift-BAT burst
  88. GRB060501: Swift XRT position
  89. GRB 060501: ROTSE-III Optical Limits
  90. GRB 060501: Swift detection of a burst
  91. IPN triangulation of GRB060429 (short/hard)
  92. Konus-Wind observation of GRB 060427B
  93. GRB060428B - SDSS Pre-Burst Observations
  94. GRB060428B: optical observation
  95. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  96. GRB 060428B: MDM Observations
  97. GRB 060428A: PROMPT Observations
  98. GRB 060427B: MASTER optical observations
  99. GRB060428B: Swift XRT Team refined analysis
  100. GRB 060427B: IPN localization of a short hard burst

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