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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 060522: Swift/XRT Team refined analysis
  2. GRB 060522: Swift-BAT Refined Analysis
  3. GRB 060522: REM NIR observations
  4. GRB 060522: TNG optical observations
  5. GRB 060522: Swift detection of a burst with possible optical afterglow
  6. GRB 060512: reanalysis of optical spectra
  7. GRB 060515: NIR observation
  8. GRB 060210: Jet Break in the XRT light curve
  9. GRB 060516: Refined analysis of the Swift-BAT burst
  10. GRB 060512: TNG optical spectroscopy
  11. GRB 060516: Swift detection of a burst
  12. GRB060515: P200 NIR Observations
  13. GRB 060505 BAT refined analysis
  14. GRB 060515 BAT refined analysis
  15. GRB 060512: TAROT optical observation
  16. GRB 060515: Swift/XRT Team refined analysis
  17. GRB 060515: Swift/UVOT Upper Limits
  18. GRB 060515: Swift/XRT position
  19. GRB 060515: Super-LOTIS Observations
  20. GRB060515: Swift/UVOT initial observation
  21. GRB 060515: TAROT optical observation
  22. GRB 060515: ROTSE-III Optical Limits
  23. GRB 060515: Swift detection of a burst
  24. VLT optical spectroscopy of GRB 060512
  25. Swift/UVOT observations of GRB060512.
  26. GRB 060512: Subaru NIR observation
  27. GRB060512: Swift XRT Team refined analysis
  28. GRB 060512: 1.54m Kuiper Observations
  29. GRB 060512: Detection of NIR afterglow
  30. GRB 060512: P60 Observations
  31. GRB 060512: Swift-BAT Refined Analysis
  32. GRB 060505 - OT candidate + galaxy spectrum
  33. GRB 060512: optical decay
  34. GRB 060512: REM NIR observations
  35. GRB060512 - SDSS Pre-Burst Observations
  36. GRB060512 Name Correction: LT Afterglow detection
  37. GRB060512: Liverpool Telescope Afterglow detection
  38. GRB 060512: Swift detection of a burst with an optical afterglow
  39. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  40. GRB 060505: X-ray afterglow - Correction -
  41. GRB 060505: X-ray afterglow
  42. Konus-Wind observation of GRB 060510A
  43. GRB060418: optical observations
  44. GRB 060428a, SMARTS optical/IR afterglow detection
  45. GRB060510B: Swift XRT refined analysis
  46. GRB 060510B: Swift/UVOT Upper Limits
  47. GRB 060510A: Refined analysis of the Swift-BAT burst
  48. GRB 060510B: Swift-BAT Refined Analysis
  49. GRB060510A: XRT refined analysis
  50. GRB060510 - SDSS Pre-Burst Observations
  51. GRB 060510b: Redshift
  52. GRB060510B : Faulkes North Telescope detection
  53. GRB 060510B : Planned XMM-Newton observation
  54. GRB 060510b: Gemini NIR observations
  55. GRB 060510B: Super-LOTIS Observations
  56. GRB 060510b: NIR observations
  57. GRB 060510B: Coordinate correction
  58. GRB 060510B: MDM Observations and candidate OT
  59. GRB 060510B: Swift detection of a burst
  60. GRB 060510: Swift detection of a burst with optical transient
  61. GRB060507: optical afterglow detection
  62. GRB060502B: improvement in the XRT afterglow position
  63. GRB 060507: BART limit
  64. GRB 060507: Final Refined analysis of the Swift-BAT burst
  65. GRB 060507: Swift-BAT Refined Analysis
  66. GRB 060505: PROMPT Observations
  67. GRB 060507: Swift/UVOT Upper Limits
  68. GRB 060507: Swift XRT Team Refined Analysis
  69. GRB 060507: MDM Optical Upper Limit
  70. GRB060507: Swift XRT position
  71. GRB 060507: Swift detection of a burst
  72. GRB 060429: Suzaku WAM observation
  73. GRB060505: Swift/UVOT Observations
  74. GRB 060505: Swift XRT Team Refined Analysis
  75. GRB060425: new MASTER survey method
  76. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  77. GRB 060505: Swift XRT afterglow canditate position
  78. GRB 060502b: Second epoch Gemini observations
  79. GRB 060505: Swift-BAT detection of a weak burst
  80. GRB 060428B: spectroscopy
  81. GRB 060502B: optical observations
  82. GRB 060502B: AROMA refined photometric calibration
  83. GRB 060502B MDM Follow-up Observation
  84. GRB 060502b: Gemini imaging and spectroscopy
  85. GRB060502A, optical observation
  86. GRB 060502B: Swift/UVOT upper limits
  87. GRB 060502A: Swift/UVOT source detection
  88. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  89. GRB 060502B: MDM Optical Observation
  90. GRB 060502B: AROMA optical observations
  91. GRB 060502B: Refined analysis of the Swift-BAT short burst
  92. GRB060502B: Swift XRT Team refined analysis
  93. Short GRB 060502B: Tautenburg Observation
  94. GRB 060427B Milagro GeV/TeV Observations
  95. GRB 060502A: TTT Observations
  96. GRB060502B: correction to XRT position
  97. GRB 060501: P60 Observations and Candidate Retraction
  98. GRB 060502B: Xinglong optical observation
  99. GRB 060502B: MASTER optical observations
  100. GRB 060502B: Swift detection of a short burst

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