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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 060516: Swift detection of a burst
  2. GRB060515: P200 NIR Observations
  3. GRB 060505 BAT refined analysis
  4. GRB 060515 BAT refined analysis
  5. GRB 060512: TAROT optical observation
  6. GRB 060515: Swift/XRT Team refined analysis
  7. GRB 060515: Swift/UVOT Upper Limits
  8. GRB 060515: Swift/XRT position
  9. GRB 060515: Super-LOTIS Observations
  10. GRB060515: Swift/UVOT initial observation
  11. GRB 060515: TAROT optical observation
  12. GRB 060515: ROTSE-III Optical Limits
  13. GRB 060515: Swift detection of a burst
  14. VLT optical spectroscopy of GRB 060512
  15. Swift/UVOT observations of GRB060512.
  16. GRB 060512: Subaru NIR observation
  17. GRB060512: Swift XRT Team refined analysis
  18. GRB 060512: 1.54m Kuiper Observations
  19. GRB 060512: Detection of NIR afterglow
  20. GRB 060512: P60 Observations
  21. GRB 060512: Swift-BAT Refined Analysis
  22. GRB 060505 - OT candidate + galaxy spectrum
  23. GRB 060512: optical decay
  24. GRB 060512: REM NIR observations
  25. GRB060512 - SDSS Pre-Burst Observations
  26. GRB060512 Name Correction: LT Afterglow detection
  27. GRB060512: Liverpool Telescope Afterglow detection
  28. GRB 060512: Swift detection of a burst with an optical afterglow
  29. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  30. GRB 060505: X-ray afterglow - Correction -
  31. GRB 060505: X-ray afterglow
  32. Konus-Wind observation of GRB 060510A
  33. GRB060418: optical observations
  34. GRB 060428a, SMARTS optical/IR afterglow detection
  35. GRB060510B: Swift XRT refined analysis
  36. GRB 060510B: Swift/UVOT Upper Limits
  37. GRB 060510A: Refined analysis of the Swift-BAT burst
  38. GRB 060510B: Swift-BAT Refined Analysis
  39. GRB060510A: XRT refined analysis
  40. GRB060510 - SDSS Pre-Burst Observations
  41. GRB 060510b: Redshift
  42. GRB060510B : Faulkes North Telescope detection
  43. GRB 060510B : Planned XMM-Newton observation
  44. GRB 060510b: Gemini NIR observations
  45. GRB 060510B: Super-LOTIS Observations
  46. GRB 060510b: NIR observations
  47. GRB 060510B: Coordinate correction
  48. GRB 060510B: MDM Observations and candidate OT
  49. GRB 060510B: Swift detection of a burst
  50. GRB 060510: Swift detection of a burst with optical transient
  51. GRB060507: optical afterglow detection
  52. GRB060502B: improvement in the XRT afterglow position
  53. GRB 060507: BART limit
  54. GRB 060507: Final Refined analysis of the Swift-BAT burst
  55. GRB 060507: Swift-BAT Refined Analysis
  56. GRB 060505: PROMPT Observations
  57. GRB 060507: Swift/UVOT Upper Limits
  58. GRB 060507: Swift XRT Team Refined Analysis
  59. GRB 060507: MDM Optical Upper Limit
  60. GRB060507: Swift XRT position
  61. GRB 060507: Swift detection of a burst
  62. GRB 060429: Suzaku WAM observation
  63. GRB060505: Swift/UVOT Observations
  64. GRB 060505: Swift XRT Team Refined Analysis
  65. GRB060425: new MASTER survey method
  66. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  67. GRB 060505: Swift XRT afterglow canditate position
  68. GRB 060502b: Second epoch Gemini observations
  69. GRB 060505: Swift-BAT detection of a weak burst
  70. GRB 060428B: spectroscopy
  71. GRB 060502B: optical observations
  72. GRB 060502B: AROMA refined photometric calibration
  73. GRB 060502B MDM Follow-up Observation
  74. GRB 060502b: Gemini imaging and spectroscopy
  75. GRB060502A, optical observation
  76. GRB 060502B: Swift/UVOT upper limits
  77. GRB 060502A: Swift/UVOT source detection
  78. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  79. GRB 060502B: MDM Optical Observation
  80. GRB 060502B: AROMA optical observations
  81. GRB 060502B: Refined analysis of the Swift-BAT short burst
  82. GRB060502B: Swift XRT Team refined analysis
  83. Short GRB 060502B: Tautenburg Observation
  84. GRB 060427B Milagro GeV/TeV Observations
  85. GRB 060502A: TTT Observations
  86. GRB060502B: correction to XRT position
  87. GRB 060501: P60 Observations and Candidate Retraction
  88. GRB 060502B: Xinglong optical observation
  89. GRB 060502B: MASTER optical observations
  90. GRB 060502B: Swift detection of a short burst
  91. GRB060502: Swift-XRT refined analysis
  92. GRB 060502: Swift-BAT refined analysis
  93. GRB060502: Gemini spectroscopy
  94. GRB 060502: APO Spectroscopic Observations
  95. GRB060501: Swift UVOT followup observations
  96. GRB060502: Super-LOTIS Observations
  97. GRB 060502: P60 Afterglow Confirmation
  98. GRB 060502: Swift detection of a burst with an optical counterpart
  99. GRB 060501: MDM Observations
  100. GRB060501: Super-LOTIS observations

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