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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"

35335 results found.

  1. GRB 060516: Refined analysis of the Swift-BAT burst
  2. GRB 060512: TNG optical spectroscopy
  3. GRB 060516: Swift detection of a burst
  4. GRB 060505 BAT refined analysis
  5. GRB 060515 BAT refined analysis
  6. GRB 060512: TAROT optical observation
  7. GRB 060515: Swift/XRT Team refined analysis
  8. GRB 060515: Swift/UVOT Upper Limits
  9. GRB 060515: Swift/XRT position
  10. GRB 060515: Super-LOTIS Observations
  11. GRB060515: Swift/UVOT initial observation
  12. GRB 060515: TAROT optical observation
  13. GRB 060515: ROTSE-III Optical Limits
  14. GRB 060515: Swift detection of a burst
  15. VLT optical spectroscopy of GRB 060512
  16. Swift/UVOT observations of GRB060512.
  17. GRB 060512: Subaru NIR observation
  18. GRB060512: Swift XRT Team refined analysis
  19. GRB 060512: 1.54m Kuiper Observations
  20. GRB 060512: Detection of NIR afterglow
  21. GRB 060512: P60 Observations
  22. GRB 060512: Swift-BAT Refined Analysis
  23. GRB 060505 - OT candidate + galaxy spectrum
  24. GRB 060512: optical decay
  25. GRB 060512: REM NIR observations
  26. GRB060512 - SDSS Pre-Burst Observations
  27. GRB060512 Name Correction: LT Afterglow detection
  28. GRB060512: Liverpool Telescope Afterglow detection
  29. GRB 060512: Swift detection of a burst with an optical afterglow
  30. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  31. GRB 060505: X-ray afterglow - Correction -
  32. GRB 060505: X-ray afterglow
  33. Konus-Wind observation of GRB 060510A
  34. GRB060418: optical observations
  35. GRB 060428a, SMARTS optical/IR afterglow detection
  36. GRB060510B: Swift XRT refined analysis
  37. GRB 060510B: Swift/UVOT Upper Limits
  38. GRB 060510A: Refined analysis of the Swift-BAT burst
  39. GRB 060510B: Swift-BAT Refined Analysis
  40. GRB060510A: XRT refined analysis
  41. GRB060510 - SDSS Pre-Burst Observations
  42. GRB 060510b: Redshift
  43. GRB060510B : Faulkes North Telescope detection
  44. GRB 060510B : Planned XMM-Newton observation
  45. GRB 060510b: Gemini NIR observations
  46. GRB 060510B: Super-LOTIS Observations
  47. GRB 060510b: NIR observations
  48. GRB 060510B: Coordinate correction
  49. GRB 060510B: MDM Observations and candidate OT
  50. GRB 060510B: Swift detection of a burst
  51. GRB 060510: Swift detection of a burst with optical transient
  52. GRB060507: optical afterglow detection
  53. GRB060502B: improvement in the XRT afterglow position
  54. GRB 060507: BART limit
  55. GRB 060507: Final Refined analysis of the Swift-BAT burst
  56. GRB 060507: Swift-BAT Refined Analysis
  57. GRB 060505: PROMPT Observations
  58. GRB 060507: Swift/UVOT Upper Limits
  59. GRB 060507: Swift XRT Team Refined Analysis
  60. GRB 060507: MDM Optical Upper Limit
  61. GRB060507: Swift XRT position
  62. GRB 060507: Swift detection of a burst
  63. GRB 060429: Suzaku WAM observation
  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. Short GRB 060502B: Tautenburg Observation
  83. GRB 060427B Milagro GeV/TeV Observations
  84. GRB 060502A: TTT Observations
  85. GRB 060501: P60 Observations and Candidate Retraction
  86. GRB 060502B: Xinglong optical observation
  87. GRB 060502B: MASTER optical observations
  88. GRB 060502B: Swift detection of a short burst
  89. GRB 060502: Swift-BAT refined analysis
  90. GRB060502: Gemini spectroscopy
  91. GRB 060502: APO Spectroscopic Observations
  92. GRB 060502: P60 Afterglow Confirmation
  93. GRB 060502: Swift detection of a burst with an optical counterpart
  94. GRB 060501: MDM Observations
  95. GRB060501: Super-LOTIS observations
  96. GRB 060501: Refined analysis of the Swift-BAT burst
  97. GRB060501: Swift XRT position
  98. GRB 060501: ROTSE-III Optical Limits
  99. GRB 060501: Swift detection of a burst
  100. IPN triangulation of GRB060429 (short/hard)

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