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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"

25904 results found.

  1. GRB 060526: TNG optical observations
  2. GRB 060526: ROTSE-III Observations of Optical Counterpart
  3. GRB 060526: Watcher Observations
  4. GRB 060526: Continued emission for the Swift burst
  5. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  6. GRB060505: VLT observations of the optical afterglow
  7. GRB 060413 : WIDGET simultaneous optical observations
  8. GRB 060522: Swift/UVOT Observations: Correction
  9. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  10. XMM-Newton observation of GRB060510b
  11. GRB060512: Late-Time P200 Observations
  12. GRB060522: z = 5.11 Keck-LRIS Redshift
  13. GRB 060522: Swift/XRT Team refined analysis
  14. GRB 060522: Swift-BAT Refined Analysis
  15. GRB 060522: REM NIR observations
  16. GRB 060522: TNG optical observations
  17. GRB 060522: Swift detection of a burst with possible optical afterglow
  18. GRB 060515: NIR observation
  19. GRB 060210: Jet Break in the XRT light curve
  20. GRB 060516: Refined analysis of the Swift-BAT burst
  21. GRB 060516: Swift detection of a burst
  22. GRB060515: P200 NIR Observations
  23. GRB 060505 BAT refined analysis
  24. GRB 060515 BAT refined analysis
  25. GRB 060512: TAROT optical observation
  26. GRB 060515: Swift/XRT Team refined analysis
  27. GRB 060515: Swift/UVOT Upper Limits
  28. GRB 060515: Swift/XRT position
  29. GRB 060515: Super-LOTIS Observations
  30. GRB060515: Swift/UVOT initial observation
  31. GRB 060515: TAROT optical observation
  32. GRB 060515: ROTSE-III Optical Limits
  33. GRB 060515: Swift detection of a burst
  34. VLT optical spectroscopy of GRB 060512
  35. Swift/UVOT observations of GRB060512.
  36. GRB060512: Swift XRT Team refined analysis
  37. GRB 060512: Detection of NIR afterglow
  38. GRB 060512: P60 Observations
  39. GRB 060512: Swift-BAT Refined Analysis
  40. GRB 060505 - OT candidate + galaxy spectrum
  41. GRB 060512: optical decay
  42. GRB 060512: REM NIR observations
  43. GRB060512 Name Correction: LT Afterglow detection
  44. GRB060512: Liverpool Telescope Afterglow detection
  45. GRB 060512: Swift detection of a burst with an optical afterglow
  46. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  47. GRB 060505: X-ray afterglow - Correction -
  48. GRB 060505: X-ray afterglow
  49. Konus-Wind observation of GRB 060510A
  50. GRB060418: optical observations
  51. GRB 060428a, SMARTS optical/IR afterglow detection
  52. GRB060510B: Swift XRT refined analysis
  53. GRB 060510B: Swift/UVOT Upper Limits
  54. GRB 060510A: Refined analysis of the Swift-BAT burst
  55. GRB 060510B: Swift-BAT Refined Analysis
  56. GRB060510A: XRT refined analysis
  57. GRB 060510b: Redshift
  58. GRB060510B : Faulkes North Telescope detection
  59. GRB 060510b: Gemini NIR observations
  60. GRB 060510B: Super-LOTIS Observations
  61. GRB 060510b: NIR observations
  62. GRB 060510B: MDM Observations and candidate OT
  63. GRB 060510B: Swift detection of a burst
  64. GRB 060510: Swift detection of a burst with optical transient
  65. GRB060507: optical afterglow detection
  66. GRB060502B: improvement in the XRT afterglow position
  67. GRB 060507: BART limit
  68. GRB 060507: Final Refined analysis of the Swift-BAT burst
  69. GRB 060507: Swift-BAT Refined Analysis
  70. GRB 060507: Swift/UVOT Upper Limits
  71. GRB 060507: Swift XRT Team Refined Analysis
  72. GRB 060507: MDM Optical Upper Limit
  73. GRB060507: Swift XRT position
  74. GRB 060507: Swift detection of a burst
  75. GRB060505: Swift/UVOT Observations
  76. GRB 060505: Swift XRT Team Refined Analysis
  77. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  78. GRB 060505: Swift XRT afterglow canditate position
  79. GRB 060502b: Second epoch Gemini observations
  80. GRB 060505: Swift-BAT detection of a weak burst
  81. GRB 060428B: spectroscopy
  82. GRB 060502B: optical observations
  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 060502B: MDM Optical Observation
  89. GRB 060502B: Refined analysis of the Swift-BAT short burst
  90. GRB060502B: Swift XRT Team refined analysis
  91. Short GRB 060502B: Tautenburg Observation
  92. GRB 060502A: TTT Observations
  93. GRB060502B: correction to XRT position
  94. GRB 060501: P60 Observations and Candidate Retraction
  95. GRB 060502B: Xinglong optical observation
  96. GRB 060502B: MASTER optical observations
  97. GRB 060502B: Swift detection of a short burst
  98. GRB060502: Swift-XRT refined analysis
  99. GRB 060502: Swift-BAT refined analysis
  100. GRB060502: Gemini spectroscopy

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