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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"

45653 results found.

  1. Correction to GCN Circ 3474 on GRB050525A
  2. GRB 050721A: Early Swift XRT analysis results
  3. GRB050721A: optical decay
  4. GRB 050721: optical afterglow confirmed
  5. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  6. GRB 050721a: Optical Observations
  7. GRB050721A: Swift-BAT detection of a weak burst
  8. GRB 050709: Refined Spectral and Temporal Properties
  9. GRB 050717: PROMPT RcIc Observations
  10. GRB050714b: Radio Observation
  11. GRB050712: Radio Observations
  12. GRB 050714a: Refined XRT analysis and afterglow confirmation
  13. GRB050713a: Radio Observation
  14. Swift-BAT trigger 146731 is not a real GRB
  15. GRB 050712, Tautenburg optical afterglow observations
  16. Swift-BAT detection of a possible GRB
  17. GRB 050714B: VLT R-band observations
  18. GRB 050717: Additional LCO observations
  19. GRB050717
  20. GRB 050716; J-band observations
  21. Konus-Wind observation of GRB 050717
  22. GRB 050717: LCO near-IR observations
  23. Swift/UVOT Observations of GRB 050717
  24. GRB 050717: Swift-BAT refined analysis
  25. GRB 050717: Refined XRT analysis.
  26. GRB050712: optical limits
  27. GRB050717: Swift XRT position
  28. Swift detection of GRB 050717
  29. GRB 050716 - UKIRT identification of candidate afterglow
  30. Swift UVOT Observations of GRB 050716
  31. GRB 050716: Refined XRT analysis.
  32. GRB050716: Refined analysis of the Swift-BAT burst
  33. GRB 050716: Lulin B and R band optical observations
  34. GRB050716, optical observation
  35. GRB 050716: Optical Observations
  36. GRB050716: Faulkes North Telescope observation
  37. GRB050716: Correction to sign in XRT coordinate
  38. Swift/BAT detection of GRB 050716
  39. GRB050715: Refined analysis of the Swift-BAT burst
  40. GRB 050715: Swift-BAT detection
  41. Swift UVOT Observations of GRB 050714B
  42. Konus-Wind observation of GRB 050713A
  43. GRB 050714B: refined XRT analysis
  44. GRB 050713b: RTT150 optical observations
  45. GRB 050714B: candidate afterglow does not fade
  46. GRB050714B: Refined analysis of the Swift-BAT burst
  47. GRB 050714B: optical afterglow
  48. Swift detection of a long transient (GRB 050714B?)
  49. GRB 050709: optical afterglow candidate
  50. GRB 050714, R-band candidate
  51. GRB 050714: Swift XRT afterglow position
  52. GRB 050714, optical observations
  53. GRB 050714A: ROTSE-III Optical Limits
  54. GRB 050714 - A long GRB detected with INTEGRAL
  55. GRB 050713A: XRT refined analysis
  56. GRB 050709: Spectroscopy
  57. GRB 050713A: RAPTOR detection of early optical emission
  58. GRB050713B :Swift/UVOT observations
  59. GRB050713b: XRT refined analysis
  60. GRB050712: TNG R-band observations
  61. GRB 050713B: Swift-BAT Refined Analysis
  62. Swift-BAT Trigger 145729 is not a GRB
  63. GRB 050713A: Swift/UVOT observation
  64. GRB 050713A : Swift-BAT Refined Analysis
  65. GRB050712: Swift UVOT Observation of Afterglow Emission
  66. GRB 050713A : Lulin R-band observation
  67. GRB 050713A XMM-Newton observation
  68. GRB 050713b : Lulin R-band observations
  69. GRB050713B: Faulkes North Telescope observation
  70. RBO RI observations of GRB 050713A
  71. GRB 050713B
  72. GRB050709 : Chandra source optical counterpart
  73. GRB050713: Liverpool Telescope prompt observations
  74. GRB 050712, optical observations
  75. GRB 050713 : Planned XMM-Newton observation
  76. GRB050709: Candidate X-ray Afterglow from Chandra
  77. GRB 050713, R-band observations at NOT
  78. GRB 050713: ARC NIR Detections and Identification of Fading
  79. GRB050713: possible I-band afterglow
  80. GRB 050713: Swift detection of Bright Burst
  81. GRB 050713A: ROTSE-III Optical Limits
  82. GRB050712: XRT refined analysis
  83. GRB050709: Radio Observations
  84. GRB 050709: Swift UVOT and XRT observations
  85. GRB 050712: Swift-BAT Refined Analysis
  86. GRB050712: UVOT candidate optical counterpart
  87. GRB 050712: Swift XRT afterglow position
  88. GRB 050712: Swift detection of a weak burst
  89. GRB 050709: LCO40 Observations
  90. GRB050709, optical observations
  91. GRB050709: A Possible Short-Hard GRB Localized by HETE
  92. PROMPT Rc Observations of GRB 050709
  93. GRB 050525a: PROMPT VRcIc Detections
  94. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  95. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  96. GRB 050626 optical observations
  97. GRB 050626: Swift XRT observations
  98. GRB 050701
  99. GRB 050701, optical observations
  100. GRB 050408: ARC 3.5-meter NIR Observations

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