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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"

42176 results found.

  1. GRB 050724: spectroscopy of object in the XRT error circle
  2. GRB 050724: Optical limit
  3. GRB 050724: optical and near-IR observations
  4. GRB 050724: Optical imaging/astrometry
  5. GRB 050724: RTT150 optical observations
  6. GRB 050724: Swift/UVOT Upper Limit
  7. GRB 050724: early Swift XRT analysis results
  8. GRB050724: Refined analysis of the Swift-BAT possible short burst
  9. GRB 050724: possible host galaxy in DSS
  10. GRB050724: a short-burst detected by Swift
  11. GRB050723: XRT distributed coordinates are not related to the burst
  12. GRB 050721: early afterglow light curve
  13. GRB 050721A: Swift-BAT refined analysis
  14. GRB 050721A: Early Swift XRT analysis results
  15. GRB050721A: optical decay
  16. GRB 050721: optical afterglow confirmed
  17. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  18. GRB 050721a: Optical Observations
  19. GRB050721A: Swift-BAT detection of a weak burst
  20. GRB 050709: Refined Spectral and Temporal Properties
  21. GRB050714b: Radio Observation
  22. GRB050712: Radio Observations
  23. GRB 050714a: Refined XRT analysis and afterglow confirmation
  24. GRB050713a: Radio Observation
  25. GRB 050712, Tautenburg optical afterglow observations
  26. Swift-BAT detection of a possible GRB
  27. GRB 050714B: VLT R-band observations
  28. GRB 050717: Additional LCO observations
  29. GRB050717
  30. GRB 050716; J-band observations
  31. Konus-Wind observation of GRB 050717
  32. GRB 050717: LCO near-IR observations
  33. GRB 050717: Swift-BAT refined analysis
  34. GRB 050717: Refined XRT analysis.
  35. GRB050712: optical limits
  36. GRB050717: Swift XRT position
  37. Swift detection of GRB 050717
  38. GRB 050716 - UKIRT identification of candidate afterglow
  39. GRB 050716: Refined XRT analysis.
  40. GRB050716: Refined analysis of the Swift-BAT burst
  41. GRB 050716: Lulin B and R band optical observations
  42. GRB050716, optical observation
  43. GRB 050716: Optical Observations
  44. GRB050716: Faulkes North Telescope observation
  45. GRB050716: Correction to sign in XRT coordinate
  46. Swift/BAT detection of GRB 050716
  47. GRB050715: Refined analysis of the Swift-BAT burst
  48. GRB 050715: Swift-BAT detection
  49. Swift UVOT Observations of GRB 050714B
  50. Konus-Wind observation of GRB 050713A
  51. GRB 050714B: refined XRT analysis
  52. GRB 050713b: RTT150 optical observations
  53. GRB 050714B: candidate afterglow does not fade
  54. GRB050714B: Refined analysis of the Swift-BAT burst
  55. GRB 050714B: optical afterglow
  56. Swift detection of a long transient (GRB 050714B?)
  57. GRB 050709: optical afterglow candidate
  58. GRB 050714: Swift XRT afterglow position
  59. GRB 050714, optical observations
  60. GRB 050714A: ROTSE-III Optical Limits
  61. GRB 050714 - A long GRB detected with INTEGRAL
  62. GRB 050713A: XRT refined analysis
  63. GRB 050709: Spectroscopy
  64. GRB 050713A: RAPTOR detection of early optical emission
  65. GRB050713b: XRT refined analysis
  66. GRB050712: TNG R-band observations
  67. GRB 050713B: Swift-BAT Refined Analysis
  68. GRB 050713A : Swift-BAT Refined Analysis
  69. GRB050712: Swift UVOT Observation of Afterglow Emission
  70. GRB 050713A : Lulin R-band observation
  71. GRB 050713A XMM-Newton observation
  72. GRB 050713b : Lulin R-band observations
  73. GRB050713B: Faulkes North Telescope observation
  74. RBO RI observations of GRB 050713A
  75. GRB 050713B
  76. GRB050709 : Chandra source optical counterpart
  77. GRB050713: Liverpool Telescope prompt observations
  78. GRB 050712, optical observations
  79. GRB 050713 : Planned XMM-Newton observation
  80. GRB050709: Candidate X-ray Afterglow from Chandra
  81. GRB 050713, R-band observations at NOT
  82. GRB 050713: ARC NIR Detections and Identification of Fading
  83. GRB050713: possible I-band afterglow
  84. GRB 050713: Swift detection of Bright Burst
  85. GRB 050713A: ROTSE-III Optical Limits
  86. GRB050712: XRT refined analysis
  87. GRB050709: Radio Observations
  88. GRB 050709: Swift UVOT and XRT observations
  89. GRB 050712: Swift-BAT Refined Analysis
  90. GRB050712: UVOT candidate optical counterpart
  91. GRB 050712: Swift XRT afterglow position
  92. GRB 050712: Swift detection of a weak burst
  93. GRB 050709: LCO40 Observations
  94. GRB050709, optical observations
  95. GRB050709: A Possible Short-Hard GRB Localized by HETE
  96. GRB 050525a: PROMPT VRcIc Detections
  97. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  98. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  99. GRB 050626 optical observations
  100. GRB 050626: Swift XRT observations

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