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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

37256 results found.

  1. GRB 050721A: Early Swift XRT analysis results
  2. GRB050721A: optical decay
  3. GRB 050721: optical afterglow confirmed
  4. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  5. GRB 050721a: Optical Observations
  6. GRB 050709: Refined Spectral and Temporal Properties
  7. GRB 050717: PROMPT RcIc Observations
  8. GRB 050714a: Refined XRT analysis and afterglow confirmation
  9. Swift-BAT trigger 146731 is not a real GRB
  10. GRB 050712, Tautenburg optical afterglow observations
  11. Swift-BAT detection of a possible GRB
  12. GRB 050714B: VLT R-band observations
  13. GRB 050717: Additional LCO observations
  14. GRB050717
  15. GRB 050716; J-band observations
  16. Konus-Wind observation of GRB 050717
  17. GRB 050717: LCO near-IR observations
  18. Swift/UVOT Observations of GRB 050717
  19. GRB 050717: Swift-BAT refined analysis
  20. GRB 050717: Refined XRT analysis.
  21. GRB050712: optical limits
  22. Swift detection of GRB 050717
  23. GRB 050716 - UKIRT identification of candidate afterglow
  24. Swift UVOT Observations of GRB 050716
  25. GRB 050716: Refined XRT analysis.
  26. GRB 050716: Lulin B and R band optical observations
  27. GRB050716, optical observation
  28. GRB 050716: Optical Observations
  29. GRB050716: Faulkes North Telescope observation
  30. Swift/BAT detection of GRB 050716
  31. GRB 050715: Swift-BAT detection
  32. Swift UVOT Observations of GRB 050714B
  33. Konus-Wind observation of GRB 050713A
  34. GRB 050714B: refined XRT analysis
  35. GRB 050713b: RTT150 optical observations
  36. GRB 050714B: candidate afterglow does not fade
  37. GRB050714B: Refined analysis of the Swift-BAT burst
  38. GRB 050714B: optical afterglow
  39. Swift detection of a long transient (GRB 050714B?)
  40. GRB 050709: optical afterglow candidate
  41. GRB 050714, R-band candidate
  42. GRB 050714: Swift XRT afterglow position
  43. GRB 050714, optical observations
  44. GRB 050714A: ROTSE-III Optical Limits
  45. GRB 050714 - A long GRB detected with INTEGRAL
  46. GRB 050713A: XRT refined analysis
  47. GRB 050709: Spectroscopy
  48. GRB 050713A: RAPTOR detection of early optical emission
  49. GRB050713B :Swift/UVOT observations
  50. GRB050713b: XRT refined analysis
  51. GRB050712: TNG R-band observations
  52. GRB 050713B: Swift-BAT Refined Analysis
  53. Swift-BAT Trigger 145729 is not a GRB
  54. GRB 050713A: Swift/UVOT observation
  55. GRB 050713A : Swift-BAT Refined Analysis
  56. GRB050712: Swift UVOT Observation of Afterglow Emission
  57. GRB 050713A : Lulin R-band observation
  58. GRB 050713A XMM-Newton observation
  59. GRB 050713b : Lulin R-band observations
  60. GRB050713B: Faulkes North Telescope observation
  61. RBO RI observations of GRB 050713A
  62. GRB 050713B
  63. GRB050709 : Chandra source optical counterpart
  64. GRB050713: Liverpool Telescope prompt observations
  65. GRB 050712, optical observations
  66. GRB 050713 : Planned XMM-Newton observation
  67. GRB050709: Candidate X-ray Afterglow from Chandra
  68. GRB 050713, R-band observations at NOT
  69. GRB 050713: ARC NIR Detections and Identification of Fading
  70. GRB050713: possible I-band afterglow
  71. GRB 050713: Swift detection of Bright Burst
  72. GRB 050713A: ROTSE-III Optical Limits
  73. GRB050712: XRT refined analysis
  74. GRB 050709: Swift UVOT and XRT observations
  75. GRB 050712: Swift-BAT Refined Analysis
  76. GRB 050712: Swift XRT afterglow position
  77. GRB 050712: Swift detection of a weak burst
  78. GRB 050709: LCO40 Observations
  79. GRB050709: A Possible Short-Hard GRB Localized by HETE
  80. PROMPT Rc Observations of GRB 050709
  81. GRB 050525a: PROMPT VRcIc Detections
  82. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  83. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  84. GRB 050626 optical observations
  85. GRB 050626: Swift XRT observations
  86. GRB 050701
  87. GRB 050701, optical observations
  88. GRB 050408: ARC 3.5-meter NIR Observations
  89. GRB 050701: Refined XRT analysis
  90. Swift UVOT observations of GRB 050701
  91. GRB 050701: Swift XRT afterglow position
  92. Swift trigger 143708 is really GRB 050701
  93. GRB 050607, radio observations
  94. GRB 050626 - Correction to GCN 3552
  95. GRB 050626 - a long GRB detected with INTEGRAL
  96. GRB 050525A: Swift Late-Time Decay Rate
  97. H3804: A Possible New XRB Detected by HETE
  98. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  99. XRF 050509c: Optical monitoring
  100. IBAS Alert #2512 is NOT a GRB

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