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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"

35948 results found.

  1. GRB 050724: possible host galaxy in DSS
  2. Swift-BAT trigger 147325 is not due to a real GRB
  3. GRB050723: XRT distributed coordinates are not related to the burst
  4. GRB 050721: early afterglow light curve
  5. GRB 050721A: Swift-BAT refined analysis
  6. Correction to GCN Circ 3474 on GRB050525A
  7. GRB 050721A: Early Swift XRT analysis results
  8. GRB050721A: optical decay
  9. GRB 050721: optical afterglow confirmed
  10. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  11. GRB 050721a: Optical Observations
  12. GRB 050709: Refined Spectral and Temporal Properties
  13. GRB 050717: PROMPT RcIc Observations
  14. GRB 050714a: Refined XRT analysis and afterglow confirmation
  15. Swift-BAT trigger 146731 is not a real GRB
  16. GRB 050712, Tautenburg optical afterglow observations
  17. Swift-BAT detection of a possible GRB
  18. GRB 050714B: VLT R-band observations
  19. GRB 050717: Additional LCO observations
  20. GRB050717
  21. GRB 050716; J-band observations
  22. Konus-Wind observation of GRB 050717
  23. GRB 050717: LCO near-IR observations
  24. Swift/UVOT Observations of GRB 050717
  25. GRB 050717: Swift-BAT refined analysis
  26. GRB 050717: Refined XRT analysis.
  27. GRB050712: optical limits
  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. GRB 050716: Lulin B and R band optical observations
  33. GRB050716, optical observation
  34. GRB 050716: Optical Observations
  35. GRB050716: Faulkes North Telescope observation
  36. Swift/BAT detection of GRB 050716
  37. GRB 050715: Swift-BAT detection
  38. Swift UVOT Observations of GRB 050714B
  39. Konus-Wind observation of GRB 050713A
  40. GRB 050714B: refined XRT analysis
  41. GRB 050713b: RTT150 optical observations
  42. GRB 050714B: candidate afterglow does not fade
  43. GRB050714B: Refined analysis of the Swift-BAT burst
  44. GRB 050714B: optical afterglow
  45. Swift detection of a long transient (GRB 050714B?)
  46. GRB 050709: optical afterglow candidate
  47. GRB 050714, R-band candidate
  48. GRB 050714: Swift XRT afterglow position
  49. GRB 050714, optical observations
  50. GRB 050714A: ROTSE-III Optical Limits
  51. GRB 050714 - A long GRB detected with INTEGRAL
  52. GRB 050713A: XRT refined analysis
  53. GRB 050709: Spectroscopy
  54. GRB 050713A: RAPTOR detection of early optical emission
  55. GRB050713B :Swift/UVOT observations
  56. GRB050712: TNG R-band observations
  57. GRB 050713B: Swift-BAT Refined Analysis
  58. Swift-BAT Trigger 145729 is not a GRB
  59. GRB 050713A: Swift/UVOT observation
  60. GRB 050713A : Swift-BAT Refined Analysis
  61. GRB 050713A : Lulin R-band observation
  62. GRB 050713A XMM-Newton observation
  63. GRB 050713b : Lulin R-band observations
  64. GRB050713B: Faulkes North Telescope observation
  65. RBO RI observations of GRB 050713A
  66. GRB 050713B
  67. GRB050709 : Chandra source optical counterpart
  68. GRB050713: Liverpool Telescope prompt observations
  69. GRB 050712, optical observations
  70. GRB 050713 : Planned XMM-Newton observation
  71. GRB050709: Candidate X-ray Afterglow from Chandra
  72. GRB 050713, R-band observations at NOT
  73. GRB 050713: ARC NIR Detections and Identification of Fading
  74. GRB050713: possible I-band afterglow
  75. GRB 050713: Swift detection of Bright Burst
  76. GRB 050713A: ROTSE-III Optical Limits
  77. GRB 050709: Swift UVOT and XRT observations
  78. GRB 050712: Swift-BAT Refined Analysis
  79. GRB 050712: Swift XRT afterglow position
  80. GRB 050712: Swift detection of a weak burst
  81. GRB 050709: LCO40 Observations
  82. GRB050709: A Possible Short-Hard GRB Localized by HETE
  83. PROMPT Rc Observations of GRB 050709
  84. GRB 050525a: PROMPT VRcIc Detections
  85. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  86. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  87. GRB 050626 optical observations
  88. GRB 050626: Swift XRT observations
  89. GRB 050701
  90. GRB 050701, optical observations
  91. GRB 050408: ARC 3.5-meter NIR Observations
  92. GRB 050701: Refined XRT analysis
  93. Swift UVOT observations of GRB 050701
  94. GRB 050701: Swift XRT afterglow position
  95. Swift trigger 143708 is really GRB 050701
  96. GRB 050607, radio observations
  97. GRB 050626 - Correction to GCN 3552
  98. GRB 050626 - a long GRB detected with INTEGRAL
  99. GRB 050525A: Swift Late-Time Decay Rate
  100. H3804: A Possible New XRB Detected by HETE

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