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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"

25907 results found.

  1. GRB 050726, SMARTS optical/IR observations
  2. Swift-BAT trigger 147918 is not a real GRB
  3. GRB 050727: RTT150 optical observations
  4. GRB050724: VLT observations of the variable source
  5. GRB050727: KAIT optical limit
  6. GRB050709: Second Epoch Chandra Observation
  7. GRB 050726: PROMPT Rc Observations
  8. GRB050709: Second Epoch Chandra Observation
  9. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  10. GRB050724: Further Radio Observations
  11. GRB 050726: early Swift XRT analysis results
  12. GRB050726: Swift-BAT detection of a weak burst
  13. GRB 050724: J-band observations
  14. GRB 050724: GMOS Imaging and Spectroscopy
  15. GRB 050724: SWIFT XRT refined position
  16. GRB050724: Radio Observation
  17. GRB 050724: spectroscopy of object in the XRT error circle
  18. GRB 050724: Optical limit
  19. GRB 050724: optical and near-IR observations
  20. GRB 050724: Optical imaging/astrometry
  21. GRB 050724: Swift/UVOT Upper Limit
  22. GRB 050724: early Swift XRT analysis results
  23. GRB050724: Refined analysis of the Swift-BAT possible short burst
  24. GRB 050724: possible host galaxy in DSS
  25. GRB050724: a short-burst detected by Swift
  26. Swift-BAT trigger 147325 is not due to a real GRB
  27. GRB050723: XRT distributed coordinates are not related to the burst
  28. GRB 050721: early afterglow light curve
  29. GRB 050721A: Swift-BAT refined analysis
  30. GRB 050721A: Early Swift XRT analysis results
  31. GRB050721A: optical decay
  32. GRB 050721: optical afterglow confirmed
  33. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  34. GRB 050721a: Optical Observations
  35. GRB050721A: Swift-BAT detection of a weak burst
  36. GRB 050717: PROMPT RcIc Observations
  37. GRB050714b: Radio Observation
  38. GRB 050714a: Refined XRT analysis and afterglow confirmation
  39. Swift-BAT trigger 146731 is not a real GRB
  40. GRB 050712, Tautenburg optical afterglow observations
  41. Swift-BAT detection of a possible GRB
  42. GRB 050714B: VLT R-band observations
  43. GRB 050717: Additional LCO observations
  44. GRB050717
  45. GRB 050716; J-band observations
  46. Konus-Wind observation of GRB 050717
  47. GRB 050717: LCO near-IR observations
  48. Swift/UVOT Observations of GRB 050717
  49. GRB 050717: Swift-BAT refined analysis
  50. GRB 050717: Refined XRT analysis.
  51. GRB050712: optical limits
  52. GRB050717: Swift XRT position
  53. Swift detection of GRB 050717
  54. GRB 050716 - UKIRT identification of candidate afterglow
  55. Swift UVOT Observations of GRB 050716
  56. GRB 050716: Refined XRT analysis.
  57. GRB050716: Refined analysis of the Swift-BAT burst
  58. GRB 050716: Lulin B and R band optical observations
  59. GRB050716, optical observation
  60. GRB 050716: Optical Observations
  61. GRB050716: Faulkes North Telescope observation
  62. GRB050716: Correction to sign in XRT coordinate
  63. Swift/BAT detection of GRB 050716
  64. GRB050715: Refined analysis of the Swift-BAT burst
  65. GRB 050715: Swift-BAT detection
  66. Swift UVOT Observations of GRB 050714B
  67. Konus-Wind observation of GRB 050713A
  68. GRB 050714B: refined XRT analysis
  69. GRB 050714B: candidate afterglow does not fade
  70. GRB050714B: Refined analysis of the Swift-BAT burst
  71. GRB 050714B: optical afterglow
  72. Swift detection of a long transient (GRB 050714B?)
  73. GRB 050709: optical afterglow candidate
  74. GRB 050714: Swift XRT afterglow position
  75. GRB 050713A: XRT refined analysis
  76. GRB 050709: Spectroscopy
  77. GRB 050713A: RAPTOR detection of early optical emission
  78. GRB050713B :Swift/UVOT observations
  79. GRB050713b: XRT refined analysis
  80. GRB050712: TNG R-band observations
  81. GRB 050713B: Swift-BAT Refined Analysis
  82. Swift-BAT Trigger 145729 is not a GRB
  83. GRB 050713A: Swift/UVOT observation
  84. GRB 050713A : Swift-BAT Refined Analysis
  85. GRB050712: Swift UVOT Observation of Afterglow Emission
  86. GRB 050713A : Lulin R-band observation
  87. GRB 050713A XMM-Newton observation
  88. GRB050713B: Faulkes North Telescope observation
  89. RBO RI observations of GRB 050713A
  90. GRB 050713B
  91. GRB050713: Liverpool Telescope prompt observations
  92. GRB050709: Candidate X-ray Afterglow from Chandra
  93. GRB 050713, R-band observations at NOT
  94. GRB050713: possible I-band afterglow
  95. GRB 050713: Swift detection of Bright Burst
  96. GRB 050713A: ROTSE-III Optical Limits
  97. GRB050712: XRT refined analysis
  98. GRB 050709: Swift UVOT and XRT observations
  99. GRB 050712: Swift-BAT Refined Analysis
  100. GRB050712: UVOT candidate optical counterpart

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