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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"

32685 results found.

  1. GRB050726: Swift UVOT observations
  2. GRB 050724: Chandra Observations of the X-ray Afterglow
  3. GRB050724: Refined Radio Position
  4. GRB050713: analysis of the XMM-Newton observation
  5. GRB 050724, SMARTS optical/IR afterglow observations
  6. GRB 050726, SMARTS optical/IR observations
  7. Swift-BAT trigger 147918 is not a real GRB
  8. GRB050724: VLT observations of the variable source
  9. GRB050709: Second Epoch Chandra Observation
  10. GRB 050726: PROMPT Rc Observations
  11. GRB050709: Second Epoch Chandra Observation
  12. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  13. GRB050724: Further Radio Observations
  14. GRB 050726: early Swift XRT analysis results
  15. GRB050726: Swift-BAT detection of a weak burst
  16. GRB 050724: Optical Variability in Nearby Galaxy
  17. GRB 050724: J-band observations
  18. GRB 050724: GMOS Imaging and Spectroscopy
  19. GRB 050724: SWIFT XRT refined position
  20. RXTE ASM Detection of GRB050724
  21. GRB050724: Radio Observation
  22. GRB 050724: spectroscopy of object in the XRT error circle
  23. GRB 050724: Optical limit
  24. GRB 050724: optical and near-IR observations
  25. GRB 050724: Optical imaging/astrometry
  26. GRB 050724: RTT150 optical observations
  27. GRB 050724: Swift/UVOT Upper Limit
  28. GRB 050724: early Swift XRT analysis results
  29. GRB 050724 : Lulin early R-band monitoring observations
  30. GRB050724: Refined analysis of the Swift-BAT possible short burst
  31. GRB 050724: possible host galaxy in DSS
  32. Swift-BAT trigger 147325 is not due to a real GRB
  33. GRB050723: XRT distributed coordinates are not related to the burst
  34. GRB 050721: early afterglow light curve
  35. GRB 050721A: Swift-BAT refined analysis
  36. Correction to GCN Circ 3474 on GRB050525A
  37. GRB 050721A: Early Swift XRT analysis results
  38. GRB050721A: optical decay
  39. GRB 050721: optical afterglow confirmed
  40. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  41. GRB 050721a: Optical Observations
  42. GRB 050709: Refined Spectral and Temporal Properties
  43. GRB 050717: PROMPT RcIc Observations
  44. GRB050714b: Radio Observation
  45. GRB050712: Radio Observations
  46. GRB 050714a: Refined XRT analysis and afterglow confirmation
  47. GRB050713a: Radio Observation
  48. Swift-BAT trigger 146731 is not a real GRB
  49. GRB 050712, Tautenburg optical afterglow observations
  50. GRB 050714B: VLT R-band observations
  51. GRB 050717: Additional LCO observations
  52. GRB050717
  53. GRB 050716; J-band observations
  54. Konus-Wind observation of GRB 050717
  55. GRB 050717: LCO near-IR observations
  56. Swift/UVOT Observations of GRB 050717
  57. GRB 050717: Swift-BAT refined analysis
  58. GRB 050717: Refined XRT analysis.
  59. GRB050712: optical limits
  60. GRB050717: Swift XRT position
  61. GRB 050716 - UKIRT identification of candidate afterglow
  62. Swift UVOT Observations of GRB 050716
  63. GRB 050716: Refined XRT analysis.
  64. GRB050716: Refined analysis of the Swift-BAT burst
  65. GRB 050716: Lulin B and R band optical observations
  66. GRB050716, optical observation
  67. GRB 050716: Optical Observations
  68. GRB050716: Faulkes North Telescope observation
  69. GRB050716: Correction to sign in XRT coordinate
  70. GRB050715: Refined analysis of the Swift-BAT burst
  71. Swift UVOT Observations of GRB 050714B
  72. Konus-Wind observation of GRB 050713A
  73. GRB 050714B: refined XRT analysis
  74. GRB 050713b: RTT150 optical observations
  75. GRB 050714B: candidate afterglow does not fade
  76. GRB050714B: Refined analysis of the Swift-BAT burst
  77. GRB 050714B: optical afterglow
  78. GRB 050709: optical afterglow candidate
  79. GRB 050714, R-band candidate
  80. GRB 050714: Swift XRT afterglow position
  81. GRB 050714, optical observations
  82. GRB 050714A: ROTSE-III Optical Limits
  83. GRB 050713A: XRT refined analysis
  84. GRB 050709: Spectroscopy
  85. GRB 050713A: RAPTOR detection of early optical emission
  86. GRB050713B :Swift/UVOT observations
  87. GRB050713b: XRT refined analysis
  88. GRB050712: TNG R-band observations
  89. GRB 050713B: Swift-BAT Refined Analysis
  90. Swift-BAT Trigger 145729 is not a GRB
  91. GRB 050713A: Swift/UVOT observation
  92. GRB 050713A : Swift-BAT Refined Analysis
  93. GRB050712: Swift UVOT Observation of Afterglow Emission
  94. GRB 050713A XMM-Newton observation
  95. GRB 050713b : Lulin R-band observations
  96. GRB050713B: Faulkes North Telescope observation
  97. RBO RI observations of GRB 050713A
  98. GRB050709 : Chandra source optical counterpart
  99. GRB050713: Liverpool Telescope prompt observations
  100. GRB 050712, optical observations

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