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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"

43000 results found.

  1. GRB 050726: PROMPT Rc Observations
  2. GRB050709: Second Epoch Chandra Observation
  3. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  4. GRB050724: Further Radio Observations
  5. GRB 050726: early Swift XRT analysis results
  6. GRB050726: Swift-BAT detection of a weak burst
  7. GRB 050724: Optical Variability in Nearby Galaxy
  8. GRB 050724: GMOS Imaging and Spectroscopy
  9. GRB 050724: SWIFT XRT refined position
  10. RXTE ASM Detection of GRB050724
  11. GRB050724: Radio Observation
  12. GRB 050724: spectroscopy of object in the XRT error circle
  13. GRB 050724: Optical limit
  14. GRB 050724: optical and near-IR observations
  15. GRB 050724: Optical imaging/astrometry
  16. GRB 050724: RTT150 optical observations
  17. GRB 050724: Swift/UVOT Upper Limit
  18. GRB 050724: early Swift XRT analysis results
  19. GRB050724: Refined analysis of the Swift-BAT possible short burst
  20. GRB 050724: possible host galaxy in DSS
  21. GRB050724: a short-burst detected by Swift
  22. GRB 050721: early afterglow light curve
  23. GRB 050721A: Swift-BAT refined analysis
  24. Correction to GCN Circ 3474 on GRB050525A
  25. GRB 050721A: Early Swift XRT analysis results
  26. GRB050721A: optical decay
  27. GRB 050721: optical afterglow confirmed
  28. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  29. GRB 050721a: Optical Observations
  30. GRB050721A: Swift-BAT detection of a weak burst
  31. GRB 050709: Refined Spectral and Temporal Properties
  32. GRB 050717: PROMPT RcIc Observations
  33. GRB050712: Radio Observations
  34. GRB 050714a: Refined XRT analysis and afterglow confirmation
  35. Swift-BAT detection of a possible GRB
  36. GRB 050714B: VLT R-band observations
  37. GRB 050717: Additional LCO observations
  38. GRB050717
  39. Konus-Wind observation of GRB 050717
  40. GRB 050717: LCO near-IR observations
  41. Swift/UVOT Observations of GRB 050717
  42. GRB 050717: Swift-BAT refined analysis
  43. GRB 050717: Refined XRT analysis.
  44. GRB050712: optical limits
  45. GRB050717: Swift XRT position
  46. Swift detection of GRB 050717
  47. GRB 050716 - UKIRT identification of candidate afterglow
  48. Swift UVOT Observations of GRB 050716
  49. GRB 050716: Refined XRT analysis.
  50. GRB050716: Refined analysis of the Swift-BAT burst
  51. GRB 050716: Lulin B and R band optical observations
  52. GRB 050716: Optical Observations
  53. GRB050716: Correction to sign in XRT coordinate
  54. Swift/BAT detection of GRB 050716
  55. GRB 050715: Swift-BAT detection
  56. Konus-Wind observation of GRB 050713A
  57. GRB 050714B: refined XRT analysis
  58. GRB 050713b: RTT150 optical observations
  59. GRB 050714B: candidate afterglow does not fade
  60. GRB050714B: Refined analysis of the Swift-BAT burst
  61. Swift detection of a long transient (GRB 050714B?)
  62. GRB 050709: optical afterglow candidate
  63. GRB 050714, R-band candidate
  64. GRB 050714: Swift XRT afterglow position
  65. GRB 050714, optical observations
  66. GRB 050714A: ROTSE-III Optical Limits
  67. GRB 050714 - A long GRB detected with INTEGRAL
  68. GRB 050713A: XRT refined analysis
  69. GRB 050709: Spectroscopy
  70. GRB 050713A: RAPTOR detection of early optical emission
  71. GRB050713B :Swift/UVOT observations
  72. GRB050713b: XRT refined analysis
  73. GRB050712: TNG R-band observations
  74. GRB 050713B: Swift-BAT Refined Analysis
  75. Swift-BAT Trigger 145729 is not a GRB
  76. GRB 050713A: Swift/UVOT observation
  77. GRB 050713A : Swift-BAT Refined Analysis
  78. GRB050712: Swift UVOT Observation of Afterglow Emission
  79. GRB 050713A : Lulin R-band observation
  80. GRB 050713A XMM-Newton observation
  81. RBO RI observations of GRB 050713A
  82. GRB 050713B
  83. GRB050709 : Chandra source optical counterpart
  84. GRB050713: Liverpool Telescope prompt observations
  85. GRB 050712, optical observations
  86. GRB050709: Candidate X-ray Afterglow from Chandra
  87. GRB 050713, R-band observations at NOT
  88. GRB 050713: ARC NIR Detections and Identification of Fading
  89. GRB 050713: Swift detection of Bright Burst
  90. GRB 050713A: ROTSE-III Optical Limits
  91. GRB050712: XRT refined analysis
  92. GRB050709: Radio Observations
  93. GRB 050709: Swift UVOT and XRT observations
  94. GRB 050712: Swift-BAT Refined Analysis
  95. GRB050712: UVOT candidate optical counterpart
  96. GRB 050712: Swift XRT afterglow position
  97. GRB 050712: Swift detection of a weak burst
  98. GRB 050709: LCO40 Observations
  99. GRB050709, optical observations
  100. GRB050709: A Possible Short-Hard GRB Localized by HETE

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