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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"
  1. GRB050730: Swift-BAT detection of a weak burst
  2. GRB 050713A: Swift XRT extended light curve
  3. GRB 050709: PROMPT Rc Observations
  4. GRB050713b: Maidanak optical observations
  5. GRB 050724: Secure Host Redshift from Keck
  6. GRB 050724: WHT optical observations
  7. GRB050726: Swift UVOT observations
  8. GRB 050724: Chandra Observations of the X-ray Afterglow
  9. GRB050724: Refined Radio Position
  10. GRB050713: analysis of the XMM-Newton observation
  11. GRB 050724, SMARTS optical/IR afterglow observations
  12. GRB 050726, SMARTS optical/IR observations
  13. Swift-BAT trigger 147918 is not a real GRB
  14. GRB 050727: RTT150 optical observations
  15. GRB050724: VLT observations of the variable source
  16. GRB050727: KAIT optical limit
  17. GRB050709: Second Epoch Chandra Observation
  18. GRB 050726: PROMPT Rc Observations
  19. GRB050709: Second Epoch Chandra Observation
  20. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  21. GRB050724: Further Radio Observations
  22. GRB 050726: early Swift XRT analysis results
  23. GRB050726: Swift-BAT detection of a weak burst
  24. GRB 050724: Optical Variability in Nearby Galaxy
  25. GRB 050724: J-band observations
  26. GRB 050724: GMOS Imaging and Spectroscopy
  27. GRB 050724: SWIFT XRT refined position
  28. RXTE ASM Detection of GRB050724
  29. GRB050724: Radio Observation
  30. GRB 050724: spectroscopy of object in the XRT error circle
  31. GRB 050724: Optical limit
  32. GRB 050724: optical and near-IR observations
  33. GRB 050724: Optical imaging/astrometry
  34. GRB 050724: RTT150 optical observations
  35. GRB 050724: Swift/UVOT Upper Limit
  36. GRB 050724: early Swift XRT analysis results
  37. GRB 050724 : Lulin early R-band monitoring observations
  38. GRB050724: Refined analysis of the Swift-BAT possible short burst
  39. GRB 050724: possible host galaxy in DSS
  40. GRB050724: a short-burst detected by Swift
  41. Swift-BAT trigger 147325 is not due to a real GRB
  42. GRB050723: XRT distributed coordinates are not related to the burst
  43. GRB 050721: early afterglow light curve
  44. GRB 050721A: Swift-BAT refined analysis
  45. Correction to GCN Circ 3474 on GRB050525A
  46. GRB 050721A: Early Swift XRT analysis results
  47. GRB050721A: optical decay
  48. GRB 050721: optical afterglow confirmed
  49. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  50. GRB 050721a: Optical Observations
  51. GRB050721A: Swift-BAT detection of a weak burst
  52. GRB 050709: Refined Spectral and Temporal Properties
  53. GRB 050717: PROMPT RcIc Observations
  54. GRB050714b: Radio Observation
  55. GRB050712: Radio Observations
  56. GRB 050714a: Refined XRT analysis and afterglow confirmation
  57. GRB050713a: Radio Observation
  58. Swift-BAT trigger 146731 is not a real GRB
  59. GRB 050712, Tautenburg optical afterglow observations
  60. Swift-BAT detection of a possible GRB
  61. GRB 050714B: VLT R-band observations
  62. GRB 050717: Additional LCO observations
  63. GRB050717
  64. GRB 050716; J-band observations
  65. Konus-Wind observation of GRB 050717
  66. GRB 050717: LCO near-IR observations
  67. Swift/UVOT Observations of GRB 050717
  68. GRB 050717: Swift-BAT refined analysis
  69. GRB 050717: Refined XRT analysis.
  70. GRB050712: optical limits
  71. GRB050717: Swift XRT position
  72. Swift detection of GRB 050717
  73. GRB 050716 - UKIRT identification of candidate afterglow
  74. Swift UVOT Observations of GRB 050716
  75. GRB 050716: Refined XRT analysis.
  76. GRB050716: Refined analysis of the Swift-BAT burst
  77. GRB 050716: Lulin B and R band optical observations
  78. GRB050716, optical observation
  79. GRB 050716: Optical Observations
  80. GRB050716: Faulkes North Telescope observation
  81. GRB050716: Correction to sign in XRT coordinate
  82. Swift/BAT detection of GRB 050716
  83. GRB050715: Refined analysis of the Swift-BAT burst
  84. GRB 050715: Swift-BAT detection
  85. Swift UVOT Observations of GRB 050714B
  86. Konus-Wind observation of GRB 050713A
  87. GRB 050714B: refined XRT analysis
  88. GRB 050713b: RTT150 optical observations
  89. GRB 050714B: candidate afterglow does not fade
  90. GRB050714B: Refined analysis of the Swift-BAT burst
  91. GRB 050714B: optical afterglow
  92. Swift detection of a long transient (GRB 050714B?)
  93. GRB 050709: optical afterglow candidate
  94. GRB 050714, R-band candidate
  95. GRB 050714: Swift XRT afterglow position
  96. GRB 050714, optical observations
  97. GRB 050714A: ROTSE-III Optical Limits
  98. GRB 050714 - A long GRB detected with INTEGRAL
  99. GRB 050713A: XRT refined analysis
  100. GRB 050709: Spectroscopy

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