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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"

23693 results found.

  1. GRB050730: Liverpool Telescope optical observations
  2. GRB 050730, optical candidate
  3. GRB 050713A: Swift XRT extended light curve
  4. GRB050713b: Maidanak optical observations
  5. GRB 050724: Secure Host Redshift from Keck
  6. GRB050726: Swift UVOT observations
  7. GRB 050724: Chandra Observations of the X-ray Afterglow
  8. GRB050724: Refined Radio Position
  9. Swift-BAT trigger 147918 is not a real GRB
  10. GRB 050727: RTT150 optical observations
  11. GRB050727: KAIT optical limit
  12. GRB 050726: PROMPT Rc Observations
  13. GRB050709: Second Epoch Chandra Observation
  14. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  15. GRB050724: Further Radio Observations
  16. GRB 050726: early Swift XRT analysis results
  17. GRB050726: Swift-BAT detection of a weak burst
  18. GRB 050724: Optical Variability in Nearby Galaxy
  19. GRB 050724: J-band observations
  20. GRB 050724: optical and near-IR observations
  21. GRB 050724: RTT150 optical observations
  22. GRB 050724: Swift/UVOT Upper Limit
  23. GRB 050724: early Swift XRT analysis results
  24. GRB 050724 : Lulin early R-band monitoring observations
  25. GRB050724: a short-burst detected by Swift
  26. GRB050723: XRT distributed coordinates are not related to the burst
  27. GRB 050721A: Swift-BAT refined analysis
  28. GRB 050721A: Early Swift XRT analysis results
  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. Swift-BAT detection of a possible GRB
  34. GRB 050717: Additional LCO observations
  35. GRB050717
  36. GRB 050716; J-band observations
  37. Konus-Wind observation of GRB 050717
  38. GRB 050717: LCO near-IR observations
  39. GRB 050717: Swift-BAT refined analysis
  40. GRB 050717: Refined XRT analysis.
  41. GRB050717: Swift XRT position
  42. GRB 050716 - UKIRT identification of candidate afterglow
  43. GRB 050716: Refined XRT analysis.
  44. GRB050716: Refined analysis of the Swift-BAT burst
  45. GRB 050716: Lulin B and R band optical observations
  46. GRB050716: Faulkes North Telescope observation
  47. GRB050716: Correction to sign in XRT coordinate
  48. Swift/BAT detection of GRB 050716
  49. GRB050715: Refined analysis of the Swift-BAT burst
  50. Swift UVOT Observations of GRB 050714B
  51. Konus-Wind observation of GRB 050713A
  52. GRB 050714B: refined XRT analysis
  53. GRB 050713b: RTT150 optical observations
  54. Swift detection of a long transient (GRB 050714B?)
  55. GRB 050709: optical afterglow candidate
  56. GRB 050714 - A long GRB detected with INTEGRAL
  57. GRB 050713A: XRT refined analysis
  58. GRB 050709: Spectroscopy
  59. GRB050713B :Swift/UVOT observations
  60. GRB050713b: XRT refined analysis
  61. GRB050712: TNG R-band observations
  62. GRB 050713B: Swift-BAT Refined Analysis
  63. GRB 050713A : Swift-BAT Refined Analysis
  64. GRB050712: Swift UVOT Observation of Afterglow Emission
  65. GRB 050713A : Lulin R-band observation
  66. GRB 050713A XMM-Newton observation
  67. GRB 050713b : Lulin R-band observations
  68. GRB050713B: Faulkes North Telescope observation
  69. GRB 050713B
  70. GRB050709 : Chandra source optical counterpart
  71. GRB050713: Liverpool Telescope prompt observations
  72. GRB 050713, R-band observations at NOT
  73. GRB050713: possible I-band afterglow
  74. GRB 050713: Swift detection of Bright Burst
  75. GRB050712: XRT refined analysis
  76. GRB 050709: Swift UVOT and XRT observations
  77. GRB 050712: Swift-BAT Refined Analysis
  78. GRB 050712: Swift XRT afterglow position
  79. GRB050709: A Possible Short-Hard GRB Localized by HETE
  80. PROMPT Rc Observations of GRB 050709
  81. GRB 050525a: PROMPT VRcIc Detections
  82. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  83. GRB 050626 optical observations
  84. GRB 050701
  85. GRB 050701, optical observations
  86. GRB 050701: Refined XRT analysis
  87. Swift UVOT observations of GRB 050701
  88. GRB050701: Swift-BAT Refined analysis
  89. GRB 050701: Swift XRT afterglow position
  90. Swift trigger 143708 is really GRB 050701
  91. GRB 050607, radio observations
  92. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  93. GRB 050626 - a long GRB detected with INTEGRAL
  94. GRB 050525A: Swift Late-Time Decay Rate
  95. GRB050525a: HST Observations
  96. H3804: A Possible New XRB Detected by HETE
  97. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  98. XRF 050509c: Optical monitoring
  99. Konus-Wind observation of an intermediate burst from SGR 1806-20
  100. XRF050509c: Radio Detection

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