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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"

23704 results found.

  1. GRB 050730, corrected photometry and break?
  2. GRB050801: Swift-BAT detection of a burst
  3. GRB 050730: XRT refined analysis
  4. GRB 050730: early TAROT optical observations
  5. GRB 050730: RTT150 optical observations
  6. GRB 050730, spectra and optical photometry
  7. GRB050730: Refined BAT analysis of the Swift-BAT burst
  8. GRB 050730: Swift XRT afterglow observations
  9. GRB 050730 XMM-Newton observation
  10. GRB 050730: PROMPT VRcIc Observations
  11. GRB050730: confirmation of redshift
  12. GRB050730: Liverpool Telescope optical observations
  13. GRB 050730, optical candidate
  14. GRB 050713A: Swift XRT extended light curve
  15. GRB050713b: Maidanak optical observations
  16. GRB 050724: Secure Host Redshift from Keck
  17. GRB050726: Swift UVOT observations
  18. GRB 050724: Chandra Observations of the X-ray Afterglow
  19. GRB050724: Refined Radio Position
  20. Swift-BAT trigger 147918 is not a real GRB
  21. GRB 050727: RTT150 optical observations
  22. GRB050727: KAIT optical limit
  23. GRB 050726: PROMPT Rc Observations
  24. GRB050709: Second Epoch Chandra Observation
  25. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  26. GRB050724: Further Radio Observations
  27. GRB 050726: early Swift XRT analysis results
  28. GRB050726: Swift-BAT detection of a weak burst
  29. GRB 050724: Optical Variability in Nearby Galaxy
  30. GRB 050724: J-band observations
  31. GRB 050724: optical and near-IR observations
  32. GRB 050724: RTT150 optical observations
  33. GRB 050724: Swift/UVOT Upper Limit
  34. GRB 050724: early Swift XRT analysis results
  35. GRB 050724 : Lulin early R-band monitoring observations
  36. GRB050724: a short-burst detected by Swift
  37. GRB050723: XRT distributed coordinates are not related to the burst
  38. GRB 050721A: Swift-BAT refined analysis
  39. GRB 050721A: Early Swift XRT analysis results
  40. GRB 050721a: Optical Observations
  41. GRB050721A: Swift-BAT detection of a weak burst
  42. GRB 050709: Refined Spectral and Temporal Properties
  43. GRB 050717: PROMPT RcIc Observations
  44. Swift-BAT detection of a possible GRB
  45. GRB 050717: Additional LCO observations
  46. GRB050717
  47. GRB 050716; J-band observations
  48. Konus-Wind observation of GRB 050717
  49. GRB 050717: LCO near-IR observations
  50. GRB 050717: Swift-BAT refined analysis
  51. GRB 050717: Refined XRT analysis.
  52. GRB050717: Swift XRT position
  53. GRB 050716 - UKIRT identification of candidate afterglow
  54. GRB 050716: Refined XRT analysis.
  55. GRB050716: Refined analysis of the Swift-BAT burst
  56. GRB 050716: Lulin B and R band optical observations
  57. GRB050716: Faulkes North Telescope observation
  58. GRB050716: Correction to sign in XRT coordinate
  59. Swift/BAT detection of GRB 050716
  60. GRB050715: Refined analysis of the Swift-BAT burst
  61. Swift UVOT Observations of GRB 050714B
  62. Konus-Wind observation of GRB 050713A
  63. GRB 050714B: refined XRT analysis
  64. GRB 050713b: RTT150 optical observations
  65. Swift detection of a long transient (GRB 050714B?)
  66. GRB 050709: optical afterglow candidate
  67. GRB 050714 - A long GRB detected with INTEGRAL
  68. GRB 050713A: XRT refined analysis
  69. GRB 050709: Spectroscopy
  70. GRB050713B :Swift/UVOT observations
  71. GRB050713b: XRT refined analysis
  72. GRB050712: TNG R-band observations
  73. GRB 050713B: Swift-BAT Refined Analysis
  74. GRB 050713A : Swift-BAT Refined Analysis
  75. GRB050712: Swift UVOT Observation of Afterglow Emission
  76. GRB 050713A : Lulin R-band observation
  77. GRB 050713A XMM-Newton observation
  78. GRB 050713b : Lulin R-band observations
  79. GRB050713B: Faulkes North Telescope observation
  80. GRB 050713B
  81. GRB050709 : Chandra source optical counterpart
  82. GRB050713: Liverpool Telescope prompt observations
  83. GRB 050713, R-band observations at NOT
  84. GRB050713: possible I-band afterglow
  85. GRB 050713: Swift detection of Bright Burst
  86. GRB050712: XRT refined analysis
  87. GRB 050709: Swift UVOT and XRT observations
  88. GRB 050712: Swift-BAT Refined Analysis
  89. GRB 050712: Swift XRT afterglow position
  90. GRB050709: A Possible Short-Hard GRB Localized by HETE
  91. PROMPT Rc Observations of GRB 050709
  92. GRB 050525a: PROMPT VRcIc Detections
  93. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  94. GRB 050626 optical observations
  95. GRB 050701
  96. GRB 050701, optical observations
  97. GRB 050701: Refined XRT analysis
  98. Swift UVOT observations of GRB 050701
  99. GRB050701: Swift-BAT Refined analysis
  100. GRB 050701: Swift XRT afterglow position

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