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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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').

18174 results found.

  1. GRB 050801, afterglow observations
  2. GRB 050730, corrected photometry and break?
  3. GRB 050801: ROTSE-III Early Afterglow Break
  4. GRB050801: Swift-BAT detection of a burst
  5. GRB050801: GCN XRT position is incorrect
  6. GRB 050801: ROTSE-III Detection of Possible Counterpart
  7. GRB 050730: XRT refined analysis
  8. GRB 050730: early TAROT optical observations
  9. Swift/UVOT photometry of GRB050730
  10. GRB050730: Refined BAT analysis of the Swift-BAT burst
  11. GRB 050730: Swift XRT afterglow observations
  12. GRB 050730 XMM-Newton observation
  13. GRB050730, afterglow observations
  14. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  15. GRB050730: Liverpool Telescope optical observations
  16. GRB 050730, optical candidate
  17. GRB050730: Swift-BAT detection of a weak burst
  18. GRB 050713A: Swift XRT extended light curve
  19. GRB050726: Swift UVOT observations
  20. GRB 050724: Chandra Observations of the X-ray Afterglow
  21. GRB050713: analysis of the XMM-Newton observation
  22. Swift-BAT trigger 147918 is not a real GRB
  23. GRB 050727: RTT150 optical observations
  24. GRB050727: KAIT optical limit
  25. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  26. GRB 050726: early Swift XRT analysis results
  27. GRB050726: Swift-BAT detection of a weak burst
  28. GRB 050724: SWIFT XRT refined position
  29. GRB 050724: optical and near-IR observations
  30. GRB 050724: Swift/UVOT Upper Limit
  31. GRB 050724: early Swift XRT analysis results
  32. GRB050724: Refined analysis of the Swift-BAT possible short burst
  33. GRB050724: a short-burst detected by Swift
  34. Swift-BAT trigger 147325 is not due to a real GRB
  35. GRB050723: XRT distributed coordinates are not related to the burst
  36. GRB 050721A: Swift-BAT refined analysis
  37. GRB 050721A: Early Swift XRT analysis results
  38. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  39. GRB 050721a: Optical Observations
  40. GRB050721A: Swift-BAT detection of a weak burst
  41. GRB 050714a: Refined XRT analysis and afterglow confirmation
  42. Swift-BAT trigger 146731 is not a real GRB
  43. Swift-BAT detection of a possible GRB
  44. GRB050717
  45. Konus-Wind observation of GRB 050717
  46. Swift/UVOT Observations of GRB 050717
  47. GRB 050717: Swift-BAT refined analysis
  48. GRB 050717: Refined XRT analysis.
  49. GRB050712: optical limits
  50. GRB050717: Swift XRT position
  51. Swift detection of GRB 050717
  52. GRB 050716 - UKIRT identification of candidate afterglow
  53. Swift UVOT Observations of GRB 050716
  54. GRB 050716: Refined XRT analysis.
  55. GRB050716: Refined analysis of the Swift-BAT burst
  56. GRB050716, optical observation
  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. GRB 050715: Swift-BAT detection
  62. Swift UVOT Observations of GRB 050714B
  63. Konus-Wind observation of GRB 050713A
  64. GRB 050714B: refined XRT analysis
  65. GRB050714B: Refined analysis of the Swift-BAT burst
  66. Swift detection of a long transient (GRB 050714B?)
  67. GRB 050714: Swift XRT afterglow position
  68. GRB 050713A: XRT refined analysis
  69. GRB 050713A: RAPTOR detection of early optical emission
  70. GRB050713B :Swift/UVOT observations
  71. GRB050713b: XRT refined analysis
  72. GRB 050713B: Swift-BAT Refined Analysis
  73. Swift-BAT Trigger 145729 is not a GRB
  74. GRB 050713A: Swift/UVOT observation
  75. GRB 050713A : Swift-BAT Refined Analysis
  76. GRB050712: Swift UVOT Observation of Afterglow Emission
  77. GRB 050713A XMM-Newton observation
  78. GRB050713B: Faulkes North Telescope observation
  79. RBO RI observations of GRB 050713A
  80. GRB 050713B
  81. GRB050713: Liverpool Telescope prompt observations
  82. GRB050709: Candidate X-ray Afterglow from Chandra
  83. GRB 050713, R-band observations at NOT
  84. GRB 050713: Swift detection of Bright Burst
  85. GRB 050713A: ROTSE-III Optical Limits
  86. GRB050712: XRT refined analysis
  87. GRB 050709: Swift UVOT and XRT observations
  88. GRB 050712: Swift-BAT Refined Analysis
  89. GRB050712: UVOT candidate optical counterpart
  90. GRB 050712: Swift XRT afterglow position
  91. GRB 050712: Swift detection of a weak burst
  92. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  93. GRB 050626: Swift XRT observations
  94. GRB 050701
  95. GRB 050701, optical observations
  96. GRB 050701: Refined XRT analysis
  97. Swift UVOT observations of GRB 050701
  98. GRB050701: Swift-BAT Refined analysis
  99. GRB 050701: Swift XRT afterglow position
  100. Swift trigger 143708 is really GRB 050701

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