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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').

18292 results found.

  1. GRB 050803: Swift-BAT refined analysis
  2. GRB050803: MASTER further analys
  3. GRB 050803: early Swift XRT analysis results
  4. GRB 050803: TAROT optical limits
  5. GRB050803: MASTER optical observations
  6. GRB050803: Swift-BAT detection of a very long burst
  7. GCN GRB observation 050713A
  8. GRB 050802: Swift/UVOT optical and UV detections
  9. GRB050802 radio non-detection
  10. GRB 050730: OHP optical observations
  11. GRB 050802: early Swift XRT analysis results
  12. GRB 050802: Swift/UVOT observations
  13. GRB 050802: Swift-BAT refined analysis
  14. GRB 050802: XRT position
  15. GRB 050802: Swift Gamma-ray Burst
  16. GRB050801: Swift/UVOT Optical and UV detections
  17. GCN 050801: early Swift XRT analysis results
  18. GRB 050801: Swift-BAT refined analysis
  19. GRB 050801, afterglow observations
  20. GRB 050730, corrected photometry and break?
  21. GRB 050801: ROTSE-III Early Afterglow Break
  22. GRB050801: Swift-BAT detection of a burst
  23. GRB050801: GCN XRT position is incorrect
  24. GRB 050801: ROTSE-III Detection of Possible Counterpart
  25. GRB 050730: XRT refined analysis
  26. GRB 050730: early TAROT optical observations
  27. Swift/UVOT photometry of GRB050730
  28. GRB050730: Refined BAT analysis of the Swift-BAT burst
  29. GRB 050730: Swift XRT afterglow observations
  30. GRB 050730 XMM-Newton observation
  31. GRB050730, afterglow observations
  32. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  33. GRB050730: Liverpool Telescope optical observations
  34. GRB 050730, optical candidate
  35. GRB050730: Swift-BAT detection of a weak burst
  36. GRB 050713A: Swift XRT extended light curve
  37. GRB050726: Swift UVOT observations
  38. GRB 050724: Chandra Observations of the X-ray Afterglow
  39. GRB050713: analysis of the XMM-Newton observation
  40. Swift-BAT trigger 147918 is not a real GRB
  41. GRB 050727: RTT150 optical observations
  42. GRB050727: KAIT optical limit
  43. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  44. GRB 050726: early Swift XRT analysis results
  45. GRB050726: Swift-BAT detection of a weak burst
  46. GRB 050724: SWIFT XRT refined position
  47. GRB 050724: optical and near-IR observations
  48. GRB 050724: Swift/UVOT Upper Limit
  49. GRB 050724: early Swift XRT analysis results
  50. GRB050724: Refined analysis of the Swift-BAT possible short burst
  51. GRB050724: a short-burst detected by Swift
  52. Swift-BAT trigger 147325 is not due to a real GRB
  53. GRB050723: XRT distributed coordinates are not related to the burst
  54. GRB 050721A: Swift-BAT refined analysis
  55. GRB 050721A: Early Swift XRT analysis results
  56. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  57. GRB 050721a: Optical Observations
  58. GRB050721A: Swift-BAT detection of a weak burst
  59. GRB 050714a: Refined XRT analysis and afterglow confirmation
  60. Swift-BAT trigger 146731 is not a real GRB
  61. Swift-BAT detection of a possible GRB
  62. GRB050717
  63. Konus-Wind observation of GRB 050717
  64. Swift/UVOT Observations of GRB 050717
  65. GRB 050717: Swift-BAT refined analysis
  66. GRB 050717: Refined XRT analysis.
  67. GRB050712: optical limits
  68. GRB050717: Swift XRT position
  69. Swift detection of GRB 050717
  70. GRB 050716 - UKIRT identification of candidate afterglow
  71. Swift UVOT Observations of GRB 050716
  72. GRB 050716: Refined XRT analysis.
  73. GRB050716: Refined analysis of the Swift-BAT burst
  74. GRB050716, optical observation
  75. GRB050716: Faulkes North Telescope observation
  76. GRB050716: Correction to sign in XRT coordinate
  77. Swift/BAT detection of GRB 050716
  78. GRB050715: Refined analysis of the Swift-BAT burst
  79. GRB 050715: Swift-BAT detection
  80. Swift UVOT Observations of GRB 050714B
  81. Konus-Wind observation of GRB 050713A
  82. GRB 050714B: refined XRT analysis
  83. GRB050714B: Refined analysis of the Swift-BAT burst
  84. Swift detection of a long transient (GRB 050714B?)
  85. GRB 050714: Swift XRT afterglow position
  86. GRB 050713A: XRT refined analysis
  87. GRB 050713A: RAPTOR detection of early optical emission
  88. GRB050713B :Swift/UVOT observations
  89. GRB050713b: XRT refined analysis
  90. GRB 050713B: Swift-BAT Refined Analysis
  91. Swift-BAT Trigger 145729 is not a GRB
  92. GRB 050713A: Swift/UVOT observation
  93. GRB 050713A : Swift-BAT Refined Analysis
  94. GRB050712: Swift UVOT Observation of Afterglow Emission
  95. GRB 050713A XMM-Newton observation
  96. GRB050713B: Faulkes North Telescope observation
  97. RBO RI observations of GRB 050713A
  98. GRB 050713B
  99. GRB050713: Liverpool Telescope prompt observations
  100. GRB050709: Candidate X-ray Afterglow from Chandra

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