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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').

18188 results found.

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

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