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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').
  1. GRB 060904B BOOTES-IR and 1.5m OSN observations
  2. GRB 060904B: TAROT optical counterpart observations
  3. GRB060904B - SDSS Pre-Burst Observations
  4. GRB 060904: TAROT optical observations
  5. GRB 060904B: Swift detection of a burst with optical counterpart
  6. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  7. GRB060904 - SDSS Pre-Burst Observations
  8. GRB 060904: Swift detection of a bright burst
  9. GRB060901: Optical observations
  10. 060901: Swift UVOT followup observations
  11. GRB 060901: pseudo-z from spectral parameters of the prompt
  12. Konus-Wind observation of GRB 060901
  13. GRB 060901: SMARTS optical/IR observations update
  14. GRB 060901: Swift/XRT Refined Analysis
  15. GRB 060901: SMARTS optical/IR observations
  16. GRB 060901: Swift/XRT Position
  17. GRB 060901: further INTEGRAL results
  18. GRB 060901: Watcher observations
  19. GRB 060901: a long GRB detected by INTEGRAL
  20. Two bright bursts from SGR 1806-20 detected with IBAS
  21. GRB 060605, observations using an Integral Field Unit
  22. GRB 060604: VLA Observation
  23. GRB 060814: Suzaku/WAM observation of the prompt emission
  24. GRB 060605: VLA Observation
  25. GRB 060707: VLA observation
  26. GRB 060825: VLA observations
  27. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  28. Swift-BAT trigger 226614 is not a GRB
  29. GRB060826 - SDSS Pre-Burst Observations
  30. GRB 060826(?): Swift detection of a possible burst
  31. GRB 060825: XRT Team Refined Analysis
  32. GRB 060825: Swift-BAT Refined Analysis
  33. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  34. GRB060825: Liverpool Telescope optical observations
  35. GRB 060825: TNG optical observations
  36. GRB 060825: TAROT optical observations
  37. GRB 060825: P60 Observations
  38. GRB060825: BOOTES-IR optical observations
  39. GRB 060825: Swift detection of a burst
  40. GRB060801: host galaxy redshift
  41. GRB060729: analysis of XMM-Newton observation
  42. GRB 060814: pseudo-z from spectral parameters of the prompt
  43. IBAS Alerts No 3429 and 3430: not GRBs
  44. Radio observations of GRB 060719
  45. GRB 060729, SMARTS optical/IR observations
  46. GRB060814: Break in the XRT light curve
  47. GRB060813: Break in the XRT light curve
  48. GRB 060813: A long, bright GRB detected with Suzaku WAM
  49. GRB 060814: Confirmation of IR afterglow
  50. Konus-Wind observation of GRB 060814
  51. GRB 060814: Refined analysis of the Swift-BAT burst
  52. GRB 060814: P60 Observations
  53. GRB 060814: P200 NIR Observations
  54. GRB 060814: source inside revised XRT error box
  55. GRB 060814: Possible IR counterpart
  56. GRB060805B: optical observations
  57. GRB060814: Swift/UVOT upper limits
  58. GRB 060813: pseudo-z from spectral parameters of the prompt
  59. GRB 060814: Swift XRT refined analysis
  60. GRB 060814: VLT optical limits
  61. GRB 060814 - SDSS Pre-Burst Observations
  62. GRB 060814: TAROT optical observations
  63. GRB 060814: Swift detection of a bright burst
  64. Konus-Wind observation of GRB 060813
  65. GRB060813: Swift/UVOT upper limits
  66. GRB 060813: Swift XRT refined analysis
  67. GRB 060813: Refined analysis of the Swift-BAT burst
  68. GRB 060813: Swift detection of a burst
  69. GRB051109B: Late-time Radio Observations
  70. Image of the dust-scattering halo around SGR 1806-20
  71. Second VLA limit on new radio point source in SGR 1806-20
  72. A dust-scattering halo detected around SGR 1806-20
  73. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  74. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  75. GRB060807: Possible Highly Significant X-ray Emission Lines
  76. GRB060714: optical observations
  77. IBAS Alert n. 3422: not a GRB
  78. GRB 060729: An update on the Swift XRT and UVOT observations
  79. GRB060717: optical observations
  80. GRB060807: Optical limiting magnitudes
  81. GRB 060805B: optical observation at Sierra Nevada
  82. GRB 060805B: XRT Team Analysis
  83. VLA Upper Limit on Outburst of SGR 1806-20
  84. GRB060806 is similar to previous activity of SGR1806-20
  85. GRB 060807: UVOT Upper limits
  86. GRB 060807: afterglow confirmation
  87. GRB 060807: XRT Team refined analysis
  88. GRB 060807: K- and R-band observations
  89. GRB 060807: Refined analysis of the Swift-BAT burst
  90. GRB060807: optical afterglow candidate
  91. GRB060806 = SGR1806-20
  92. GRB 060805B: RHESSI Spectral Fit
  93. GRB060807: optical upper limit in white light
  94. IPN triangulation of GRB060806 (long, exceptionally bright)
  95. GRB060807 - SDSS Pre-burst Observations
  96. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  97. GRB 060805B: Swift/UVOT Upper Limits
  98. GRB 060807, optical observation
  99. GRB 060807: Kanazawa R-band observation
  100. GRB 060807: optical limit

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