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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"
  1. GRB060904B - SDSS Pre-Burst Observations
  2. GRB 060904: TAROT optical observations
  3. GRB 060904B: Swift detection of a burst with optical counterpart
  4. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  5. GRB060904 - SDSS Pre-Burst Observations
  6. GRB 060904: Swift detection of a bright burst
  7. GRB060901: Optical observations
  8. 060901: Swift UVOT followup observations
  9. GRB 060901: pseudo-z from spectral parameters of the prompt
  10. Konus-Wind observation of GRB 060901
  11. GRB 060901: SMARTS optical/IR observations update
  12. GRB 060901: Swift/XRT Refined Analysis
  13. GRB 060901: SMARTS optical/IR observations
  14. GRB 060901: Swift/XRT Position
  15. GRB 060901: further INTEGRAL results
  16. GRB 060901: Watcher observations
  17. GRB 060901: a long GRB detected by INTEGRAL
  18. Two bright bursts from SGR 1806-20 detected with IBAS
  19. GRB 060605, observations using an Integral Field Unit
  20. GRB 060604: VLA Observation
  21. GRB 060814: Suzaku/WAM observation of the prompt emission
  22. GRB 060605: VLA Observation
  23. GRB 060707: VLA observation
  24. GRB 060825: VLA observations
  25. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  26. Swift-BAT trigger 226614 is not a GRB
  27. GRB060826 - SDSS Pre-Burst Observations
  28. GRB 060826(?): Swift detection of a possible burst
  29. GRB 060825: XRT Team Refined Analysis
  30. GRB 060825: Swift-BAT Refined Analysis
  31. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  32. GRB060825: Liverpool Telescope optical observations
  33. GRB 060825: TNG optical observations
  34. GRB 060825: TAROT optical observations
  35. GRB 060825: P60 Observations
  36. GRB060825: BOOTES-IR optical observations
  37. GRB 060825: Swift detection of a burst
  38. GRB060801: host galaxy redshift
  39. GRB060729: analysis of XMM-Newton observation
  40. GRB 060814: pseudo-z from spectral parameters of the prompt
  41. IBAS Alerts No 3429 and 3430: not GRBs
  42. Radio observations of GRB 060719
  43. GRB 060729, SMARTS optical/IR observations
  44. GRB060814: Break in the XRT light curve
  45. GRB060813: Break in the XRT light curve
  46. GRB 060813: A long, bright GRB detected with Suzaku WAM
  47. GRB 060814: Confirmation of IR afterglow
  48. Konus-Wind observation of GRB 060814
  49. GRB 060814: Refined analysis of the Swift-BAT burst
  50. GRB 060814: P60 Observations
  51. GRB 060814: P200 NIR Observations
  52. GRB 060814: source inside revised XRT error box
  53. GRB 060814: Possible IR counterpart
  54. GRB060805B: optical observations
  55. GRB060814: Swift/UVOT upper limits
  56. GRB 060813: pseudo-z from spectral parameters of the prompt
  57. GRB 060814: Swift XRT refined analysis
  58. GRB 060814: VLT optical limits
  59. GRB 060814 - SDSS Pre-Burst Observations
  60. GRB 060814: TAROT optical observations
  61. GRB 060814: Swift detection of a bright burst
  62. Konus-Wind observation of GRB 060813
  63. GRB060813: Swift/UVOT upper limits
  64. GRB 060813: Swift XRT refined analysis
  65. GRB 060813: Refined analysis of the Swift-BAT burst
  66. GRB 060813: Swift detection of a burst
  67. GRB051109B: Late-time Radio Observations
  68. Image of the dust-scattering halo around SGR 1806-20
  69. Second VLA limit on new radio point source in SGR 1806-20
  70. A dust-scattering halo detected around SGR 1806-20
  71. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  72. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  73. GRB060807: Possible Highly Significant X-ray Emission Lines
  74. GRB060714: optical observations
  75. IBAS Alert n. 3422: not a GRB
  76. GRB 060729: An update on the Swift XRT and UVOT observations
  77. GRB060717: optical observations
  78. GRB060807: Optical limiting magnitudes
  79. GRB 060805B: optical observation at Sierra Nevada
  80. GRB 060805B: XRT Team Analysis
  81. VLA Upper Limit on Outburst of SGR 1806-20
  82. GRB060806 is similar to previous activity of SGR1806-20
  83. GRB 060807: UVOT Upper limits
  84. GRB 060807: afterglow confirmation
  85. GRB 060807: XRT Team refined analysis
  86. GRB 060807: K- and R-band observations
  87. GRB 060807: Refined analysis of the Swift-BAT burst
  88. GRB060807: optical afterglow candidate
  89. GRB060806 = SGR1806-20
  90. GRB 060805B: RHESSI Spectral Fit
  91. GRB060807: optical upper limit in white light
  92. IPN triangulation of GRB060806 (long, exceptionally bright)
  93. GRB060807 - SDSS Pre-burst Observations
  94. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  95. GRB 060805B: Swift/UVOT Upper Limits
  96. GRB 060807, optical observation
  97. GRB 060807: Kanazawa R-band observation
  98. GRB 060807: optical limit
  99. GRB 060807: Swift detection of a burst
  100. GRB 060801: Second Epoch WSRT Radio Observations

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