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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').
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"

25907 results found.

  1. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  2. GRB 060904B: Swift-BAT refined analysis
  3. GRB060904b: Optical observations with Swift/UVOT
  4. Konus-Wind observation of GRB 060904A
  5. GRB 060904B: Swift-XRT refined analysis
  6. GRB 060904A: Refined analysis of the Swift-BAT burst
  7. GRB 060904A: Swift-XRT refined analysis
  8. GRB 060904A: Suzaku-XIS and -HXD observation plan
  9. GRB 060904A: P60 Observations
  10. GRB 060904B: Optical observations at Crni Vrh
  11. GRB060904B: Watcher observations
  12. GRB 060904B BOOTES-IR and 1.5m OSN observations
  13. GRB 060904B: TAROT optical counterpart observations
  14. GRB060904B - SDSS Pre-Burst Observations
  15. GRB 060904: TAROT optical observations
  16. GRB 060904B: Swift detection of a burst with optical counterpart
  17. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  18. GRB060904 - SDSS Pre-Burst Observations
  19. GRB 060904: Swift detection of a bright burst
  20. GRB060901: Optical observations
  21. 060901: Swift UVOT followup observations
  22. GRB 060901: Swift/XRT Refined Analysis
  23. GRB 060901: SMARTS optical/IR observations
  24. GRB 060901: Swift/XRT Position
  25. GRB 060604: VLA Observation
  26. GRB 060814: Suzaku/WAM observation of the prompt emission
  27. GRB 060605: VLA Observation
  28. GRB 060707: VLA observation
  29. GRB 060825: VLA observations
  30. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  31. Swift-BAT trigger 226614 is not a GRB
  32. GRB060826 - SDSS Pre-Burst Observations
  33. GRB 060826(?): Swift detection of a possible burst
  34. GRB 060825: XRT Team Refined Analysis
  35. GRB 060825: Swift-BAT Refined Analysis
  36. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  37. GRB060825: Liverpool Telescope optical observations
  38. GRB 060825: TNG optical observations
  39. GRB 060825: TAROT optical observations
  40. GRB 060825: P60 Observations
  41. GRB060825: BOOTES-IR optical observations
  42. GRB 060825: Swift detection of a burst
  43. GRB060729: analysis of XMM-Newton observation
  44. GRB 060814: pseudo-z from spectral parameters of the prompt
  45. Radio observations of GRB 060719
  46. GRB 060729, SMARTS optical/IR observations
  47. GRB060814: Break in the XRT light curve
  48. GRB060813: Break in the XRT light curve
  49. GRB 060813: A long, bright GRB detected with Suzaku WAM
  50. GRB 060814: Confirmation of IR afterglow
  51. Konus-Wind observation of GRB 060814
  52. GRB 060814: Refined analysis of the Swift-BAT burst
  53. GRB 060814: P60 Observations
  54. GRB 060814: P200 NIR Observations
  55. GRB 060814: source inside revised XRT error box
  56. GRB 060814: Possible IR counterpart
  57. GRB060805B: optical observations
  58. GRB060814: Swift/UVOT upper limits
  59. GRB 060813: pseudo-z from spectral parameters of the prompt
  60. GRB 060814: Swift XRT refined analysis
  61. GRB 060814: VLT optical limits
  62. GRB 060814 - SDSS Pre-Burst Observations
  63. GRB 060814: TAROT optical observations
  64. GRB 060814: Swift detection of a bright burst
  65. Konus-Wind observation of GRB 060813
  66. GRB060813: Swift/UVOT upper limits
  67. GRB 060813: Swift XRT refined analysis
  68. GRB 060813: Refined analysis of the Swift-BAT burst
  69. GRB 060813: Swift detection of a burst
  70. GRB051109B: Late-time Radio Observations
  71. Image of the dust-scattering halo around SGR 1806-20
  72. A dust-scattering halo detected around SGR 1806-20
  73. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  74. GRB060807: Possible Highly Significant X-ray Emission Lines
  75. GRB060714: optical observations
  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. GRB 060807: UVOT Upper limits
  82. GRB 060807: afterglow confirmation
  83. GRB 060807: XRT Team refined analysis
  84. GRB 060807: Refined analysis of the Swift-BAT burst
  85. GRB060807: optical afterglow candidate
  86. GRB060807: optical upper limit in white light
  87. IPN triangulation of GRB060806 (long, exceptionally bright)
  88. GRB060807 - SDSS Pre-burst Observations
  89. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  90. GRB 060805B: Swift/UVOT Upper Limits
  91. GRB 060807: Kanazawa R-band observation
  92. GRB 060807: optical limit
  93. GRB 060807: Swift detection of a burst
  94. GRB 060801: Second Epoch WSRT Radio Observations
  95. GRB060805 Liverpool Telescope observations
  96. GRB 060805: optical upper limit in R
  97. GRB 060805: XRT Team Refined Analysis
  98. GRB 060805: Swift-BAT Refined Analysis
  99. GRB 060805: Swift/UVOT Upper Limits
  100. GRB 060805: P60 Observations

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