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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"

21455 results found.

  1. GRB 060906: FRAM observations - flash determination (airplane)
  2. GRB 060906: KAIT observations
  3. GRB 060906: observations with FRAM
  4. GRB 060906 (?): P60 Optical Afterglow Candidate
  5. GRB 060906: Swift detection of a probable burst
  6. GRB 060904A Milagro GeV/TeV Observations
  7. GRB060904A: Swift/UVOT optical observations
  8. GRB 060904A: Subaru NIR observation
  9. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  10. GRB 060904B: Swift-BAT refined analysis
  11. GRB060904b: Optical observations with Swift/UVOT
  12. Konus-Wind observation of GRB 060904A
  13. GRB 060904B: Swift-XRT refined analysis
  14. GRB 060904A: Refined analysis of the Swift-BAT burst
  15. GRB 060904A: Swift-XRT refined analysis
  16. GRB 060904A: Suzaku-XIS and -HXD observation plan
  17. GRB 060904A: P60 Observations
  18. GRB 060904B: Optical observations at Crni Vrh
  19. GRB060904B: Watcher observations
  20. GRB 060904B BOOTES-IR and 1.5m OSN observations
  21. GRB 060904B: TAROT optical counterpart observations
  22. GRB060904B - SDSS Pre-Burst Observations
  23. GRB 060904: TAROT optical observations
  24. GRB 060904B: Swift detection of a burst with optical counterpart
  25. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  26. GRB060904 - SDSS Pre-Burst Observations
  27. GRB 060904: Swift detection of a bright burst
  28. GRB060901: Optical observations
  29. 060901: Swift UVOT followup observations
  30. GRB 060901: Swift/XRT Refined Analysis
  31. GRB 060901: Swift/XRT Position
  32. GRB 060604: VLA Observation
  33. GRB 060814: Suzaku/WAM observation of the prompt emission
  34. GRB 060605: VLA Observation
  35. GRB 060707: VLA observation
  36. GRB 060825: VLA observations
  37. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  38. Swift-BAT trigger 226614 is not a GRB
  39. GRB060826 - SDSS Pre-Burst Observations
  40. GRB 060826(?): Swift detection of a possible burst
  41. GRB 060825: XRT Team Refined Analysis
  42. GRB 060825: Swift-BAT Refined Analysis
  43. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  44. GRB060825: Liverpool Telescope optical observations
  45. GRB 060825: TNG optical observations
  46. GRB 060825: TAROT optical observations
  47. GRB 060825: P60 Observations
  48. GRB060825: BOOTES-IR optical observations
  49. GRB 060825: Swift detection of a burst
  50. GRB060729: analysis of XMM-Newton observation
  51. GRB 060814: pseudo-z from spectral parameters of the prompt
  52. Radio observations of GRB 060719
  53. GRB060814: Break in the XRT light curve
  54. GRB060813: Break in the XRT light curve
  55. GRB 060813: A long, bright GRB detected with Suzaku WAM
  56. Konus-Wind observation of GRB 060814
  57. GRB 060814: Refined analysis of the Swift-BAT burst
  58. GRB 060814: P60 Observations
  59. GRB 060814: P200 NIR Observations
  60. GRB 060814: source inside revised XRT error box
  61. GRB 060814: Possible IR counterpart
  62. GRB060805B: optical observations
  63. GRB060814: Swift/UVOT upper limits
  64. GRB 060813: pseudo-z from spectral parameters of the prompt
  65. GRB 060814: Swift XRT refined analysis
  66. GRB 060814 - SDSS Pre-Burst Observations
  67. GRB 060814: TAROT optical observations
  68. GRB 060814: Swift detection of a bright burst
  69. Konus-Wind observation of GRB 060813
  70. GRB060813: Swift/UVOT upper limits
  71. GRB 060813: Swift XRT refined analysis
  72. GRB 060813: Refined analysis of the Swift-BAT burst
  73. GRB 060813: Swift detection of a burst
  74. GRB051109B: Late-time Radio Observations
  75. Image of the dust-scattering halo around SGR 1806-20
  76. A dust-scattering halo detected around SGR 1806-20
  77. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  78. GRB060807: Possible Highly Significant X-ray Emission Lines
  79. GRB060714: optical observations
  80. GRB 060729: An update on the Swift XRT and UVOT observations
  81. GRB060717: optical observations
  82. GRB060807: Optical limiting magnitudes
  83. GRB 060805B: optical observation at Sierra Nevada
  84. GRB 060805B: XRT Team Analysis
  85. GRB 060807: UVOT Upper limits
  86. GRB 060807: XRT Team refined analysis
  87. GRB 060807: Refined analysis of the Swift-BAT burst
  88. GRB060807: optical afterglow candidate
  89. GRB060807: optical upper limit in white light
  90. IPN triangulation of GRB060806 (long, exceptionally bright)
  91. GRB060807 - SDSS Pre-burst Observations
  92. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  93. GRB 060805B: Swift/UVOT Upper Limits
  94. GRB 060807: Kanazawa R-band observation
  95. GRB 060807: optical limit
  96. GRB 060807: Swift detection of a burst
  97. GRB 060801: Second Epoch WSRT Radio Observations
  98. GRB060805 Liverpool Telescope observations
  99. GRB 060805: optical upper limit in R
  100. GRB 060805: XRT Team Refined Analysis

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