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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"

35264 results found.

  1. GRB 060904: Swift detection of a bright burst
  2. GRB 060901: pseudo-z from spectral parameters of the prompt
  3. Konus-Wind observation of GRB 060901
  4. GRB 060901: SMARTS optical/IR observations update
  5. GRB 060901: Swift/XRT Refined Analysis
  6. GRB 060901: SMARTS optical/IR observations
  7. GRB 060901: Swift/XRT Position
  8. GRB 060901: further INTEGRAL results
  9. GRB 060901: Watcher observations
  10. GRB 060901: a long GRB detected by INTEGRAL
  11. GRB 060605, observations using an Integral Field Unit
  12. GRB 060604: VLA Observation
  13. GRB 060814: Suzaku/WAM observation of the prompt emission
  14. GRB 060605: VLA Observation
  15. GRB 060707: VLA observation
  16. GRB 060825: VLA observations
  17. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  18. Swift-BAT trigger 226614 is not a GRB
  19. GRB060826 - SDSS Pre-Burst Observations
  20. GRB 060826(?): Swift detection of a possible burst
  21. GRB 060825: XRT Team Refined Analysis
  22. GRB 060825: Swift-BAT Refined Analysis
  23. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  24. GRB060825: Liverpool Telescope optical observations
  25. GRB 060825: TNG optical observations
  26. GRB 060825: TAROT optical observations
  27. GRB 060825: P60 Observations
  28. GRB060825: BOOTES-IR optical observations
  29. GRB 060825: Swift detection of a burst
  30. GRB060801: host galaxy redshift
  31. GRB060729: analysis of XMM-Newton observation
  32. GRB 060814: pseudo-z from spectral parameters of the prompt
  33. Radio observations of GRB 060719
  34. GRB 060729, SMARTS optical/IR observations
  35. GRB060814: Break in the XRT light curve
  36. GRB060813: Break in the XRT light curve
  37. GRB 060813: A long, bright GRB detected with Suzaku WAM
  38. GRB 060814: Confirmation of IR afterglow
  39. Konus-Wind observation of GRB 060814
  40. GRB 060814: Refined analysis of the Swift-BAT burst
  41. GRB 060814: P60 Observations
  42. GRB 060814: P200 NIR Observations
  43. GRB 060814: source inside revised XRT error box
  44. GRB 060814: Possible IR counterpart
  45. GRB060805B: optical observations
  46. GRB060814: Swift/UVOT upper limits
  47. GRB 060813: pseudo-z from spectral parameters of the prompt
  48. GRB 060814: Swift XRT refined analysis
  49. GRB 060814: VLT optical limits
  50. GRB 060814 - SDSS Pre-Burst Observations
  51. GRB 060814: TAROT optical observations
  52. GRB 060814: Swift detection of a bright burst
  53. Konus-Wind observation of GRB 060813
  54. GRB060813: Swift/UVOT upper limits
  55. GRB 060813: Swift XRT refined analysis
  56. GRB 060813: Refined analysis of the Swift-BAT burst
  57. GRB 060813: Swift detection of a burst
  58. GRB051109B: Late-time Radio Observations
  59. Second VLA limit on new radio point source in SGR 1806-20
  60. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  61. GRB060714: optical observations
  62. IBAS Alert n. 3422: not a GRB
  63. GRB 060729: An update on the Swift XRT and UVOT observations
  64. GRB060717: optical observations
  65. GRB060807: Optical limiting magnitudes
  66. GRB 060805B: optical observation at Sierra Nevada
  67. GRB 060805B: XRT Team Analysis
  68. VLA Upper Limit on Outburst of SGR 1806-20
  69. GRB 060807: UVOT Upper limits
  70. GRB 060807: afterglow confirmation
  71. GRB 060807: XRT Team refined analysis
  72. GRB 060807: K- and R-band observations
  73. GRB 060807: Refined analysis of the Swift-BAT burst
  74. GRB060807: optical afterglow candidate
  75. GRB 060805B: RHESSI Spectral Fit
  76. GRB060807: optical upper limit in white light
  77. IPN triangulation of GRB060806 (long, exceptionally bright)
  78. GRB060807 - SDSS Pre-burst Observations
  79. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  80. GRB 060805B: Swift/UVOT Upper Limits
  81. GRB 060807, optical observation
  82. GRB 060807: Kanazawa R-band observation
  83. GRB 060807: optical limit
  84. GRB 060807: Swift detection of a burst
  85. GRB 060801: Second Epoch WSRT Radio Observations
  86. IPN triangulation of GRB060805B
  87. GRB 060805: optical upper limit in R
  88. GRB 060805: XRT Team Refined Analysis
  89. GRB 060805: Swift-BAT Refined Analysis
  90. GRB 060805: Swift/UVOT Upper Limits
  91. GRB 060805: P60 Observations
  92. GRB 060805: KAIT observations
  93. GRB 060805 - SDSS Pre-Burst Observations
  94. GRB 060805: Swift detection of a burst
  95. GRB 060804: Swift UVOT observations
  96. GRB 060804: Swift-XRT Team Refined Analysis
  97. GRB 060804: Refined analysis of the Swift-BAT burst
  98. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  99. GRB 060728: Upper limits of the X-ray emission
  100. GRB 060801: no variability of optical sources

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