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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"

36681 results found.

  1. GRB 060904B: Swift-BAT refined analysis
  2. Konus-Wind observation of GRB 060904A
  3. GRB 060904B: Swift-XRT refined analysis
  4. GRB 060904A: Refined analysis of the Swift-BAT burst
  5. GRB 060904A: Swift-XRT refined analysis
  6. GRB 060904A: Suzaku-XIS and -HXD observation plan
  7. GRB 060904B: VLT redshift
  8. GRB 060904A: P60 Observations
  9. GRB 060904B: Optical observations at Crni Vrh
  10. GRB060904B: Watcher observations
  11. GRB 060904B BOOTES-IR and 1.5m OSN observations
  12. GRB 060904B: TAROT optical counterpart observations
  13. GRB060904B - SDSS Pre-Burst Observations
  14. GRB 060904: TAROT optical observations
  15. GRB 060904B: Swift detection of a burst with optical counterpart
  16. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  17. GRB060904 - SDSS Pre-Burst Observations
  18. GRB 060904: Swift detection of a bright burst
  19. GRB 060901: pseudo-z from spectral parameters of the prompt
  20. Konus-Wind observation of GRB 060901
  21. GRB 060901: SMARTS optical/IR observations update
  22. GRB 060901: Swift/XRT Refined Analysis
  23. GRB 060901: SMARTS optical/IR observations
  24. GRB 060901: Swift/XRT Position
  25. GRB 060901: further INTEGRAL results
  26. GRB 060901: Watcher observations
  27. GRB 060901: a long GRB detected by INTEGRAL
  28. GRB 060605, observations using an Integral Field Unit
  29. GRB 060604: VLA Observation
  30. GRB 060814: Suzaku/WAM observation of the prompt emission
  31. GRB 060605: VLA Observation
  32. GRB 060707: VLA observation
  33. GRB 060825: VLA observations
  34. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  35. Swift-BAT trigger 226614 is not a GRB
  36. GRB060826 - SDSS Pre-Burst Observations
  37. GRB 060826(?): Swift detection of a possible burst
  38. GRB 060825: XRT Team Refined Analysis
  39. GRB 060825: Swift-BAT Refined Analysis
  40. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  41. GRB060825: Liverpool Telescope optical observations
  42. GRB 060825: TNG optical observations
  43. GRB 060825: TAROT optical observations
  44. GRB 060825: P60 Observations
  45. GRB060825: BOOTES-IR optical observations
  46. GRB 060825: Swift detection of a burst
  47. GRB060801: host galaxy redshift
  48. GRB060729: analysis of XMM-Newton observation
  49. GRB 060814: pseudo-z from spectral parameters of the prompt
  50. Radio observations of GRB 060719
  51. GRB 060729, SMARTS optical/IR observations
  52. GRB060814: Break in the XRT light curve
  53. GRB060813: Break in the XRT light curve
  54. GRB 060813: A long, bright GRB detected with Suzaku WAM
  55. GRB 060814: Confirmation of IR afterglow
  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: VLT optical limits
  67. GRB 060814 - SDSS Pre-Burst Observations
  68. GRB 060814: TAROT optical observations
  69. GRB 060814: Swift detection of a bright burst
  70. Konus-Wind observation of GRB 060813
  71. GRB060813: Swift/UVOT upper limits
  72. GRB 060813: Swift XRT refined analysis
  73. GRB 060813: Refined analysis of the Swift-BAT burst
  74. GRB 060813: Swift detection of a burst
  75. GRB051109B: Late-time Radio Observations
  76. Second VLA limit on new radio point source in SGR 1806-20
  77. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  78. GRB060714: optical observations
  79. IBAS Alert n. 3422: not a GRB
  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. VLA Upper Limit on Outburst of SGR 1806-20
  86. GRB 060807: UVOT Upper limits
  87. GRB 060807: afterglow confirmation
  88. GRB 060807: XRT Team refined analysis
  89. GRB 060807: K- and R-band observations
  90. GRB 060807: Refined analysis of the Swift-BAT burst
  91. GRB060807: optical afterglow candidate
  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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