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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"

36784 results found.

  1. GRB060904A: Swift/UVOT optical observations
  2. GRB 060904A: Subaru NIR observation
  3. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  4. GRB 060904B: Swift-BAT refined analysis
  5. Konus-Wind observation of GRB 060904A
  6. GRB 060904B: Swift-XRT refined analysis
  7. GRB 060904A: Refined analysis of the Swift-BAT burst
  8. GRB 060904A: Swift-XRT refined analysis
  9. GRB 060904A: Suzaku-XIS and -HXD observation plan
  10. GRB 060904B: VLT redshift
  11. GRB 060904A: P60 Observations
  12. GRB 060904B: Optical observations at Crni Vrh
  13. GRB060904B: Watcher observations
  14. GRB 060904B BOOTES-IR and 1.5m OSN observations
  15. GRB 060904B: TAROT optical counterpart observations
  16. GRB060904B - SDSS Pre-Burst Observations
  17. GRB 060904: TAROT optical observations
  18. GRB 060904B: Swift detection of a burst with optical counterpart
  19. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  20. GRB060904 - SDSS Pre-Burst Observations
  21. GRB 060904: Swift detection of a bright burst
  22. GRB 060901: pseudo-z from spectral parameters of the prompt
  23. Konus-Wind observation of GRB 060901
  24. GRB 060901: SMARTS optical/IR observations update
  25. GRB 060901: Swift/XRT Refined Analysis
  26. GRB 060901: SMARTS optical/IR observations
  27. GRB 060901: Swift/XRT Position
  28. GRB 060901: further INTEGRAL results
  29. GRB 060901: Watcher observations
  30. GRB 060901: a long GRB detected by INTEGRAL
  31. GRB 060605, observations using an Integral Field Unit
  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. GRB060801: host galaxy redshift
  51. GRB060729: analysis of XMM-Newton observation
  52. GRB 060814: pseudo-z from spectral parameters of the prompt
  53. Radio observations of GRB 060719
  54. GRB 060729, SMARTS optical/IR observations
  55. GRB060814: Break in the XRT light curve
  56. GRB060813: Break in the XRT light curve
  57. GRB 060813: A long, bright GRB detected with Suzaku WAM
  58. GRB 060814: Confirmation of IR afterglow
  59. Konus-Wind observation of GRB 060814
  60. GRB 060814: Refined analysis of the Swift-BAT burst
  61. GRB 060814: P60 Observations
  62. GRB 060814: P200 NIR Observations
  63. GRB 060814: source inside revised XRT error box
  64. GRB 060814: Possible IR counterpart
  65. GRB060805B: optical observations
  66. GRB060814: Swift/UVOT upper limits
  67. GRB 060813: pseudo-z from spectral parameters of the prompt
  68. GRB 060814: Swift XRT refined analysis
  69. GRB 060814: VLT optical limits
  70. GRB 060814 - SDSS Pre-Burst Observations
  71. GRB 060814: TAROT optical observations
  72. GRB 060814: Swift detection of a bright burst
  73. Konus-Wind observation of GRB 060813
  74. GRB060813: Swift/UVOT upper limits
  75. GRB 060813: Swift XRT refined analysis
  76. GRB 060813: Refined analysis of the Swift-BAT burst
  77. GRB 060813: Swift detection of a burst
  78. GRB051109B: Late-time Radio Observations
  79. Second VLA limit on new radio point source in SGR 1806-20
  80. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  81. GRB060714: optical observations
  82. IBAS Alert n. 3422: not a GRB
  83. GRB 060729: An update on the Swift XRT and UVOT observations
  84. GRB060717: optical observations
  85. GRB060807: Optical limiting magnitudes
  86. GRB 060805B: optical observation at Sierra Nevada
  87. GRB 060805B: XRT Team Analysis
  88. VLA Upper Limit on Outburst of SGR 1806-20
  89. GRB 060807: UVOT Upper limits
  90. GRB 060807: afterglow confirmation
  91. GRB 060807: XRT Team refined analysis
  92. GRB 060807: K- and R-band observations
  93. GRB 060807: Refined analysis of the Swift-BAT burst
  94. GRB060807: optical afterglow candidate
  95. GRB 060805B: RHESSI Spectral Fit
  96. GRB060807: optical upper limit in white light
  97. IPN triangulation of GRB060806 (long, exceptionally bright)
  98. GRB060807 - SDSS Pre-burst Observations
  99. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  100. GRB 060805B: Swift/UVOT Upper Limits

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