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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"

35953 results found.

  1. GRB 060604: VLA Observation
  2. GRB 060814: Suzaku/WAM observation of the prompt emission
  3. GRB 060605: VLA Observation
  4. GRB 060707: VLA observation
  5. GRB 060825: VLA observations
  6. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  7. Swift-BAT trigger 226614 is not a GRB
  8. GRB060826 - SDSS Pre-Burst Observations
  9. GRB 060826(?): Swift detection of a possible burst
  10. GRB 060825: XRT Team Refined Analysis
  11. GRB 060825: Swift-BAT Refined Analysis
  12. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  13. GRB060825: Liverpool Telescope optical observations
  14. GRB 060825: TNG optical observations
  15. GRB 060825: TAROT optical observations
  16. GRB 060825: P60 Observations
  17. GRB060825: BOOTES-IR optical observations
  18. GRB 060825: Swift detection of a burst
  19. GRB060801: host galaxy redshift
  20. GRB060729: analysis of XMM-Newton observation
  21. GRB 060814: pseudo-z from spectral parameters of the prompt
  22. Radio observations of GRB 060719
  23. GRB 060729, SMARTS optical/IR observations
  24. GRB060814: Break in the XRT light curve
  25. GRB060813: Break in the XRT light curve
  26. GRB 060813: A long, bright GRB detected with Suzaku WAM
  27. GRB 060814: Confirmation of IR afterglow
  28. Konus-Wind observation of GRB 060814
  29. GRB 060814: Refined analysis of the Swift-BAT burst
  30. GRB 060814: P60 Observations
  31. GRB 060814: P200 NIR Observations
  32. GRB 060814: source inside revised XRT error box
  33. GRB 060814: Possible IR counterpart
  34. GRB060805B: optical observations
  35. GRB060814: Swift/UVOT upper limits
  36. GRB 060813: pseudo-z from spectral parameters of the prompt
  37. GRB 060814: Swift XRT refined analysis
  38. GRB 060814: VLT optical limits
  39. GRB 060814 - SDSS Pre-Burst Observations
  40. GRB 060814: TAROT optical observations
  41. GRB 060814: Swift detection of a bright burst
  42. Konus-Wind observation of GRB 060813
  43. GRB060813: Swift/UVOT upper limits
  44. GRB 060813: Swift XRT refined analysis
  45. GRB 060813: Refined analysis of the Swift-BAT burst
  46. GRB 060813: Swift detection of a burst
  47. GRB051109B: Late-time Radio Observations
  48. Second VLA limit on new radio point source in SGR 1806-20
  49. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  50. GRB060714: optical observations
  51. IBAS Alert n. 3422: not a GRB
  52. GRB 060729: An update on the Swift XRT and UVOT observations
  53. GRB060717: optical observations
  54. GRB060807: Optical limiting magnitudes
  55. GRB 060805B: optical observation at Sierra Nevada
  56. GRB 060805B: XRT Team Analysis
  57. VLA Upper Limit on Outburst of SGR 1806-20
  58. GRB 060807: UVOT Upper limits
  59. GRB 060807: afterglow confirmation
  60. GRB 060807: XRT Team refined analysis
  61. GRB 060807: K- and R-band observations
  62. GRB 060807: Refined analysis of the Swift-BAT burst
  63. GRB060807: optical afterglow candidate
  64. GRB 060805B: RHESSI Spectral Fit
  65. GRB060807: optical upper limit in white light
  66. IPN triangulation of GRB060806 (long, exceptionally bright)
  67. GRB060807 - SDSS Pre-burst Observations
  68. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  69. GRB 060805B: Swift/UVOT Upper Limits
  70. GRB 060807, optical observation
  71. GRB 060807: Kanazawa R-band observation
  72. GRB 060807: optical limit
  73. GRB 060807: Swift detection of a burst
  74. GRB 060801: Second Epoch WSRT Radio Observations
  75. IPN triangulation of GRB060805B
  76. GRB 060805: optical upper limit in R
  77. GRB 060805: XRT Team Refined Analysis
  78. GRB 060805: Swift-BAT Refined Analysis
  79. GRB 060805: Swift/UVOT Upper Limits
  80. GRB 060805: P60 Observations
  81. GRB 060805: KAIT observations
  82. GRB 060805 - SDSS Pre-Burst Observations
  83. GRB 060805: Swift detection of a burst
  84. GRB 060804: Swift UVOT observations
  85. GRB 060804: Swift-XRT Team Refined Analysis
  86. GRB 060804: Refined analysis of the Swift-BAT burst
  87. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  88. GRB 060728: Upper limits of the X-ray emission
  89. GRB 060801: no variability of optical sources
  90. IBAS Alert 3418: not a GRB
  91. GRB 060801: WSRT Radio Observations
  92. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  93. GRB060801: Radio Observations
  94. GRB 051109B: Bright spiral host galaxy at low redshift
  95. GRB 060801: optical observations at FORS2/VLT
  96. GRB 060801: optical observations at Hanle and Calar Alto
  97. GRB060801: optical upper limit in R
  98. GRB 060801: Swift XRT refined analysis
  99. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  100. GRB 060801, optical observation

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