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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

32721 results found.

  1. 060901: Swift UVOT followup observations
  2. Konus-Wind observation of GRB 060901
  3. GRB 060901: SMARTS optical/IR observations update
  4. GRB 060901: Swift/XRT Refined Analysis
  5. GRB 060901: SMARTS optical/IR observations
  6. GRB 060901: Swift/XRT Position
  7. GRB 060901: Watcher observations
  8. GRB 060605, observations using an Integral Field Unit
  9. GRB 060604: VLA Observation
  10. GRB 060814: Suzaku/WAM observation of the prompt emission
  11. GRB 060605: VLA Observation
  12. GRB 060707: VLA observation
  13. GRB 060825: VLA observations
  14. Swift-BAT trigger 226614 is not a GRB
  15. GRB 060825: XRT Team Refined Analysis
  16. GRB 060825: Swift-BAT Refined Analysis
  17. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  18. GRB060825: Liverpool Telescope optical observations
  19. GRB 060825: TNG optical observations
  20. GRB 060825: P60 Observations
  21. GRB060825: BOOTES-IR optical observations
  22. GRB060801: host galaxy redshift
  23. Radio observations of GRB 060719
  24. GRB 060729, SMARTS optical/IR observations
  25. GRB 060813: A long, bright GRB detected with Suzaku WAM
  26. GRB 060814: Confirmation of IR afterglow
  27. Konus-Wind observation of GRB 060814
  28. GRB 060814: Refined analysis of the Swift-BAT burst
  29. GRB 060814: P60 Observations
  30. GRB 060814: P200 NIR Observations
  31. GRB 060814: source inside revised XRT error box
  32. GRB 060814: Possible IR counterpart
  33. GRB060805B: optical observations
  34. GRB060814: Swift/UVOT upper limits
  35. GRB 060813: pseudo-z from spectral parameters of the prompt
  36. GRB 060814: Swift XRT refined analysis
  37. GRB 060814: VLT optical limits
  38. Konus-Wind observation of GRB 060813
  39. GRB060813: Swift/UVOT upper limits
  40. GRB 060813: Swift XRT refined analysis
  41. GRB 060813: Refined analysis of the Swift-BAT burst
  42. GRB051109B: Late-time Radio Observations
  43. Image of the dust-scattering halo around SGR 1806-20
  44. Second VLA limit on new radio point source in SGR 1806-20
  45. A dust-scattering halo detected around SGR 1806-20
  46. GRB 060729: An update on the Swift XRT and UVOT observations
  47. GRB060717: optical observations
  48. GRB060807: Optical limiting magnitudes
  49. GRB 060805B: XRT Team Analysis
  50. VLA Upper Limit on Outburst of SGR 1806-20
  51. GRB060806 is similar to previous activity of SGR1806-20
  52. GRB 060807: UVOT Upper limits
  53. GRB 060807: afterglow confirmation
  54. GRB 060807: K- and R-band observations
  55. GRB 060807: Refined analysis of the Swift-BAT burst
  56. GRB060806 = SGR1806-20
  57. GRB 060805B: RHESSI Spectral Fit
  58. GRB060807: optical upper limit in white light
  59. IPN triangulation of GRB060806 (long, exceptionally bright)
  60. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  61. GRB 060805B: Swift/UVOT Upper Limits
  62. GRB 060807, optical observation
  63. GRB 060807: Kanazawa R-band observation
  64. GRB 060807: optical limit
  65. GRB 060807: Swift detection of a burst
  66. GRB 060801: Second Epoch WSRT Radio Observations
  67. IPN triangulation of GRB060805B
  68. GRB060805 Liverpool Telescope observations
  69. GRB 060805: optical upper limit in R
  70. GRB 060805: XRT Team Refined Analysis
  71. GRB 060805: Swift-BAT Refined Analysis
  72. GRB 060805: Swift/UVOT Upper Limits
  73. GRB 060805: P60 Observations
  74. GRB 060805: KAIT observations
  75. GRB 060804: Swift UVOT observations
  76. GRB 060804: Swift-XRT Team Refined Analysis
  77. GRB 060804: Refined analysis of the Swift-BAT burst
  78. GRB 060728: Upper limits of the X-ray emission
  79. GRB 060801: no variability of optical sources
  80. GRB 060801: WSRT Radio Observations
  81. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  82. GRB060801: Radio Observations
  83. GRB 051109B: Bright spiral host galaxy at low redshift
  84. GRB 060801: optical observations at FORS2/VLT
  85. GRB060801: Swift/UVOT Upper Limits
  86. GRB 060801: optical observations at Hanle and Calar Alto
  87. GRB060801: optical upper limit in R
  88. GRB 060801: Swift XRT refined analysis
  89. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  90. GRB 060801, optical observation
  91. GRB 060801: Kanazawa Optical Observation
  92. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  93. GRB 060218 / SN 2006aj Nebular Spectrum
  94. GRB 060729 redshift
  95. GRB 060719: TORTOREM optical upper limits
  96. GRB 060729: Swift/UVOT Detections
  97. GRB 060729: Refined analysis of the Swift-BAT burst
  98. GRB 060729: Swift-XRT refined analysis
  99. GRB 060729: Swift/UVOT Observations
  100. GRB 060729: ROTSE-III Detection of Optical Counterpart

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