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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"

32740 results found.

  1. GRB 060904A Milagro GeV/TeV Observations
  2. GRB060904b, optical observations
  3. GRB 060904b: SMARTS optical/IR afterglow observations
  4. GRB 060904B: RTT150 optical observations
  5. GRB060904A: Swift/UVOT optical observations
  6. GRB 060904A: Subaru NIR observation
  7. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  8. GRB 060904B: Swift-BAT refined analysis
  9. GRB060904b: Optical observations with Swift/UVOT
  10. Konus-Wind observation of GRB 060904A
  11. GRB 060904B: Swift-XRT refined analysis
  12. GRB 060904A: Refined analysis of the Swift-BAT burst
  13. GRB 060904A: Swift-XRT refined analysis
  14. GRB 060904A: Suzaku-XIS and -HXD observation plan
  15. GRB 060904B: VLT redshift
  16. GRB 060904A: P60 Observations
  17. GRB060904B: Watcher observations
  18. GRB 060904B BOOTES-IR and 1.5m OSN observations
  19. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  20. 060901: Swift UVOT followup observations
  21. Konus-Wind observation of GRB 060901
  22. GRB 060901: SMARTS optical/IR observations update
  23. GRB 060901: Swift/XRT Refined Analysis
  24. GRB 060901: SMARTS optical/IR observations
  25. GRB 060901: Swift/XRT Position
  26. GRB 060901: Watcher observations
  27. GRB 060605, observations using an Integral Field Unit
  28. GRB 060604: VLA Observation
  29. GRB 060814: Suzaku/WAM observation of the prompt emission
  30. GRB 060605: VLA Observation
  31. GRB 060707: VLA observation
  32. GRB 060825: VLA observations
  33. Swift-BAT trigger 226614 is not a GRB
  34. GRB 060825: XRT Team Refined Analysis
  35. GRB 060825: Swift-BAT Refined Analysis
  36. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  37. GRB060825: Liverpool Telescope optical observations
  38. GRB 060825: TNG optical observations
  39. GRB 060825: P60 Observations
  40. GRB060825: BOOTES-IR optical observations
  41. GRB060801: host galaxy redshift
  42. Radio observations of GRB 060719
  43. GRB 060729, SMARTS optical/IR observations
  44. GRB 060813: A long, bright GRB detected with Suzaku WAM
  45. GRB 060814: Confirmation of IR afterglow
  46. Konus-Wind observation of GRB 060814
  47. GRB 060814: Refined analysis of the Swift-BAT burst
  48. GRB 060814: P60 Observations
  49. GRB 060814: P200 NIR Observations
  50. GRB 060814: source inside revised XRT error box
  51. GRB 060814: Possible IR counterpart
  52. GRB060805B: optical observations
  53. GRB060814: Swift/UVOT upper limits
  54. GRB 060813: pseudo-z from spectral parameters of the prompt
  55. GRB 060814: Swift XRT refined analysis
  56. GRB 060814: VLT optical limits
  57. Konus-Wind observation of GRB 060813
  58. GRB060813: Swift/UVOT upper limits
  59. GRB 060813: Swift XRT refined analysis
  60. GRB 060813: Refined analysis of the Swift-BAT burst
  61. GRB051109B: Late-time Radio Observations
  62. Image of the dust-scattering halo around SGR 1806-20
  63. Second VLA limit on new radio point source in SGR 1806-20
  64. A dust-scattering halo detected around SGR 1806-20
  65. GRB 060729: An update on the Swift XRT and UVOT observations
  66. GRB060717: optical observations
  67. GRB060807: Optical limiting magnitudes
  68. GRB 060805B: XRT Team Analysis
  69. VLA Upper Limit on Outburst of SGR 1806-20
  70. GRB060806 is similar to previous activity of SGR1806-20
  71. GRB 060807: UVOT Upper limits
  72. GRB 060807: afterglow confirmation
  73. GRB 060807: K- and R-band observations
  74. GRB 060807: Refined analysis of the Swift-BAT burst
  75. GRB060806 = SGR1806-20
  76. GRB 060805B: RHESSI Spectral Fit
  77. GRB060807: optical upper limit in white light
  78. IPN triangulation of GRB060806 (long, exceptionally bright)
  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. GRB060805 Liverpool Telescope observations
  88. GRB 060805: optical upper limit in R
  89. GRB 060805: XRT Team Refined Analysis
  90. GRB 060805: Swift-BAT Refined Analysis
  91. GRB 060805: Swift/UVOT Upper Limits
  92. GRB 060805: P60 Observations
  93. GRB 060805: KAIT observations
  94. GRB 060804: Swift UVOT observations
  95. GRB 060804: Swift-XRT Team Refined Analysis
  96. GRB 060804: Refined analysis of the Swift-BAT burst
  97. GRB 060728: Upper limits of the X-ray emission
  98. GRB 060801: no variability of optical sources
  99. GRB 060801: WSRT Radio Observations
  100. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position

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