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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"

31730 results found.

  1. GRB 060904B: Swift-XRT refined analysis
  2. GRB 060904A: Refined analysis of the Swift-BAT burst
  3. GRB 060904A: Swift-XRT refined analysis
  4. GRB 060904A: Suzaku-XIS and -HXD observation plan
  5. GRB 060904B: VLT redshift
  6. GRB 060904A: P60 Observations
  7. GRB060904B: Watcher observations
  8. GRB 060904B BOOTES-IR and 1.5m OSN observations
  9. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  10. 060901: Swift UVOT followup observations
  11. Konus-Wind observation of GRB 060901
  12. GRB 060901: SMARTS optical/IR observations update
  13. GRB 060901: Swift/XRT Refined Analysis
  14. GRB 060901: SMARTS optical/IR observations
  15. GRB 060901: Swift/XRT Position
  16. GRB 060901: Watcher observations
  17. GRB 060605, observations using an Integral Field Unit
  18. GRB 060604: VLA Observation
  19. GRB 060814: Suzaku/WAM observation of the prompt emission
  20. GRB 060605: VLA Observation
  21. GRB 060707: VLA observation
  22. GRB 060825: VLA observations
  23. Swift-BAT trigger 226614 is not a GRB
  24. GRB 060825: XRT Team Refined Analysis
  25. GRB 060825: Swift-BAT Refined Analysis
  26. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  27. GRB060825: Liverpool Telescope optical observations
  28. GRB 060825: TNG optical observations
  29. GRB 060825: P60 Observations
  30. GRB060825: BOOTES-IR optical observations
  31. GRB060801: host galaxy redshift
  32. Radio observations of GRB 060719
  33. GRB 060729, SMARTS optical/IR observations
  34. GRB 060813: A long, bright GRB detected with Suzaku WAM
  35. GRB 060814: Confirmation of IR afterglow
  36. Konus-Wind observation of GRB 060814
  37. GRB 060814: Refined analysis of the Swift-BAT burst
  38. GRB 060814: P60 Observations
  39. GRB 060814: P200 NIR Observations
  40. GRB 060814: source inside revised XRT error box
  41. GRB 060814: Possible IR counterpart
  42. GRB060805B: optical observations
  43. GRB060814: Swift/UVOT upper limits
  44. GRB 060813: pseudo-z from spectral parameters of the prompt
  45. GRB 060814: Swift XRT refined analysis
  46. GRB 060814: VLT optical limits
  47. Konus-Wind observation of GRB 060813
  48. GRB060813: Swift/UVOT upper limits
  49. GRB 060813: Swift XRT refined analysis
  50. GRB 060813: Refined analysis of the Swift-BAT burst
  51. GRB051109B: Late-time Radio Observations
  52. Image of the dust-scattering halo around SGR 1806-20
  53. Second VLA limit on new radio point source in SGR 1806-20
  54. A dust-scattering halo detected around SGR 1806-20
  55. GRB 060729: An update on the Swift XRT and UVOT observations
  56. GRB060717: optical observations
  57. GRB060807: Optical limiting magnitudes
  58. GRB 060805B: XRT Team Analysis
  59. VLA Upper Limit on Outburst of SGR 1806-20
  60. GRB060806 is similar to previous activity of SGR1806-20
  61. GRB 060807: UVOT Upper limits
  62. GRB 060807: afterglow confirmation
  63. GRB 060807: K- and R-band observations
  64. GRB 060807: Refined analysis of the Swift-BAT burst
  65. GRB060806 = SGR1806-20
  66. GRB 060805B: RHESSI Spectral Fit
  67. GRB060807: optical upper limit in white light
  68. IPN triangulation of GRB060806 (long, exceptionally bright)
  69. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  70. GRB 060805B: Swift/UVOT Upper Limits
  71. GRB 060807, optical observation
  72. GRB 060807: Kanazawa R-band observation
  73. GRB 060807: optical limit
  74. GRB 060807: Swift detection of a burst
  75. GRB 060801: Second Epoch WSRT Radio Observations
  76. IPN triangulation of GRB060805B
  77. GRB060805 Liverpool Telescope observations
  78. GRB 060805: optical upper limit in R
  79. GRB 060805: XRT Team Refined Analysis
  80. GRB 060805: Swift-BAT Refined Analysis
  81. GRB 060805: Swift/UVOT Upper Limits
  82. GRB 060805: P60 Observations
  83. GRB 060805: KAIT observations
  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 060728: Upper limits of the X-ray emission
  88. GRB 060801: no variability of optical sources
  89. GRB 060801: WSRT Radio Observations
  90. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  91. GRB060801: Radio Observations
  92. GRB 051109B: Bright spiral host galaxy at low redshift
  93. GRB 060801: optical observations at FORS2/VLT
  94. GRB060801: Swift/UVOT Upper Limits
  95. GRB 060801: optical observations at Hanle and Calar Alto
  96. GRB060801: optical upper limit in R
  97. GRB 060801: Swift XRT refined analysis
  98. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  99. GRB 060801, optical observation
  100. GRB 060801: Kanazawa Optical Observation

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