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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"

18468 results found.

  1. IPN triangulation of GRB060928 (long, exceptionally bright)
  2. GRB 060930: near-IR afterglow candidate
  3. VLA observations of GRB 060926
  4. GRB061002 - SDSS Pre-Burst Observations
  5. GRB 060908: Detection of a possible host
  6. GRB 060807: Detection of a possible host galaxy
  7. GRB 060923A: VLA K-band Observations
  8. GRB 060930: Xinglong TNT optical observations
  9. GRB 060929: Further XRT Refined Analysis
  10. GRB 060929: Swift/UVOT Optical Observations
  11. GRB 060929: TNG K-band observations
  12. GRB 060929, Swift-BAT refined analysis
  13. GRB060929: Optical limit
  14. Liverpool Telescope observations of GRB 060929
  15. GRB060908: optical observations
  16. GRB 060729: An update on the late-time Swift observations
  17. GRB 060927: Swift/UVOT Optical Observations
  18. GRB 060927 optical limit
  19. GRB 060927, Swift-BAT refined analysis
  20. GRB 060927: Xinglong TNT optical observations
  21. GRB 060927, optical observation
  22. GRB060927 - SDSS Pre-Burst Observations
  23. GRB 060926: Swift-UVOT Detections
  24. GRB 060923A: Radio Observations
  25. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  26. GRB 060923C: VLA Observation
  27. GRB 060923C: NIR afterglow confirmed
  28. GRB060923C: AROMA optical obsevation
  29. GRB 060923C, optical observation
  30. GRB 060923C: VLT J-band observations
  31. GRB 060923A: Keck and Gemini Observations
  32. GRB 060923C: Xinglong TNT optical observations
  33. GRB 060923C: Swift detection of a burst
  34. GRB 060923B: Swift detection of a burst
  35. GRB 060923: UKIRT nIR observations - candidate afterglow
  36. GRB060923 - SDSS Pre-Burst Observations
  37. GRB 060923: Swift detection of a burst
  38. GRB 060919 : Faulkes South Telescope Observations
  39. GRB060919: XRT refined analysis
  40. GRB 060919: TAROT optical observations
  41. GRB 060919: Swift detection of a burst
  42. GRB 060912A: VLA Observation
  43. GRB 060912A: Probable Host Galaxy
  44. GRB 060912: Correction to GCN 5559
  45. VLA observations of GRB 060908
  46. GRB 060908 - SDSS Pre-burst Observations
  47. GRB 060908: REM optical prompt observation
  48. GRB 060908: Swift detection of a burst with a bright optical counterpart
  49. GRB060906 , optical observation
  50. GRB 060906: Early RAPTOR optical limits
  51. GRB 060906, Swift-BAT refined spectral analysis
  52. GRB 060906: Confirmation of P60 Optical Afterglow
  53. GRB 060906 (?): P60 Optical Afterglow Candidate
  54. GRB060904b, optical observations
  55. GRB 060904B: RTT150 optical observations
  56. GRB060904A: Swift/UVOT optical observations
  57. GRB 060904A: Subaru NIR observation
  58. GRB 060904B: Swift-BAT refined analysis
  59. GRB 060904B: Swift-XRT refined analysis
  60. GRB 060904A: Refined analysis of the Swift-BAT burst
  61. GRB 060904A: Suzaku-XIS and -HXD observation plan
  62. GRB 060904A: P60 Observations
  63. GRB 060904B: TAROT optical counterpart observations
  64. GRB060904B - SDSS Pre-Burst Observations
  65. GRB 060904: TAROT optical observations
  66. GRB 060904B: Swift detection of a burst with optical counterpart
  67. GRB060904 - SDSS Pre-Burst Observations
  68. GRB 060904: Swift detection of a bright burst
  69. GRB060901: Optical observations
  70. 060901: Swift UVOT followup observations
  71. GRB 060605, observations using an Integral Field Unit
  72. GRB 060604: VLA Observation
  73. GRB 060605: VLA Observation
  74. GRB 060707: VLA observation
  75. GRB 060825: VLA observations
  76. GRB060826 - SDSS Pre-Burst Observations
  77. GRB 060826(?): Swift detection of a possible burst
  78. GRB 060825: TNG optical observations
  79. GRB 060825: TAROT optical observations
  80. GRB 060825: P60 Observations
  81. GRB 060729, SMARTS optical/IR observations
  82. GRB 060814: P60 Observations
  83. GRB 060814: P200 NIR Observations
  84. GRB 060814: VLT optical limits
  85. GRB 060814 - SDSS Pre-Burst Observations
  86. GRB 060814: TAROT optical observations
  87. GRB 060814: Swift detection of a bright burst
  88. GRB 060813: Refined analysis of the Swift-BAT burst
  89. GRB 060813: Swift detection of a burst
  90. GRB051109B: Late-time Radio Observations
  91. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  92. GRB 060729: An update on the Swift XRT and UVOT observations
  93. GRB060717: optical observations
  94. GRB 060805B: XRT Team Analysis
  95. GRB060807: optical afterglow candidate
  96. IPN triangulation of GRB060806 (long, exceptionally bright)
  97. GRB060807 - SDSS Pre-burst Observations
  98. GRB 060805B: Swift/UVOT Upper Limits
  99. GRB 060807, optical observation
  100. GRB 060807: Kanazawa R-band observation

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