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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"

19662 results found.

  1. IPN Triangulation of GRB 170210A
  2. GRB 170209A: Swift ToO observations
  3. GRB 170208B: Swift/UVOT Upper Limits
  4. GRB 170208B: Swift-BAT refined analysis
  5. GRB 170208A: Swift-BAT refined analysis
  6. GRB 170208A: Swift-XRT refined Analysis
  7. GRB 170208B WHT nIR candidate afterglow
  8. GRB 170208B: Fermi GBM Detection
  9. GRB 170208A: Swift/UVOT Upper Limits
  10. Konus-Wind observation of GRB 170208B
  11. Konus-Wind observation of GRB 170208A
  12. GRB 170208B: GROND observations
  13. GRB 170208B: Swift-XRT refined Analysis
  14. GRB 170208B: Enhanced Swift-XRT position
  15. GRB 170208A: Enhanced Swift-XRT position
  16. GRB 170208A: Fermi GBM Detection
  17. GRB 170208B: Swift detection of a burst
  18. GRB 170208A: Swift detection of a burst
  19. IPN Triangulation of GRB 170207A (long/very bright)
  20. GRB 170206B: Swift/UVOT Upper Limits
  21. GRB 170206B: Swift-BAT refined analysis
  22. GRB 170206B: Swift-XRT refined Analysis
  23. GRB 170206B: Enhanced Swift-XRT position
  24. GRB 170206B: Swift detection of a burst
  25. GRB 170205A: Swift/UVOT Detection of a Fading Afterglow
  26. Konus-Wind observation of GRB 170205A
  27. GRB 170205A: Swift-BAT refined analysis
  28. GRB 170205A: Swift-XRT refined Analysis
  29. GRB 170205A: Enhanced Swift-XRT position
  30. GRB 170205A: LCO FTN observations
  31. Konus-Wind observation of GRB 170202A
  32. GRB 170205A: Swift detection of a burst with an optical counterpart
  33. GRB 170131A: POLAR Observation
  34. GRB 170203A: Swift-BAT refined analysis
  35. GRB 170202A: Swift-BAT refined analysis
  36. GRB 170202A: RATIR Optical and NIR Observations
  37. GRB 170202A: LCO FTN observations
  38. GRB 170202A: Swift-XRT refined Analysis
  39. GRB 170202A: T100 observations
  40. GRB 170202A: Swift/UVOT Detection
  41. GRB 170202A: Enhanced Swift-XRT position
  42. GRB 170203A: Swift detection of a burst
  43. GRB 170202A: Zadko observatory - Gingin optical observations
  44. GRB 170202A: LCO Sutherland observations
  45. GRB 170202A: MASTGlobal ER-Net bright OT nonmonotonic light curve
  46. GRB 170202A: Swift detection of a burst with an optical afterglow
  47. GRB 170131A: Swift/UVOT Upper Limits
  48. GRB 170131A: Swift-XRT observations
  49. GRB 170131A: Fermi GBM observation
  50. GRB 170131A: Swift ToO observations
  51. GRB 170131A detected in Swift/BAT ground processing
  52. GRB 170127B: Swift-BAT refined analysis
  53. GRB 170127A: Swift-BAT refined analysis
  54. GRB 170127C: Swift-XRT observations
  55. GRB 170127A: GROND Upper limits
  56. GRB 170127B: Swift-XRT refined Analysis
  57. GRB 170127A: Swift-XRT refined Analysis
  58. GRB 170126A, Swift-BAT refined analysis
  59. Swift Trigger 735413 is not an astrophysical event
  60. GRB 170127B: Swift/UVOT Upper Limits
  61. GRB 170127A: Swift/UVOT Upper Limits
  62. GRB 170127B: Fermi GBM observation
  63. GRB 170127B: Enhanced Swift-XRT position
  64. GRB 170127A: Enhanced Swift-XRT position
  65. Konus-Wind observation of GRB 170126A
  66. GRB 170127C: Tiled Swift observations
  67. GRB 170127C: Fermi-LAT detection
  68. GRB 170127B: MASTER-Kislovodsk early optical observations
  69. GRB 170127B: Swift detection of a short burst
  70. GRB 170127A: Prompt enhanced Swift-XRT position
  71. GRB 170127A: Swift detection of a burst
  72. GRB 170126A: AstroSat CZTI detection
  73. LIGO/Virgo G270580: Swift/UVOT follow-up of PS17yt
  74. GRB 170126A: Swift-XRT refined Analysis
  75. GRB 170126A: Swift/UVOT Detection of a Fading Afterglow
  76. GRB 170126A: Fermi GBM observation
  77. GRB 170126A: Enhanced Swift-XRT position
  78. GRB 170126A: Swift detection of a burst with an optical counterpart
  79. GRB 170115A: 15 GHz upper limits from AMI
  80. GRB 170115B: AGILE/SuperAGILE localisation
  81. LIGO/Virgo G270580: Swift-XRT follow-up of PS17yt
  82. GRB 170121B: MASTER early optical observations of the Swift possible XT
  83. GRB 170121B: Swift-XRT and UVOT observations
  84. GRB 170121B: Swift ToO observations
  85. LIGO/Virgo G270580: Swift-XRT sources
  86. LIGO/Virgo G270580: Swift/BAT data search
  87. GRB 170117A: Swift/UVOT Upper Limits
  88. GRB 170117A: Swift-XRT observations
  89. GRB 170117A: Swift ToO observations
  90. Swift Trigger #733426: possible detection of a burst or transient
  91. GRB 170115A: Swift/UVOT Upper Limits
  92. GRB 170115B: Swift-XRT observations
  93. LIGO/Virgo G268556: Swift-XRT observations of iPTF17cw
  94. GRB 170115A: Swift-BAT refined analysis
  95. GRB 170115A: Swift-XRT refined Analysis
  96. GRB 170115B: Tiled Swift observations
  97. GRB 170115A: Enhanced Swift-XRT position
  98. GRB 170115B: Fermi-LAT detection
  99. GRB 170115A: Swift detection of a burst
  100. GRB 170113A: GROND afterglow observations

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