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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. Retraction of Swift trigger 809374
  2. GRB 180210A: Swift ToO observations
  3. GRB 180210A: Fermi-LAT detection
  4. Trigger 809374: Swift detection of a possible non-burst faint source
  5. Trigger 809217: Swift trigger on RS CVn Star HD 8357
  6. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  7. GRB 180205A: confirmation of Swift-BAT trigger time.
  8. GRB 180205A: Swift/UVOT Detection
  9. GRB 180205A: Swift-XRT refined Analysis
  10. GRB 180205A: Swift-BAT refined analysis
  11. GRB 180205A: Further GROND Observations reveal Afterglow is still bright
  12. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  13. GRB 180205A: Fermi GBM observation
  14. Konus-Wind observation of GRB 180204A
  15. GRB 180205A: VLT/X-shooter redshift
  16. GRB 180205A: GROND detection of the NIR/optical afterglow
  17. GRB 180205A: KAIT optical afterglow confirmation
  18. GRB 180205A: Swift detection of a burst with a bright optical counterpart
  19. GRB 180204A: Swift-BAT refined analysis
  20. GRB 180204A: Swift/UVOT Upper Limits
  21. GRB 180204A: Fermi GBM detection
  22. GRB 180204A: Enhanced Swift-XRT position
  23. GRB 180204A: Swift-XRT refined Analysis
  24. GRB 180204A: Swift detection of a short burst
  25. GRB 180113A: AstroSat CZTI detection
  26. GRB 180115A: SEDM Observations
  27. Konus-Wind observation of GRB 171209A
  28. GRB 180115A: Swift/UVOT Detection
  29. GRB 180112A: Insight-HXMT/HE detection/observation
  30. GRB 180111A AROMA-N optical observation
  31. IPN Triangulation of GRB 180113C
  32. GRB 180115A: Swift-BAT refined analysis
  33. Konus-Wind observation of GRB 180113A
  34. GRB 180111A: Insight-HXMT/HE observation
  35. GRB 180113A: Swift ToO observations
  36. GRB 180115A: Swift-XRT refined Analysis
  37. GRB 180115A: Enhanced Swift-XRT position
  38. Konus-Wind observation of GRB 180111A
  39. GRB 180115A: Swift detection of a burst with an optical counterpart.
  40. GRB 180113A: Swift-BAT refined analysis
  41. GRB 180111A: AbAO optical observations
  42. GRB 180113A: KAIT Optical Observations
  43. GRB 180113A: Fermi GBM observation
  44. GRB 180111A: Swift/UVOT Detection
  45. GRB 180103A: Swift-XRT afterglow detection
  46. GRB 180113A: Swift detection of a burst
  47. GRB 180111A: Swift-BAT refined analysis
  48. GRB 180111A: RATIR Optical and NIR Observations
  49. GRB 180111A: Swift-XRT refined Analysis
  50. GRB 180111A: AGILE/MCAL detection
  51. GRB 180111A: Enhanced Swift-XRT position
  52. GRB 180111A: Swift detection of a burst with an optical counterpart
  53. GRB 180103A: LCO Sutherland 1-m telescope observations
  54. Konus-Wind observation of GRB 180103A
  55. GRB 180103A: AstroSat CZTI detection
  56. GRB 180103A: Swift/UVOT Upper Limits
  57. GRB 180103A: Swift-XRT observations
  58. GRB 180103A: Swift ToO observations
  59. GRB 180103A: Swift detection of a burst
  60. GRB 180102A AROMA-N optical observation
  61. GRB 180102A: Swift-BAT refined analysis
  62. GRB 180102A: Swift/UVOT Upper Limits
  63. GRB 180102A: MASTER-Net robotic report
  64. GRB 180102A: Swift-XRT refined Analysis
  65. GRB 180102A: Fermi GBM detection
  66. GRB 180102A: Enhanced Swift-XRT position
  67. GRB 180102A: Prompt enhanced Swift-XRT position
  68. GRB 180102A: Swift detection of a burst
  69. IceCube-171106A: Konus-Wind upper limits
  70. GRB 171222A: Swift-BAT refined analysis
  71. GRB 171222A: AROMA-N optical observation
  72. GRB 171222A: Fermi GBM detection
  73. GRB 171222A: Swift/UVOT Upper Limits
  74. GRB 171222A: MASTER-Net OT observations
  75. GRB 171222A: Swift-XRT refined Analysis
  76. GRB 171222A: Enhanced Swift-XRT position
  77. GRB 171222A: Swift detection of a burst
  78. GRB 171216A: Swift/UVOT Upper Limits
  79. GRB 171210A: Further Swift-XRT observations
  80. GRB 171216A: Swift-XRT refined Analysis
  81. GRB 171216A: Swift-BAT refined analysis
  82. GRB 171216A: Enhanced Swift-XRT position
  83. GRB 171216A: Swift detection of a burst
  84. Swift Trigger 797070: KAIT Optical Observations
  85. Swift Trigger 797070 is probably not a GRB
  86. GRB 171212A/Swift J1935.7+2036: Swift-BAT refined analysis
  87. GRB 171212A: Swift-XRT refined Analysis
  88. GRB 171211A iTelescope observation
  89. GRB 171212A/Swift J1935.7+2036: Swift/UVOT Upper Limits
  90. GRB 171212A/Swift J1935.7+2036: TSHAO optical observations
  91. GRB 171212A: Enhanced Swift-XRT position
  92. GRB 171212A: Swift detection of a burst or a Galactic transient
  93. GRB 171211A: Swift-BAT refined analysis
  94. GRB 171211A: Swift-XRT refined Analysis
  95. GRB 171211A: Swift/UVOT Upper Limits
  96. GRB 171209A: MASTER-Net optical observations
  97. GRB 171211A: Enhanced Swift-XRT position
  98. GRB 171210A: Swift-XRT and UVOT observations
  99. GRB 171211A: Swift detection of a possibly short burst
  100. GRB 171210A: Swift ToO observations

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