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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"

19666 results found.

  1. GRB 170524B: Swift ToO observations
  2. GRB 170524A: Swift-BAT refined analysis
  3. GRB 170524B: Swift detection of a burst
  4. GRB 170524A: Swift/UVOT Upper Limits
  5. GRB 170524A: Swift-XRT refined Analysis
  6. IPN Triangulation of GRB 170522A
  7. GRB 170524A: Enhanced Swift-XRT position
  8. GRB 170524A: Swift detection of a burst (or possible new SGR)
  9. GRB 170522A: LCO McDonald observations
  10. GRB 170522A: Swift-XRT observations
  11. GRB 170522A: Tiled Swift observations
  12. GRB 170522A: Fermi-LAT detection
  13. GRB170519A, Swift-UVOT Detection
  14. GRB 170519A: BOOTES-5/JGT early optical detection
  15. GRB 170519A: KAIT Optical Observations
  16. GRB 170519A: Swift-XRT refined Analysis
  17. GRB 170519A: Swift-BAT refined analysis
  18. GRB 170510A: LCO Siding Springs early observations
  19. GRB 170519A: Enhanced Swift-XRT position
  20. GRB 170519A: Swift detection of a burst with an optical counterpart
  21. GRB 170510A: Swift-XRT afterglow detection
  22. GRB 170516A: Swift-BAT refined analysis
  23. GRB 170516A: Swift-XRT refined Analysis
  24. AXP CXOU J164710.2-455216: Fermi GBM observation
  25. GRB 170516A: Swift/UVOT Upper Limits
  26. GRB 170516A: Enhanced Swift-XRT position
  27. GRB 170516A: Swift detection of a burst
  28. Swift Trigger AXP CXOU J164710.2-455216: MASTER-OAFA observations
  29. Swift Trigger on AXP CXOU J164710.2-455216
  30. GRB 170510A: LCO possible counterpart
  31. GRB 170510A: Swift-XRT observations
  32. GRB 170510A: Tiled Swift observations
  33. GRB 170510A: Fermi-LAT detection
  34. Swift Trigger 752193 is not a GRB
  35. Trigger 751928: Swift misidentification of Cen X-3
  36. Swift XRT observations of GRB 170424A
  37. LIGO/Virgo G284239: Swift/BAT data search
  38. GRB 170428A: 15 GHz upper limits from AMI
  39. Swift Trigger 748858: 15 GHz upper limits from AMI
  40. Short GRB 170428A: MASTER-OAFA final reduction of the optical observations
  41. GRB 170428A: TAROT La Silla observatory optical observations
  42. GRB 170428A: Swift/UVOT Upper Limits
  43. GRB 170428A: Swift-XRT refined Analysis
  44. GRB 170428A: Swift-BAT refined analysis
  45. Konus-Wind observation of GRB 170428A
  46. GRB 170428A: MASTER-OAFA early optical observations
  47. Swift Trigger 750337 is probably a noise fluctuation
  48. GRB 170428A: Swift detection of a short burst
  49. Swift trigger 750096 - OT candidate
  50. GRB170426.95 MASTER-Net OT detection
  51. Swift Trigger 750096 is probably a noise fluctuation
  52. Swift Trigger 750044 is probably a noise fluctuation
  53. GRB 170424A: LCO Observations
  54. GRB 170419A: Swift/UVOT Upper Limits
  55. GRB 170424A: Tiled Swift observations
  56. GRB 170424A: Fermi-LAT detection
  57. GRB 170419A: LCO Observations
  58. Swift Trigger 748858: AbAO and TSHAO optical observations
  59. Swift Trigger 748858: TAROT La Silla observatory optical observations
  60. Swift Trigger 748858: RATIR Optical and NIR Observations
  61. GRB 170419B, Swift-BAT refined analysis
  62. GRB 170419B: Zadko observatory - Gingin optical observations
  63. GRB 170419A: Zadko observatory - Gingin optical observations
  64. GRB 170419A: Swift-XRT refined Analysis
  65. GRB 170419B: Fermi GBM observation
  66. GRB 170419A: Swift-BAT refined analysis
  67. Swift trigger 748858: Swift BAT, XRT, and UVOT refined analysis
  68. GRB 170419B: Swift detection of a burst
  69. GRB 170419A: Enhanced Swift-XRT position
  70. Swift Trigger 748858: MASTER-OAFA early optical observations
  71. GRB 170419A: Swift detection of a burst
  72. Swift Trigger 748858: Zadko observatory - Gingin optical observations
  73. Swift Trigger 748858: a possible GRB
  74. GRB 170409A: Fermi-LAT detection
  75. GRB170405A, Swift-UVOT Detection
  76. GRB 170405A, Swift-BAT refined analysis
  77. GRB 170405A: Swift-XRT refined Analysis
  78. GRB 170405A: RATIR Optical and NIR Observations
  79. Konus-Wind observation of GRB 170405A
  80. GRB 170405A: LCO FTN observations
  81. Trigger 745966: Swift detection of 4U1850-03
  82. GRB 170405A: TAROT Reunion observatory optical observations
  83. GRB 170405A: Fermi-LAT detection
  84. GRB 170405A: Fermi GBM observation
  85. GRB 170405A: Enhanced Swift-XRT position
  86. GRB 170405A: Swift detection of a burst with an optical counterpart
  87. GRB 170330A CALET Gamma-Ray Burst Monitor detection
  88. IPN Triangulation of GRB 170403A (short)
  89. Konus-Wind observation of GRB 170330A
  90. Swift Trigger 745090 is a noise trigger near NGC 5195
  91. Swift triggered on SAX J1806.5-221
  92. GRB 170330A: AstroSat CZTI detection
  93. GRB 170330A: Swift-BAT refined analysis
  94. GRB 170331A: Swift-BAT refined analysis
  95. GRB 170331A: Swift/UVOT Upper Limits
  96. IceCube-170321A: Swift-XRT observations
  97. GRB 170330A: Swift-XRT refined Analysis
  98. GRB 170331A: Swift-XRT refined Analysis
  99. GRB 170330A: Enhanced Swift-XRT position
  100. GRB 170331A: Enhanced Swift-XRT position

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