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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. GRB 170524A: Swift-XRT refined Analysis
  2. IPN Triangulation of GRB 170522A
  3. GRB 170524A: Enhanced Swift-XRT position
  4. GRB 170524A: Swift detection of a burst (or possible new SGR)
  5. GRB 170522A: LCO McDonald observations
  6. GRB 170522A: Swift-XRT observations
  7. GRB 170522A: Tiled Swift observations
  8. GRB 170522A: Fermi-LAT detection
  9. GRB170519A, Swift-UVOT Detection
  10. GRB 170519A: BOOTES-5/JGT early optical detection
  11. GRB 170519A: KAIT Optical Observations
  12. GRB 170519A: Swift-XRT refined Analysis
  13. GRB 170519A: Swift-BAT refined analysis
  14. GRB 170510A: LCO Siding Springs early observations
  15. GRB 170519A: Enhanced Swift-XRT position
  16. GRB 170519A: Swift detection of a burst with an optical counterpart
  17. GRB 170510A: Swift-XRT afterglow detection
  18. GRB 170516A: Swift-BAT refined analysis
  19. GRB 170516A: Swift-XRT refined Analysis
  20. AXP CXOU J164710.2-455216: Fermi GBM observation
  21. GRB 170516A: Swift/UVOT Upper Limits
  22. GRB 170516A: Enhanced Swift-XRT position
  23. GRB 170516A: Swift detection of a burst
  24. Swift Trigger AXP CXOU J164710.2-455216: MASTER-OAFA observations
  25. Swift Trigger on AXP CXOU J164710.2-455216
  26. GRB 170510A: LCO possible counterpart
  27. GRB 170510A: Swift-XRT observations
  28. GRB 170510A: Tiled Swift observations
  29. GRB 170510A: Fermi-LAT detection
  30. Swift Trigger 752193 is not a GRB
  31. Trigger 751928: Swift misidentification of Cen X-3
  32. Swift XRT observations of GRB 170424A
  33. LIGO/Virgo G284239: Swift/BAT data search
  34. GRB 170428A: 15 GHz upper limits from AMI
  35. Swift Trigger 748858: 15 GHz upper limits from AMI
  36. Short GRB 170428A: MASTER-OAFA final reduction of the optical observations
  37. GRB 170428A: TAROT La Silla observatory optical observations
  38. GRB 170428A: Swift/UVOT Upper Limits
  39. GRB 170428A: Swift-XRT refined Analysis
  40. GRB 170428A: Swift-BAT refined analysis
  41. Konus-Wind observation of GRB 170428A
  42. GRB 170428A: MASTER-OAFA early optical observations
  43. Swift Trigger 750337 is probably a noise fluctuation
  44. GRB 170428A: Swift detection of a short burst
  45. Swift trigger 750096 - OT candidate
  46. GRB170426.95 MASTER-Net OT detection
  47. Swift Trigger 750096 is probably a noise fluctuation
  48. Swift Trigger 750044 is probably a noise fluctuation
  49. GRB 170424A: LCO Observations
  50. GRB 170419A: Swift/UVOT Upper Limits
  51. GRB 170424A: Tiled Swift observations
  52. GRB 170424A: Fermi-LAT detection
  53. GRB 170419A: LCO Observations
  54. Swift Trigger 748858: AbAO and TSHAO optical observations
  55. Swift Trigger 748858: TAROT La Silla observatory optical observations
  56. Swift Trigger 748858: RATIR Optical and NIR Observations
  57. GRB 170419B, Swift-BAT refined analysis
  58. GRB 170419B: Zadko observatory - Gingin optical observations
  59. GRB 170419A: Zadko observatory - Gingin optical observations
  60. GRB 170419A: Swift-XRT refined Analysis
  61. GRB 170419B: Fermi GBM observation
  62. GRB 170419A: Swift-BAT refined analysis
  63. Swift trigger 748858: Swift BAT, XRT, and UVOT refined analysis
  64. GRB 170419B: Swift detection of a burst
  65. GRB 170419A: Enhanced Swift-XRT position
  66. Swift Trigger 748858: MASTER-OAFA early optical observations
  67. GRB 170419A: Swift detection of a burst
  68. Swift Trigger 748858: Zadko observatory - Gingin optical observations
  69. Swift Trigger 748858: a possible GRB
  70. GRB 170409A: Fermi-LAT detection
  71. GRB170405A, Swift-UVOT Detection
  72. GRB 170405A, Swift-BAT refined analysis
  73. GRB 170405A: Swift-XRT refined Analysis
  74. GRB 170405A: RATIR Optical and NIR Observations
  75. Konus-Wind observation of GRB 170405A
  76. GRB 170405A: LCO FTN observations
  77. Trigger 745966: Swift detection of 4U1850-03
  78. GRB 170405A: TAROT Reunion observatory optical observations
  79. GRB 170405A: Fermi-LAT detection
  80. GRB 170405A: Fermi GBM observation
  81. GRB 170405A: Enhanced Swift-XRT position
  82. GRB 170405A: Swift detection of a burst with an optical counterpart
  83. GRB 170330A CALET Gamma-Ray Burst Monitor detection
  84. IPN Triangulation of GRB 170403A (short)
  85. Konus-Wind observation of GRB 170330A
  86. Swift Trigger 745090 is a noise trigger near NGC 5195
  87. Swift triggered on SAX J1806.5-221
  88. GRB 170330A: AstroSat CZTI detection
  89. GRB 170330A: Swift-BAT refined analysis
  90. GRB 170331A: Swift-BAT refined analysis
  91. GRB 170331A: Swift/UVOT Upper Limits
  92. IceCube-170321A: Swift-XRT observations
  93. GRB 170330A: Swift-XRT refined Analysis
  94. GRB 170331A: Swift-XRT refined Analysis
  95. GRB 170330A: Enhanced Swift-XRT position
  96. GRB 170331A: Enhanced Swift-XRT position
  97. GRB 170330A: Swift/UVOT Detection of a Fading Afterglow
  98. GRB 170325A: 15 GHz upper limits from AMI
  99. GRB 170318B: 15 GHz upper limits from AMI
  100. GRB 170318A: 15 GHz upper limits from AMI

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