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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"

19664 results found.

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

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