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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"

11622 results found.

  1. Fermi GBM trigger 681547990 / 220807287 is not a GRB
  2. GRB 220804A: Fermi GBM Final Localization
  3. Fermi trigger No 681271717: Global MASTER-Net observations report
  4. GRB 220803A: AstroSat CZTI detection
  5. Fermi trigger No 681212354: Global MASTER-Net observations report
  6. Konus-Wind detection of GRB 220730A (short)
  7. GRB 220730A: Fermi GBM detection
  8. GRB 220729A: AstroSat CZTI detection
  9. Fermi trigger No 680782656: Global MASTER-Net observations report
  10. Fermi GRB 220728A: Global MASTER-Net observations report
  11. GRB 220728A: Fermi GBM Final Real-time Localization
  12. GRB 220726A: Fermi GBM Final Real-time Localization
  13. Fermi trigger No 680421061: Global MASTER-Net observations report
  14. Fermi GRB 220724A: Global MASTER-Net observations report
  15. GRB 220724A: Fermi GBM Final Real-time Localization
  16. GRB 220715B: VIRT Optical Upper Limit
  17. Fermi GRB 220721A: Global MASTER-Net observations report
  18. GRB 220721A: Fermi GBM Final Real-time Localization
  19. Retraction: Fermi GBM trigger 679932336.585264/220719587 is not a GRB
  20. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  21. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  22. GRB 220719A: Fermi GBM Final Real-time Localization
  23. GRB 220715B: Fermi GBM detection
  24. GRB 220715B: BOOTES-network optical upper limits
  25. GRB 220715B: Fermi GBM Final Real-time Localization
  26. GRB 220714B: Fermi GBM observation
  27. GRB 220715A: AGILE/MCAL detection
  28. GRB 220715A: Fermi GBM Final Real-time Localization
  29. GRB 220713A: Fermi GBM Final Localization
  30. GRB 220714B: Fermi GBM Final Real-time Localization
  31. GRB 220711C: Fermi GBM Observation
  32. GRB 220711B: 10.4 m GTC(+EMIR) observations
  33. GRB 220711B: 10.4 m GTC(+EMIR) observations
  34. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  35. GRB 220711B: GIT optical upper limits
  36. Fermi trigger No 679248723: Global MASTER-Net observations report
  37. Fermi GRB 220711B: Global MASTER-Net observations report
  38. IPN triangulation of GRB 220711C (short)
  39. GRB 220711B: Fermi GBM Detection
  40. GRB 220711B: LCO Optical Upper Limits
  41. GRB 220711B: Fermi GBM Final Real-time Localization
  42. GRB 220708B: GIT optical upper limits
  43. GRB 220711A: Fermi GBM Final Real-time Localization
  44. GRB 220627A: ATCA detection of radio counterpart
  45. GRB 220702B: AstroSat CZTI detection
  46. GRB 220702B: Fermi GBM Final Localization
  47. GRB 220702A: Fermi GBM Final Localization
  48. GRB 220705A: Fermi GBM Final Localization
  49. Fermi trigger No 678635286: Global MASTER-Net observations report
  50. GRB 220627A: AstroSat CZTI detection
  51. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  52. GRB 220627A, GROND observations
  53. GRB 220624A: AGILE/GRID refined analysis
  54. Fermi-LAT Gamma-ray Observations of IceCube-220627A
  55. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  56. GRB 220627A: Swift-XRT afterglow detection
  57. Konus-Wind detection of GRB 220627A
  58. GRB 220627A: VLT MUSE redshift
  59. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  60. GRB 220627A: MeerLICHT candidate optical afterglow
  61. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  62. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  63. Konus-Wind detection of GRB 220624A
  64. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  65. GRB 220627A: Swift ToO observations
  66. GRB 220627A: Fermi-LAT detection
  67. Fermi trigger No 678058621: Global MASTER-Net observations report
  68. GRB 220627A: MeerLICHT detection of two afterglow candidates
  69. Fermi GRB 220627A: Global MASTER-Net observations report
  70. GRB 220627A: Fermi GBM Final Real-time Localization
  71. IceCube-220627A - IceCube observation of a high-energy neutrino candidate track-like event
  72. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  73. GRB 220624A: Fermi GBM Detection
  74. Fermi GRB 220623B: Global MASTER-Net observations report
  75. Fermi GRB 220624A: Global MASTER-Net observations report
  76. IPN triangulation of GRB 220624A
  77. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  78. GRB 220624A: AGILE/GRID analysis
  79. IceCube-220624A - IceCube observation of a high-energy neutrino candidate track-like event
  80. GRB 220624A: AGILE detection
  81. GRB 220624B: Fermi GBM Final Real-time Localization
  82. GRB 220624A: Fermi GBM Final Real-time Localization
  83. GRB 220623B: Fermi GBM Final Real-time Localization
  84. Fermi trigger No 677597318: Global MASTER-Net observations report
  85. GRB 220618A: Fermi GBM detection
  86. Konus-Wind detection of GRB 220617A
  87. Fermi trigger No 677377371: Global MASTER-Net observations report
  88. Fermi GRB 220620B: Global MASTER-Net observations report
  89. Fermi GRB 220620A: Global MASTER-Net observations report
  90. GRB 220620B: Fermi GBM Final Real-time Localization
  91. GRB 220619A: AstroSat CZTI detection
  92. GRB 220620A: Fermi GBM Final Real-time Localization
  93. GRB 220617A: TNG optical observations
  94. Fermi trigger No 677307509: Global MASTER-Net observations report
  95. Fermi trigger No 677236224: Global MASTER-Net observations report
  96. GRB 220617A: Fermi GBM observation
  97. IPN triangulation of GRB 220617A (short)
  98. GRB 220617A: Swift-XRT observations
  99. GRB 220617A: Fermi-LAT detection
  100. GRB 220617B: Swift ToO observations

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