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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"

11634 results found.

  1. GRB 220810A: Swift ToO observations
  2. GRB 220810A: MeerLICHT detection of two afterglow candidates
  3. Fermi GBM trigger 681998863/220812505 is not a GRB
  4. Fermi trigger No 681890304: Global MASTER-Net observations report
  5. Fermi GBM trigger 681890304/220811249 is not a GRB
  6. Fermi GRB 220810A: Global MASTER-Net observations report
  7. GRB 220810A: Fermi GBM Final Real-time Localization
  8. GRB 220627A: MeerKAT radio observations
  9. Fermi trigger No 681719116: Global MASTER-Net observations report
  10. Fermi GBM trigger 681719116/220809267 is not a GRB
  11. Fermi trigger No 681633544: Global MASTER-Net observations report
  12. Fermi GBM trigger 681633544/220808277 is not a GRB
  13. Fermi GBM trigger 681547990 / 220807287 is not a GRB
  14. GRB 220804A: Fermi GBM Final Localization
  15. Fermi trigger No 681271717: Global MASTER-Net observations report
  16. GRB 220803A: AstroSat CZTI detection
  17. Fermi trigger No 681212354: Global MASTER-Net observations report
  18. Konus-Wind detection of GRB 220730A (short)
  19. GRB 220730A: Fermi GBM detection
  20. GRB 220729A: AstroSat CZTI detection
  21. Fermi trigger No 680782656: Global MASTER-Net observations report
  22. Fermi GRB 220728A: Global MASTER-Net observations report
  23. GRB 220728A: Fermi GBM Final Real-time Localization
  24. GRB 220726A: Fermi GBM Final Real-time Localization
  25. Fermi trigger No 680421061: Global MASTER-Net observations report
  26. Fermi GRB 220724A: Global MASTER-Net observations report
  27. GRB 220724A: Fermi GBM Final Real-time Localization
  28. GRB 220715B: VIRT Optical Upper Limit
  29. Fermi GRB 220721A: Global MASTER-Net observations report
  30. GRB 220721A: Fermi GBM Final Real-time Localization
  31. Retraction: Fermi GBM trigger 679932336.585264/220719587 is not a GRB
  32. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  33. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  34. GRB 220719A: Fermi GBM Final Real-time Localization
  35. GRB 220715B: Fermi GBM detection
  36. GRB 220715B: BOOTES-network optical upper limits
  37. GRB 220715B: Fermi GBM Final Real-time Localization
  38. GRB 220714B: Fermi GBM observation
  39. GRB 220715A: AGILE/MCAL detection
  40. GRB 220715A: Fermi GBM Final Real-time Localization
  41. GRB 220713A: Fermi GBM Final Localization
  42. GRB 220714B: Fermi GBM Final Real-time Localization
  43. GRB 220711C: Fermi GBM Observation
  44. GRB 220711B: 10.4 m GTC(+EMIR) observations
  45. GRB 220711B: 10.4 m GTC(+EMIR) observations
  46. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  47. GRB 220711B: GIT optical upper limits
  48. Fermi trigger No 679248723: Global MASTER-Net observations report
  49. Fermi GRB 220711B: Global MASTER-Net observations report
  50. IPN triangulation of GRB 220711C (short)
  51. GRB 220711B: Fermi GBM Detection
  52. GRB 220711B: LCO Optical Upper Limits
  53. GRB 220711B: Fermi GBM Final Real-time Localization
  54. GRB 220708B: GIT optical upper limits
  55. GRB 220711A: Fermi GBM Final Real-time Localization
  56. GRB 220627A: ATCA detection of radio counterpart
  57. GRB 220702B: AstroSat CZTI detection
  58. GRB 220702B: Fermi GBM Final Localization
  59. GRB 220702A: Fermi GBM Final Localization
  60. GRB 220705A: Fermi GBM Final Localization
  61. Fermi trigger No 678635286: Global MASTER-Net observations report
  62. GRB 220627A: AstroSat CZTI detection
  63. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  64. GRB 220627A, GROND observations
  65. GRB 220624A: AGILE/GRID refined analysis
  66. Fermi-LAT Gamma-ray Observations of IceCube-220627A
  67. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  68. GRB 220627A: Swift-XRT afterglow detection
  69. Konus-Wind detection of GRB 220627A
  70. GRB 220627A: VLT MUSE redshift
  71. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  72. GRB 220627A: MeerLICHT candidate optical afterglow
  73. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  74. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  75. Konus-Wind detection of GRB 220624A
  76. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  77. GRB 220627A: Swift ToO observations
  78. GRB 220627A: Fermi-LAT detection
  79. Fermi trigger No 678058621: Global MASTER-Net observations report
  80. GRB 220627A: MeerLICHT detection of two afterglow candidates
  81. Fermi GRB 220627A: Global MASTER-Net observations report
  82. GRB 220627A: Fermi GBM Final Real-time Localization
  83. IceCube-220627A - IceCube observation of a high-energy neutrino candidate track-like event
  84. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  85. GRB 220624A: Fermi GBM Detection
  86. Fermi GRB 220623B: Global MASTER-Net observations report
  87. Fermi GRB 220624A: Global MASTER-Net observations report
  88. IPN triangulation of GRB 220624A
  89. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  90. GRB 220624A: AGILE/GRID analysis
  91. IceCube-220624A - IceCube observation of a high-energy neutrino candidate track-like event
  92. GRB 220624A: AGILE detection
  93. GRB 220624B: Fermi GBM Final Real-time Localization
  94. GRB 220624A: Fermi GBM Final Real-time Localization
  95. GRB 220623B: Fermi GBM Final Real-time Localization
  96. Fermi trigger No 677597318: Global MASTER-Net observations report
  97. GRB 220618A: Fermi GBM detection
  98. Konus-Wind detection of GRB 220617A
  99. Fermi trigger No 677377371: Global MASTER-Net observations report
  100. Fermi GRB 220620B: Global MASTER-Net observations report

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