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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

11546 results found.

  1. GRB 220825A: Fermi GBM observation
  2. GRB 220825A: Swift/BAT-GUANO detection
  3. GRB 220825A: Fermi GBM Final Localization
  4. GRB 220823A: Fermi GBM detection
  5. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  6. Fermi trigger No 682918137: Global MASTER-Net observations report
  7. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  8. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  9. GRB 220821A: Fermi GBM Final Real-time Localization
  10. GRB 220810A: Further Swift-XRT observations
  11. GRB 220810A: Swift-XRT observations
  12. Fermi trigger No 681998863: Global MASTER-Net observations report
  13. GRB 220810A: Swift ToO observations
  14. GRB 220810A: MeerLICHT detection of two afterglow candidates
  15. Fermi GBM trigger 681998863/220812505 is not a GRB
  16. Fermi trigger No 681890304: Global MASTER-Net observations report
  17. Fermi GBM trigger 681890304/220811249 is not a GRB
  18. Fermi GRB 220810A: Global MASTER-Net observations report
  19. GRB 220810A: Fermi GBM Final Real-time Localization
  20. GRB 220627A: MeerKAT radio observations
  21. Fermi trigger No 681719116: Global MASTER-Net observations report
  22. Fermi GBM trigger 681719116/220809267 is not a GRB
  23. Fermi trigger No 681633544: Global MASTER-Net observations report
  24. Fermi GBM trigger 681633544/220808277 is not a GRB
  25. Fermi GBM trigger 681547990 / 220807287 is not a GRB
  26. GRB 220804A: Fermi GBM Final Localization
  27. Fermi trigger No 681271717: Global MASTER-Net observations report
  28. GRB 220803A: AstroSat CZTI detection
  29. Fermi trigger No 681212354: Global MASTER-Net observations report
  30. Konus-Wind detection of GRB 220730A (short)
  31. GRB 220730A: Fermi GBM detection
  32. GRB 220729A: AstroSat CZTI detection
  33. Fermi trigger No 680782656: Global MASTER-Net observations report
  34. Fermi GRB 220728A: Global MASTER-Net observations report
  35. GRB 220728A: Fermi GBM Final Real-time Localization
  36. GRB 220726A: Fermi GBM Final Real-time Localization
  37. Fermi trigger No 680421061: Global MASTER-Net observations report
  38. Fermi GRB 220724A: Global MASTER-Net observations report
  39. GRB 220724A: Fermi GBM Final Real-time Localization
  40. GRB 220715B: VIRT Optical Upper Limit
  41. Fermi GRB 220721A: Global MASTER-Net observations report
  42. GRB 220721A: Fermi GBM Final Real-time Localization
  43. Retraction: Fermi GBM trigger 679932336.585264/220719587 is not a GRB
  44. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  45. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  46. GRB 220719A: Fermi GBM Final Real-time Localization
  47. GRB 220715B: Fermi GBM detection
  48. GRB 220715B: BOOTES-network optical upper limits
  49. GRB 220715B: Fermi GBM Final Real-time Localization
  50. GRB 220714B: Fermi GBM observation
  51. GRB 220715A: AGILE/MCAL detection
  52. GRB 220715A: Fermi GBM Final Real-time Localization
  53. GRB 220713A: Fermi GBM Final Localization
  54. GRB 220714B: Fermi GBM Final Real-time Localization
  55. GRB 220711C: Fermi GBM Observation
  56. GRB 220711B: 10.4 m GTC(+EMIR) observations
  57. GRB 220711B: 10.4 m GTC(+EMIR) observations
  58. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  59. GRB 220711B: GIT optical upper limits
  60. Fermi trigger No 679248723: Global MASTER-Net observations report
  61. Fermi GRB 220711B: Global MASTER-Net observations report
  62. IPN triangulation of GRB 220711C (short)
  63. GRB 220711B: Fermi GBM Detection
  64. GRB 220711B: LCO Optical Upper Limits
  65. GRB 220711B: Fermi GBM Final Real-time Localization
  66. GRB 220708B: GIT optical upper limits
  67. GRB 220711A: Fermi GBM Final Real-time Localization
  68. GRB 220627A: ATCA detection of radio counterpart
  69. GRB 220702B: AstroSat CZTI detection
  70. GRB 220702B: Fermi GBM Final Localization
  71. GRB 220702A: Fermi GBM Final Localization
  72. GRB 220705A: Fermi GBM Final Localization
  73. Fermi trigger No 678635286: Global MASTER-Net observations report
  74. GRB 220627A: AstroSat CZTI detection
  75. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  76. GRB 220627A, GROND observations
  77. GRB 220624A: AGILE/GRID refined analysis
  78. Fermi-LAT Gamma-ray Observations of IceCube-220627A
  79. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  80. GRB 220627A: Swift-XRT afterglow detection
  81. Konus-Wind detection of GRB 220627A
  82. GRB 220627A: VLT MUSE redshift
  83. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  84. GRB 220627A: MeerLICHT candidate optical afterglow
  85. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  86. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  87. Konus-Wind detection of GRB 220624A
  88. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  89. GRB 220627A: Swift ToO observations
  90. GRB 220627A: Fermi-LAT detection
  91. Fermi trigger No 678058621: Global MASTER-Net observations report
  92. GRB 220627A: MeerLICHT detection of two afterglow candidates
  93. Fermi GRB 220627A: Global MASTER-Net observations report
  94. GRB 220627A: Fermi GBM Final Real-time Localization
  95. IceCube-220627A - IceCube observation of a high-energy neutrino candidate track-like event
  96. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  97. GRB 220624A: Fermi GBM Detection
  98. Fermi GRB 220623B: Global MASTER-Net observations report
  99. Fermi GRB 220624A: Global MASTER-Net observations report
  100. IPN triangulation of GRB 220624A

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