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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"

11649 results found.

  1. GRB 230218A: Fermi GBM Final Real-time Localization
  2. GRB 230217A: AGILE/MCAL detection
  3. GRB 230216B: AstroSat CZTI detection
  4. GRB 230217A: Fermi GBM Final Real-time Localization
  5. IceCube-230217A - IceCube observation of a high-energy neutrino candidate track-like event
  6. Fermi GRB 230215A: Global MASTER-Net observations report
  7. GRB 230215A: Fermi GBM Final Real-time Localization
  8. GRB 230209B: AGILE detection
  9. GRB 230209B: Fermi GBM Observation
  10. IPN triangulation of GRB 230209B
  11. GRB 230204B: CALET Gamma-Ray Burst Monitor detection
  12. Outburst from LS V +44 17 / RX J0440.9+4431: Transient detection by GRBAlpha
  13. Fermi trigger No 697926015: Global MASTER-Net observations report
  14. Fermi trigger No 697904388: Global MASTER-Net observations report
  15. 230211A is not a GRB
  16. GRB 230211A: Fermi GBM Final Real-time Localization
  17. GRB 230209B: Swift/BAT-GUANO detection outside the coded FOV
  18. Fermi trigger No 697678542: Global MASTER-Net observations report
  19. GRB 230210A: Fermi GBM Final Real-time Localization
  20. Fermi GRB 230209B: Global MASTER-Net observations report
  21. GRB 230209B: Fermi GBM Final Real-time Localization
  22. GRB 230209A is not a GRB
  23. GRB 230209A: Fermi GBM Final Real-time Localization
  24. GRB 221009A: Continued Swift Observations
  25. Fermi Gamma-ray Burst Monitor trigger 230208382/697540213 is not a GRB
  26. GRB 230208A: Fermi GBM Final Real-time Localization
  27. Fermi Gamma-ray Burst Monitor triggers 230206723/697396830 and 230206797/697403223 are not GRBs
  28. Fermi GRB 230207A: Global MASTER-Net observations report
  29. GRB 230207A: Fermi GBM Final Real-time Localization
  30. Fermi trigger No 697403223: Global MASTER-Net observations report
  31. Fermi trigger No 697396830: Global MASTER-Net observations report
  32. GRB 230204B: Fermi GBM detection
  33. Fermi Gamma-ray Burst Monitor triggers due to recent activity of RX J0440.9+4431 (LS V +44 17)
  34. GRB 230204B: Detection by GRBAlpha
  35. GRB 230204B: AGILE detection
  36. IceCube-230201A: BOOTES-4/MET Optical Upper Limits
  37. GRB 230204B: AstroSat CZTI detection
  38. GRB 230204B: Swift/BAT-GUANO detection outside the coded FOV
  39. Fermi trigger No 697208885: Global MASTER-Net observations report
  40. GRB 230201B: TURBO Optical Upper Limits
  41. Fermi Gamma-ray Burst Monitor trigger 230203275 / 697098930 is not a GRB
  42. Fermi trigger No 697098930: Global MASTER-Net observations report
  43. Fermi GRB 230201B: Global MASTER-Net observations report
  44. Fermi-LAT gamma-ray observations of IceCube-230201A
  45. GRB 230201B: Fermi GBM Final Real-time Localization
  46. GRB 230126A: Detection by VZLUSAT-2
  47. Fermi GRB 230201A: Global MASTER-Net observations report
  48. IceCube-230201A - IceCube observation of a high-energy neutrino candidate track-like event
  49. GRB 230201A: Fermi GBM Final Real-time Localization
  50. GRB 230129A: AstroSat CZTI detection
  51. GRB 230128A: AstroSat CZTI detection
  52. GRB 230130A: Fermi GBM Final Real-time Localization
  53. GRB 230129A: Fermi GBM Final Real-time Localization
  54. GRB 230128A: Fermi GBM Final Real-time Localization
  55. GRB 230126A: Fermi GBM Final Real-time Localization
  56. GRB 230124A: Fermi GBM Observation
  57. GRB 230124A: Swift/BAT-GUANO detection outside the coded FOV
  58. Fermi GRB 230124A: Global MASTER-Net observations report
  59. GRB 230124A: Fermi GBM Final Real-time Localization
  60. Fermi-LAT gamma-ray observations of IceCube-230122A
  61. IceCube-230122A - IceCube observation of a high-energy neutrino candidate track-like event
  62. GRB 230116B: Fermi GBM observation
  63. IPN triangulation of GRB 230116B (short)
  64. GRB 230119A: CALET Gamma-Ray Burst Monitor detection
  65. GRB 230119A: Fermi GBM Final Real-time Localization
  66. Fermi GRB 230118A: Global MASTER-Net observations report
  67. GRB 230118A: Fermi GBM Final Real-time Localization
  68. Fermi trigger No 695569700: Global MASTER-Net observations report
  69. Fermi GRB 230117A: Global MASTER-Net observations report
  70. GRB 230117A: Fermi GBM Final Real-time Localization
  71. GRB 230116B: Fermi GBM Final Real-time Localization
  72. GRB 230116A: Fermi GBM Final Real-time Localization
  73. GRB 230114A: Detection by VZLUSAT-2
  74. Fermi-LAT gamma-ray observations of IceCube-230112A
  75. GRB 230114A: Fermi GBM Final Real-time Localization
  76. Fermi-LAT Gamma-ray Observations of IceCube-Cascade-230109A
  77. Fermi-LAT Gamma-ray Observations of IceCube-Cascade-221229A
  78. GRB 230111A: Fermi GBM Observation
  79. IceCube-230112A - IceCube observation of a high-energy neutrino candidate track-like event
  80. Fermi GRB 230112A: Global MASTER-Net observations report
  81. GRB 230112A: Fermi GBM Final Real-time Localization
  82. GRB 230111A: Fermi GBM Final Real-time Localization
  83. Fermi trigger No 695057654: Global MASTER-Net observations report
  84. GRB 230102A: Fermi GBM Observation
  85. Fermi Gamma-ray Burst Monitor trigger 694043024/221229905 is not a GRB
  86. GRB 221231A: 3.6m DOT optical upper limit
  87. GRB 230102A: Swift/BAT-GUANO detection outside the coded FOV
  88. GRB 221231A: Fermi GBM Observation
  89. Fermi Gamma-ray Burst Monitor trigger 694259491/230101411 is not a GRB
  90. GRB 230102A: Detection by GRBAlpha
  91. Fermi Gamma-ray Burst Monitor trigger 694302022/230101903 is not a GRB
  92. GRB 230101A: AstroSat CZTI detection
  93. Fermi trigger No 694259491: Global MASTER-Net observations report
  94. GRB 230102A: AGILE/MCAL detection
  95. GRB 230102A: Fermi GBM Final Real-time Localization
  96. GRB 221231A: AKO Upper Limit
  97. GRB 221231A: Swift/BAT-GUANO arcminute localization of a possibly short burst
  98. Fermi trigger No 694232203: Global MASTER-Net observations report
  99. GRB 230101A: Fermi GBM Final Real-time Localization
  100. GRB 221231A: Fermi GBM Final Real-time Localization

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