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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"

11623 results found.

  1. Fermi Gamma-ray Burst Monitor triggers 230206723/697396830 and 230206797/697403223 are not GRBs
  2. Fermi GRB 230207A: Global MASTER-Net observations report
  3. GRB 230207A: Fermi GBM Final Real-time Localization
  4. Fermi trigger No 697403223: Global MASTER-Net observations report
  5. Fermi trigger No 697396830: Global MASTER-Net observations report
  6. GRB 230204B: Fermi GBM detection
  7. Fermi Gamma-ray Burst Monitor triggers due to recent activity of RX J0440.9+4431 (LS V +44 17)
  8. GRB 230204B: Detection by GRBAlpha
  9. GRB 230204B: AGILE detection
  10. IceCube-230201A: BOOTES-4/MET Optical Upper Limits
  11. GRB 230204B: AstroSat CZTI detection
  12. GRB 230204B: Swift/BAT-GUANO detection outside the coded FOV
  13. Fermi trigger No 697208885: Global MASTER-Net observations report
  14. GRB 230201B: TURBO Optical Upper Limits
  15. Fermi Gamma-ray Burst Monitor trigger 230203275 / 697098930 is not a GRB
  16. Fermi trigger No 697098930: Global MASTER-Net observations report
  17. Fermi GRB 230201B: Global MASTER-Net observations report
  18. Fermi-LAT gamma-ray observations of IceCube-230201A
  19. GRB 230201B: Fermi GBM Final Real-time Localization
  20. GRB 230126A: Detection by VZLUSAT-2
  21. Fermi GRB 230201A: Global MASTER-Net observations report
  22. IceCube-230201A - IceCube observation of a high-energy neutrino candidate track-like event
  23. GRB 230201A: Fermi GBM Final Real-time Localization
  24. GRB 230129A: AstroSat CZTI detection
  25. GRB 230128A: AstroSat CZTI detection
  26. GRB 230130A: Fermi GBM Final Real-time Localization
  27. GRB 230129A: Fermi GBM Final Real-time Localization
  28. GRB 230128A: Fermi GBM Final Real-time Localization
  29. GRB 230126A: Fermi GBM Final Real-time Localization
  30. GRB 230124A: Fermi GBM Observation
  31. GRB 230124A: Swift/BAT-GUANO detection outside the coded FOV
  32. Fermi GRB 230124A: Global MASTER-Net observations report
  33. GRB 230124A: Fermi GBM Final Real-time Localization
  34. Fermi-LAT gamma-ray observations of IceCube-230122A
  35. IceCube-230122A - IceCube observation of a high-energy neutrino candidate track-like event
  36. GRB 230116B: Fermi GBM observation
  37. IPN triangulation of GRB 230116B (short)
  38. GRB 230119A: CALET Gamma-Ray Burst Monitor detection
  39. GRB 230119A: Fermi GBM Final Real-time Localization
  40. Fermi GRB 230118A: Global MASTER-Net observations report
  41. GRB 230118A: Fermi GBM Final Real-time Localization
  42. Fermi trigger No 695569700: Global MASTER-Net observations report
  43. Fermi GRB 230117A: Global MASTER-Net observations report
  44. GRB 230117A: Fermi GBM Final Real-time Localization
  45. GRB 230116B: Fermi GBM Final Real-time Localization
  46. GRB 230116A: Fermi GBM Final Real-time Localization
  47. GRB 230114A: Detection by VZLUSAT-2
  48. Fermi-LAT gamma-ray observations of IceCube-230112A
  49. GRB 230114A: Fermi GBM Final Real-time Localization
  50. Fermi-LAT Gamma-ray Observations of IceCube-Cascade-230109A
  51. Fermi-LAT Gamma-ray Observations of IceCube-Cascade-221229A
  52. GRB 230111A: Fermi GBM Observation
  53. IceCube-230112A - IceCube observation of a high-energy neutrino candidate track-like event
  54. Fermi GRB 230112A: Global MASTER-Net observations report
  55. GRB 230112A: Fermi GBM Final Real-time Localization
  56. GRB 230111A: Fermi GBM Final Real-time Localization
  57. Fermi trigger No 695057654: Global MASTER-Net observations report
  58. GRB 230102A: Fermi GBM Observation
  59. Fermi Gamma-ray Burst Monitor trigger 694043024/221229905 is not a GRB
  60. GRB 221231A: 3.6m DOT optical upper limit
  61. GRB 230102A: Swift/BAT-GUANO detection outside the coded FOV
  62. GRB 221231A: Fermi GBM Observation
  63. Fermi Gamma-ray Burst Monitor trigger 694259491/230101411 is not a GRB
  64. GRB 230102A: Detection by GRBAlpha
  65. Fermi Gamma-ray Burst Monitor trigger 694302022/230101903 is not a GRB
  66. GRB 230101A: AstroSat CZTI detection
  67. Fermi trigger No 694259491: Global MASTER-Net observations report
  68. GRB 230102A: AGILE/MCAL detection
  69. GRB 230102A: Fermi GBM Final Real-time Localization
  70. GRB 221231A: AKO Upper Limit
  71. GRB 221231A: Swift/BAT-GUANO arcminute localization of a possibly short burst
  72. Fermi trigger No 694232203: Global MASTER-Net observations report
  73. GRB 230101A: Fermi GBM Final Real-time Localization
  74. GRB 221231A: Fermi GBM Final Real-time Localization
  75. Fermi-LAT gamma-ray observations of IceCube-221229A
  76. GRB 221226A: Fermi GBM detection
  77. IPN triangulation of GRB 221226A
  78. IceCube-221229A - IceCube observation of a high-energy neutrino candidate track-like event
  79. GRB 221226A: Swift/BAT-GUANO detection outside the coded FOV
  80. GRB 221228A: Fermi GBM Final Real-time Localization
  81. GRB 221226A: AGILE detection
  82. GRB 221226B: Fermi GBM Observation
  83. GRB 221226B: VLT/X-shooter redshift and host galaxy
  84. GRB 221226B: Fermi GBM Final Real-time Localization
  85. Fermi GRB 221226A: Global MASTER-Net observations report
  86. GRB 221226A: Fermi GBM Final Real-time Localization
  87. Fermi-LAT gamma-ray observations of IceCube-221224A
  88. Fermi-LAT gamma-ray observations of IceCube-221223A
  89. Fermi GRB 221223A: Global MASTER-Net observations report
  90. IceCube-221224A - IceCube observation of a high-energy neutrino candidate track-like event
  91. GRB 221223A: Fermi GBM Final Real-time Localization
  92. IceCube-221223A - IceCube observation of a high-energy neutrino candidate track-like event
  93. GRB 221221A: AGILE detection
  94. Fermi GRB 221221A: Global MASTER-Net observations report
  95. GRB 221221A: Fermi GBM Final Real-time Localization
  96. GRB 221216A: Detection by VZLUSAT-2
  97. GRB 221215A: Fermi GBM Detection
  98. Fermi-LAT gamma-ray observations of IceCube-221216A
  99. GRB 221216A: Fermi GBM observation
  100. Fermi-LAT gamma-ray observations of IceCube-221210A

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