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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"

27318 results found.

  1. GRB 230307A: Upper limits from a neutrino search with IceCube
  2. Fermi GRB 230307A: Global MASTER-Net observations report
  3. GRB 230304B: CALET Gamma-Ray Burst Monitor detection
  4. Fermi GRB 230308A: Global MASTER-Net observations report
  5. GRB 230308A: BALROG localization (Fermi Trigger 699975152 / GRB 230308564)
  6. GRB 230308A: Fermi GBM Final Real-time Localization
  7. GRB 230305A: Detection by GRBAlpha
  8. GRB 230307A: BALROG localization (Fermi Trigger 699896651/ GRB 230307656)
  9. IPN triangulation of GRB 230307A (long/very bright)
  10. GRB 230307A: Fermi GBM Observation of a very bright burst
  11. GRB 230307A: Fermi GBM detection of a very bright GRB
  12. GRB 230307A: GECAM detection of an extremely bright burst
  13. GRB 230307A: Fermi GBM Final Real-time Localization
  14. Fermi trigger No 699811746: Global MASTER-Net observations report
  15. IceCube Alert 230306.46: Global MASTER-Net observations report
  16. GRB 230304B: Detection by GRBAlpha
  17. GRB 230304C: Fermi GBM Final Real-time Localization
  18. GRB 230304B: Fermi GBM Final Real-time Localization
  19. GRB 230304A: Fermi GBM Final Real-time Localization
  20. GRB 230228A: Swift-BAT refined analysis
  21. GRB 230228A: Swift/UVOT Upper Limits
  22. Fermi GRB 230301B: Global MASTER-Net observations report
  23. GRB 230301B: Fermi GBM Final Real-time Localization
  24. GRB 230228A: Fermi GBM Observation
  25. Fermi trigger No 699294715: Global MASTER-Net observations report
  26. Fermi trigger No 699311646: Global MASTER-Net observations report
  27. GRB 230301A: Fermi GBM Final Real-time Localization
  28. GRB 230228A: Swift-XRT refined Analysis
  29. GRB 230228A: Nanshan/NEXT optical upper limit
  30. GRB 230228A: Swift detection of a possibly short burst
  31. Fermi GRB 230227A: Global MASTER-Net observations report
  32. GRB 230227A: Fermi GBM Final Real-time Localization
  33. Fermi trigger No 699029364: Global MASTER-Net observations report
  34. GRB 230217A: Swift/UVOT Upper Limits
  35. GRB 230216A: Swift/UVOT Upper Limits
  36. GRB 230217A: Continued Gemini Observations
  37. GRB 230222A: Fermi GBM Final Real-time Localization
  38. GRB 230217A: Swift-BAT refined analysis
  39. Fermi GRB 230220B: Global MASTER-Net observations report
  40. GRB 230216B: CALET Gamma-Ray Burst Monitor detection
  41. GRB 230220B: Fermi GBM Final Real-time Localization
  42. GRB 230217A: Gemini-South Optical Observation
  43. GRB 230217A: Fermi GBM observation
  44. Fermi trigger No 698427992: Global MASTER-Net observations report
  45. IceCube Alert 230217.87: Global MASTER-Net observations report
  46. GRB 230218A is not a GRB
  47. GRB 230218A: Fermi GBM Final Real-time Localization
  48. GRB 230207B: CALET Gamma-Ray Burst Monitor detection
  49. GRB 230216A: SVOM/C-GFT optical upper limit
  50. GRB 230217A: Swift detection of a short burst
  51. GRB 230217A: Fermi GBM Final Real-time Localization
  52. GRB 230216A: Swift-BAT refined analysis
  53. GRB 230216A: Swift-XRT refined Analysis
  54. Swift GRB 230216A: Global MASTER-Net observations report
  55. GRB 230216A: AKO Upper Limit
  56. GRB 230216A: Zadko observatory - Gingin optical observations
  57. GRB 230216A: Swift detection of a burst
  58. Fermi GRB 230215A: Global MASTER-Net observations report
  59. GRB 230215A: Fermi GBM Final Real-time Localization
  60. GRB 230209B: Fermi GBM Observation
  61. IPN triangulation of GRB 230209B
  62. GRB 230204B: CALET Gamma-Ray Burst Monitor detection
  63. GRB 230204B: ATCA radio detection
  64. Outburst from LS V +44 17 / RX J0440.9+4431: Transient detection by GRBAlpha
  65. Fermi trigger No 697926015: Global MASTER-Net observations report
  66. Fermi trigger No 697904388: Global MASTER-Net observations report
  67. 230211A is not a GRB
  68. GRB 230211A: Fermi GBM Final Real-time Localization
  69. GRB 230209B: Swift/BAT-GUANO detection outside the coded FOV
  70. Fermi trigger No 697678542: Global MASTER-Net observations report
  71. Swift Trigger 1153670 is probably not a GRB
  72. GRB 230210A: Fermi GBM Final Real-time Localization
  73. Fermi GRB 230209B: Global MASTER-Net observations report
  74. GRB 230209B: Fermi GBM Final Real-time Localization
  75. GRB 230209A is not a GRB
  76. GRB 230209A: Fermi GBM Final Real-time Localization
  77. GRB 221009A: Continued Swift Observations
  78. Fermi Gamma-ray Burst Monitor trigger 230208382/697540213 is not a GRB
  79. GRB 230207B: Detection by GRBAlpha
  80. GRB 230204B: MASTER early OT detection
  81. GRB 230208A: Fermi GBM Final Real-time Localization
  82. Fermi Gamma-ray Burst Monitor triggers 230206723/697396830 and 230206797/697403223 are not GRBs
  83. GRB 230207B: Swift/BAT-GUANO detection outside the coded FOV
  84. Fermi GRB 230207A: Global MASTER-Net observations report
  85. GRB 230207A: Fermi GBM Final Real-time Localization
  86. GRB 230204B: LCOGT Optical Upper Limits
  87. GRB 230204B: Swift/UVOT Upper Limits
  88. Fermi trigger No 697403223: Global MASTER-Net observations report
  89. Fermi trigger No 697396830: Global MASTER-Net observations report
  90. GRB 230205A: Swift/UVOT Upper Limits
  91. GRB 230204B: Fermi GBM detection
  92. Fermi Gamma-ray Burst Monitor triggers due to recent activity of RX J0440.9+4431 (LS V +44 17)
  93. GRB 230205A: LCOGT Optical Upper Limits
  94. GRB 230205A: SVOM/C-GFT optical upper limit
  95. GRB 230205A: OHP/T193 optical observations
  96. GRB 230205A: Swift-BAT refined analysis (T90 = 2.3 s)
  97. GRB 230204A: Swift-BAT refined analysis
  98. GRB 230205A: Swift-XRT refined Analysis
  99. GRB 230205A: BOOTES-5/JGT early optical upper limit
  100. GRB 230204B: Detection by GRBAlpha

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