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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"

11843 results found.

  1. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  2. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  3. IceCube Alert 220405.21: Global MASTER-Net observations report
  4. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  5. GRB 220403B: Fermi GBM detection
  6. GRB 220404A: Swift detection of a burst
  7. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  8. GRB 220403B: Swift detection of a burst with an optical counterpart
  9. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  10. Swift GRB220402.16: Global MASTER-Net observations report
  11. Fermi GRB 220401B: Global MASTER-Net observations report
  12. Fermi GRB 220330A: Global MASTER-Net observations report
  13. Konus-Wind observation of GRB 220320A
  14. GRB 220325A: 1.3m DFOT Optical upper limit
  15. GRB 220324A: AstroSat CZTI detection
  16. GRB 220323A: AstroSat CZTI detection
  17. GRB 220316A: AstroSat CZTI detection
  18. GRB 220320A: AstroSat CZTI detection
  19. GRB 220319A: LCO Optical Upper Limit
  20. GRB 220319A: Swift-XRT refined Analysis
  21. GRB 220319A: MASTER Global Robotic Net optical observations
  22. GRB 220319A: Swift detection of a burst
  23. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  24. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  25. IceCube-220317A: MASTER Global Robotic Net optical observations
  26. GRB 220310C: Swift-XRT observations
  27. Konus-Wind detection of GRB 220310A
  28. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  29. GRB 220311A: A long GRB detected by INTEGRAL
  30. Integral GRB220311.69: Global MASTER-Net observations report
  31. GRB 220308A: AGILE detection
  32. ZTF22aaajecp/AT2022cmc: Hubble Space Telescope Observations
  33. GRB 220310A: MAXI/GSC detection
  34. Konus-Wind detection of GRB 220308A
  35. Fermi GRB 220309A: Global MASTER-Net observations report
  36. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  37. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  38. IPN triangulation of GRB 220305B
  39. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  40. GRB 220306B: BOOTES-1 optical upper limit
  41. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  42. GRB 220306A: Fermi GBM Final Real-time Localization
  43. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  44. IceCube Alert 220304.74: Global MASTER-Net observations report
  45. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  46. Fermi GRB 220304A: Global MASTER-Net observations report
  47. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  48. GRB 220302A: Swift detection of a burst
  49. GRB 220228A: Fermi-LAT detection
  50. Konus-Wind detection of GRB 220222A
  51. IceCube-220225A: Upper limits from a search for additional neutrino events in IceCube
  52. Fermi trigger No 667737010: Global MASTER-Net observations report
  53. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  54. IceCube Alert 220225.59: Global MASTER-Net observations report
  55. ZTF22aaajecp/AT2022cmc: DECam Photometry
  56. Konus-Wind observation of GRB 220219B
  57. Fermi GRB 220223A: Global MASTER-Net observations report
  58. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  59. IceCube-220221A: Upper limits from a search for additional neutrino events in IceCube
  60. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  61. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  62. ZTF22aabjpxh/AT2022cva: Assy optical observations
  63. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  64. Konus-Wind observation of GRB 220219A
  65. IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart
  66. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  67. IceCube Alert 220220.60: Global MASTER-Net observations report
  68. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220220A
  69. Fermi trigger No 666962499: Global MASTER-Net observations report
  70. Swift GRB220218.94: Global MASTER-Net observations report
  71. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  72. Konus-Wind detection of GRB 220209A
  73. Konus-Wind detection of GRB 220211A
  74. Fermi trigger No 666489765: Global MASTER-Net observations report
  75. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220212A
  76. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  77. GRB 220209A: Fermi-LAT detection
  78. GRB 220210A: Fermi-LAT detection
  79. Fermi GRB 220211A: Global MASTER-Net observations report
  80. GRB 210919A: Maidanak optical observations
  81. GRB 220209A: AGILE/MCAL detection
  82. IceCube-220205B: Upper limits from a search for additional neutrino events in IceCube
  83. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  84. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  85. Konus-Wind detection of GRB 220130A
  86. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  87. Konus-Wind detection of GRB 220203A
  88. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  89. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  90. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  91. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  92. Konus-Wind detection of GRB 220128A
  93. GRB 220131B: GECAM detection
  94. GRB 220129A: Fermi GBM Final Real-time Localization
  95. Konus-Wind detection of GRB 220124A
  96. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  97. GRB 220117A: Terskol and AbAO optical upper limits
  98. GRB 220118A: TARGET optical upper limit
  99. GRB 220117B: TARGET optical upper limit
  100. Fermi-LAT-ANTARES 220121a: upper limits from a search for coincident neutrinos with IceCube

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