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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"

11837 results found.

  1. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  2. GRB 220403B: Swift detection of a burst with an optical counterpart
  3. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  4. Swift GRB220402.16: Global MASTER-Net observations report
  5. Fermi GRB 220401B: Global MASTER-Net observations report
  6. Fermi GRB 220330A: Global MASTER-Net observations report
  7. Konus-Wind observation of GRB 220320A
  8. GRB 220325A: 1.3m DFOT Optical upper limit
  9. GRB 220324A: AstroSat CZTI detection
  10. GRB 220323A: AstroSat CZTI detection
  11. GRB 220316A: AstroSat CZTI detection
  12. GRB 220320A: AstroSat CZTI detection
  13. GRB 220319A: LCO Optical Upper Limit
  14. GRB 220319A: Swift-XRT refined Analysis
  15. GRB 220319A: MASTER Global Robotic Net optical observations
  16. GRB 220319A: Swift detection of a burst
  17. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  18. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  19. IceCube-220317A: MASTER Global Robotic Net optical observations
  20. GRB 220310C: Swift-XRT observations
  21. Konus-Wind detection of GRB 220310A
  22. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  23. GRB 220311A: A long GRB detected by INTEGRAL
  24. Integral GRB220311.69: Global MASTER-Net observations report
  25. GRB 220308A: AGILE detection
  26. ZTF22aaajecp/AT2022cmc: Hubble Space Telescope Observations
  27. GRB 220310A: MAXI/GSC detection
  28. Konus-Wind detection of GRB 220308A
  29. Fermi GRB 220309A: Global MASTER-Net observations report
  30. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  31. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  32. IPN triangulation of GRB 220305B
  33. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  34. GRB 220306B: BOOTES-1 optical upper limit
  35. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  36. GRB 220306A: Fermi GBM Final Real-time Localization
  37. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  38. IceCube Alert 220304.74: Global MASTER-Net observations report
  39. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  40. Fermi GRB 220304A: Global MASTER-Net observations report
  41. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  42. GRB 220302A: Swift detection of a burst
  43. GRB 220228A: Fermi-LAT detection
  44. Konus-Wind detection of GRB 220222A
  45. IceCube-220225A: Upper limits from a search for additional neutrino events in IceCube
  46. Fermi trigger No 667737010: Global MASTER-Net observations report
  47. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  48. IceCube Alert 220225.59: Global MASTER-Net observations report
  49. ZTF22aaajecp/AT2022cmc: DECam Photometry
  50. Konus-Wind observation of GRB 220219B
  51. Fermi GRB 220223A: Global MASTER-Net observations report
  52. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  53. IceCube-220221A: Upper limits from a search for additional neutrino events in IceCube
  54. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  55. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  56. ZTF22aabjpxh/AT2022cva: Assy optical observations
  57. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  58. Konus-Wind observation of GRB 220219A
  59. IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart
  60. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  61. IceCube Alert 220220.60: Global MASTER-Net observations report
  62. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220220A
  63. Fermi trigger No 666962499: Global MASTER-Net observations report
  64. Swift GRB220218.94: Global MASTER-Net observations report
  65. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  66. Konus-Wind detection of GRB 220209A
  67. Konus-Wind detection of GRB 220211A
  68. Fermi trigger No 666489765: Global MASTER-Net observations report
  69. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220212A
  70. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  71. GRB 220209A: Fermi-LAT detection
  72. GRB 220210A: Fermi-LAT detection
  73. Fermi GRB 220211A: Global MASTER-Net observations report
  74. GRB 210919A: Maidanak optical observations
  75. GRB 220209A: AGILE/MCAL detection
  76. IceCube-220205B: Upper limits from a search for additional neutrino events in IceCube
  77. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  78. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  79. Konus-Wind detection of GRB 220130A
  80. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  81. Konus-Wind detection of GRB 220203A
  82. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  83. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  84. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  85. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  86. Konus-Wind detection of GRB 220128A
  87. GRB 220131B: GECAM detection
  88. GRB 220129A: Fermi GBM Final Real-time Localization
  89. Konus-Wind detection of GRB 220124A
  90. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  91. GRB 220117A: Terskol and AbAO optical upper limits
  92. GRB 220118A: TARGET optical upper limit
  93. GRB 220117B: TARGET optical upper limit
  94. Fermi-LAT-ANTARES 220121a: upper limits from a search for coincident neutrinos with IceCube
  95. AGILE observations of a bright burst from SGR 1935+2154
  96. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  97. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  98. IPN triangulation of GRB 211226A
  99. GRB 220120A: Fermi GBM Final Localization
  100. GRB 220118A: Fermi GBM detection

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