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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"

14972 results found.

  1. GRB 220306B: Swift detection of a burst
  2. Fermi GBM Sub-Threshold Detection of GRB 220305A
  3. GRB 220306A: Fermi GBM Final Real-time Localization
  4. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  5. GRB 220305A: Swift detection of a burst
  6. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  7. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  8. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  9. GRB 220304A: Fermi GBM Final Real-time Localization
  10. IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
  11. GRB 220302A: BOOTES-5/JGT optical upper limit
  12. ZTF22aaajecp/AT2022cmc: AMI-LA radio detection
  13. ZTF22aaajecp/AT2022cmc: ATCA detection
  14. GRB 220302A: Swift afterglow detection
  15. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  16. GRB 220302A: Swift detection of a burst
  17. GRB 220228A: Fermi-LAT detection
  18. GRB 220228A: Fermi GBM Final Localization
  19. Konus-Wind detection of GRB 220222A
  20. IceCube-220225A - IceCube observation of a high-energy neutrino candidate track-like event
  21. IPN triangulation of GRB 220222A
  22. ZTF22aaajecp/AT2022cmc: DECam Photometry
  23. GCN Circ.draft on GRB 220222A
  24. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  25. GRB 220223A: Fermi GBM Final Real-time Localization
  26. ZTF22aabjpxh/AT2022cva: 1.5m OSN optical observation
  27. GRB 220222B: Fermi GBM Final Real-time Localization
  28. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  29. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  30. GRB 220222A: Fermi GBM Final Real-time Localization
  31. ZTF22aabjpxh/AT2022cva: GMOS-N spectroscopy
  32. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  33. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  34. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  35. Konus-Wind observation of GRB 220219A
  36. IPN triangulation of GRB 220219A
  37. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  38. IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
  39. GRB 220218A: BOOTES-5/JGT optical upper limit
  40. ZTF22aaajecp/AT2022cmc: Keck DEIMOS Redshift
  41. GRB 220219A: AGILE/MCAL detection
  42. GRB 220219A: Fermi GBM Final Real-time Localization
  43. GRB 220218A: Swift detection of a burst
  44. Konus-Wind detection of GRB 220209A
  45. ZTF22aaajecp/AT2022cmc: VLT/X-shooter redshift
  46. ZTF22aaajecp/AT2022cmc: NICER X-ray detection
  47. Konus-Wind detection of GRB 220211A
  48. IPN triangulation of GRB 220209A
  49. ZTF22aaajecp/AT2022cmc: GMOS-N spectroscopy
  50. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  51. ZTF22aaajecp/AT2022cmc: VLA radio detection
  52. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  53. GRB 220214A: Fermi GBM Final Real-time Localization
  54. IPN triangulation of GRB 220211A (short)
  55. GRB 220210A: Insight-HXMT/HE detection
  56. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  57. GRB 220210A: 1.5m OSN optical upper limit
  58. GRB 220210A: Fermi GBM detection
  59. GRB 220211B: Fermi GBM Final Real-time Localization
  60. GRB 220209A: Fermi-LAT detection
  61. GRB 220210A: Fermi-LAT detection
  62. GRB 220210A: AGILE detection
  63. GRB 220211A: Fermi GBM Final Real-time Localization
  64. GRB 220210A: Fermi GBM Final Real-time Localization
  65. GRB 220209A: Fermi GBM Detection
  66. GRB 220209A: GECAM detection
  67. GRB 220209A: AGILE/MCAL detection
  68. GRB 220209A: Fermi GBM Final Real-time Localization
  69. IceCube-220205B: No neutrino counterpart candidates in ANTARES search
  70. Konus-Wind detection of GRB 220130A
  71. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  72. Konus-Wind detection of GRB 220203A
  73. GRB 220203A: GECAM detection
  74. IceCube-220205A - IceCube observation of a high-energy neutrino candidate track-like event
  75. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  76. IPN triangulation of GRB 220130A
  77. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  78. IceCube-220202A: IceCube observation of a high-energy neutrino candidate track-like event
  79. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  80. GRB 220201A: Fermi GBM Final Localization
  81. GRB 220128A: AstroSat CZTI detection
  82. Konus-Wind detection of GRB 220128A
  83. GRB 220131B: GECAM detection
  84. GRB 220130A: GECAM detection
  85. GRB 220131A: Fermi GBM Final Real-time Localization
  86. GRB 220129A: Fermi GBM Final Real-time Localization
  87. GRB 220127A: GECAM detection
  88. GECAM observations of a series of bursts from SGR J1935+2154
  89. Konus-Wind detection of GRB 220124A
  90. IPN triangulation of GRB 220124A
  91. GRB 220124A: GECAM detection
  92. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  93. GRB 220121B: GECAM detection
  94. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  95. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  96. IPN triangulation of GRB 211226A
  97. GRB 220120A: Fermi GBM Final Localization
  98. GRB 220118A: 2.2m CAHA/CAFOS detections
  99. GRB 220118A: Fermi GBM detection
  100. GRB 211221A: No V & R detection, KAO telescope

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