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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"

14968 results found.

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

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