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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"

11607 results found.

  1. GRB 220323A: AGILE/MCAL detection
  2. IPN triangulation of GRB 220320A
  3. GRB 220323A: Fermi GBM Final Real-time Localization
  4. GRB 220316A: AstroSat CZTI detection
  5. GRB 220320A: AstroSat CZTI detection
  6. GRB 220317A: Fermi GBM detection
  7. GRB 220321A: Fermi GBM Final Localization
  8. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  9. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  10. GRB 220317A: Fermi GBM Final Real-time Localization
  11. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  12. GRB 220315A: MASTER Global Robotic Net optical observations
  13. GRB 220311A: Fermi GBM observation
  14. GRB 220315A: Fermi GBM Final Real-time Localization
  15. GRB 220311A: MITSuME Akeno optical upper limits
  16. IPN triangulation of GRB 220310A
  17. GRB 220310C: Fermi GBM observation
  18. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  19. GRB 220311A: Fermi GBM Final Real-time Localization
  20. GRB 220310C: Fermi GBM Final Real-time Localization
  21. Fermi GBM Detection of GRB 220308A
  22. GRB 220308A: AGILE detection
  23. Fermi GRB 220310B: Global MASTER-Net observations report
  24. GRB 220310B: Fermi GBM Final Real-time Localization
  25. GRB 220308B: Fermi GBM detection
  26. Fermi GRB 220309A: Global MASTER-Net observations report
  27. GRB 220309A: Fermi GBM Final Real-time Localization
  28. IPN triangulation of GRB 220308A (long / very bright)
  29. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  30. IPN triangulation of GRB 220305B
  31. Fermi trigger No 668410535: Global MASTER-Net observations report
  32. GRB 220306B: Tautenburg observations
  33. GRB 220304A Fermi GBM detection
  34. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  35. GRB 220306B: AbAO optical observations, possible afterglow candidate
  36. GRB 220306B: BOOTES-1 optical upper limit
  37. GRB 220306B: Fermi GBM observation
  38. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  39. Fermi GBM Sub-Threshold Detection of GRB 220305A
  40. Fermi GRB 220306A: Global MASTER-Net observations report
  41. GRB 220306A: Fermi GBM Final Real-time Localization
  42. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  43. Fermi GRB 220305A: Global MASTER-Net observations report
  44. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  45. GRB 220305A: Fermi GBM observation
  46. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  47. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  48. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  49. Fermi GRB 220304A: Global MASTER-Net observations report
  50. GRB 220304A: BALROG localization (Fermi Trigger / GRB 220304228)
  51. GRB 220304A: Fermi GBM Final Real-time Localization
  52. IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
  53. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  54. GRB 220228A: Fermi GBM observation
  55. GRB 220228A: Fermi-LAT detection
  56. GRB 220228A: Fermi GBM Final Localization
  57. Konus-Wind detection of GRB 220222A
  58. Fermi trigger No 667737010: Global MASTER-Net observations report
  59. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  60. IceCube-220225A - IceCube observation of a high-energy neutrino candidate track-like event
  61. IPN triangulation of GRB 220222A
  62. GCN Circ.draft on GRB 220222A
  63. Fermi GRB 220223A: Global MASTER-Net observations report
  64. GRB 220223A: Fermi GBM Final Real-time Localization
  65. Fermi GRB 220222B: Global MASTER-Net observations report
  66. GRB 220222B: Fermi GBM Final Real-time Localization
  67. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  68. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  69. Fermi GRB 220222A: Global MASTER-Net observations report
  70. GRB 220222A: Fermi GBM Final Real-time Localization
  71. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  72. Konus-Wind observation of GRB 220219A
  73. IPN triangulation of GRB 220219A
  74. IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
  75. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  76. Fermi trigger No 666962499: Global MASTER-Net observations report
  77. GRB 220219A: AGILE/MCAL detection
  78. GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
  79. GRB 220219A: Fermi GBM Final Real-time Localization
  80. GRB 220211A: redshift lower limit estimating
  81. Konus-Wind detection of GRB 220209A
  82. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  83. Konus-Wind detection of GRB 220211A
  84. IPN triangulation of GRB 220209A
  85. GRB 211023A: evidence of supernova in LBT spectra
  86. GRB 220211A: Fermi GBM observation
  87. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  88. Fermi trigger No 666489765: Global MASTER-Net observations report
  89. GRB 220214A: Fermi GBM Final Real-time Localization
  90. Fermi GBM trigger 666393834/220212892 is not a GRB
  91. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  92. IPN triangulation of GRB 220211A (short)
  93. GRB 220210A: Insight-HXMT/HE detection
  94. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  95. GRB 220210A: 1.5m OSN optical upper limit
  96. GRB 220210A: Fermi GBM detection
  97. Fermi GRB 220211B: Global MASTER-Net observations report
  98. GRB 220211B: Fermi GBM Final Real-time Localization
  99. GRB 220209A: Fermi-LAT detection
  100. GRB 220210A: Fermi-LAT detection

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