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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"

11610 results found.

  1. Fermi GBM Sub-Threshold Detection of GRB 220325A
  2. GRB 220324A: AstroSat CZTI detection
  3. GRB 220323A: AstroSat CZTI detection
  4. GRB 220323A: AGILE/MCAL detection
  5. IPN triangulation of GRB 220320A
  6. GRB 220323A: Fermi GBM Final Real-time Localization
  7. GRB 220316A: AstroSat CZTI detection
  8. GRB 220320A: AstroSat CZTI detection
  9. GRB 220317A: Fermi GBM detection
  10. GRB 220321A: Fermi GBM Final Localization
  11. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  12. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  13. GRB 220317A: Fermi GBM Final Real-time Localization
  14. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  15. GRB 220315A: MASTER Global Robotic Net optical observations
  16. GRB 220311A: Fermi GBM observation
  17. GRB 220315A: Fermi GBM Final Real-time Localization
  18. GRB 220311A: MITSuME Akeno optical upper limits
  19. IPN triangulation of GRB 220310A
  20. GRB 220310C: Fermi GBM observation
  21. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  22. GRB 220311A: Fermi GBM Final Real-time Localization
  23. GRB 220310C: Fermi GBM Final Real-time Localization
  24. Fermi GBM Detection of GRB 220308A
  25. GRB 220308A: AGILE detection
  26. Fermi GRB 220310B: Global MASTER-Net observations report
  27. GRB 220310B: Fermi GBM Final Real-time Localization
  28. GRB 220308B: Fermi GBM detection
  29. Fermi GRB 220309A: Global MASTER-Net observations report
  30. GRB 220309A: Fermi GBM Final Real-time Localization
  31. IPN triangulation of GRB 220308A (long / very bright)
  32. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  33. IPN triangulation of GRB 220305B
  34. Fermi trigger No 668410535: Global MASTER-Net observations report
  35. GRB 220306B: Tautenburg observations
  36. GRB 220304A Fermi GBM detection
  37. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  38. GRB 220306B: AbAO optical observations, possible afterglow candidate
  39. GRB 220306B: BOOTES-1 optical upper limit
  40. GRB 220306B: Fermi GBM observation
  41. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  42. Fermi GBM Sub-Threshold Detection of GRB 220305A
  43. Fermi GRB 220306A: Global MASTER-Net observations report
  44. GRB 220306A: Fermi GBM Final Real-time Localization
  45. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  46. Fermi GRB 220305A: Global MASTER-Net observations report
  47. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  48. GRB 220305A: Fermi GBM observation
  49. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  50. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  51. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  52. Fermi GRB 220304A: Global MASTER-Net observations report
  53. GRB 220304A: BALROG localization (Fermi Trigger / GRB 220304228)
  54. GRB 220304A: Fermi GBM Final Real-time Localization
  55. IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
  56. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  57. GRB 220228A: Fermi GBM observation
  58. GRB 220228A: Fermi-LAT detection
  59. GRB 220228A: Fermi GBM Final Localization
  60. Konus-Wind detection of GRB 220222A
  61. Fermi trigger No 667737010: Global MASTER-Net observations report
  62. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  63. IceCube-220225A - IceCube observation of a high-energy neutrino candidate track-like event
  64. IPN triangulation of GRB 220222A
  65. GCN Circ.draft on GRB 220222A
  66. Fermi GRB 220223A: Global MASTER-Net observations report
  67. GRB 220223A: Fermi GBM Final Real-time Localization
  68. Fermi GRB 220222B: Global MASTER-Net observations report
  69. GRB 220222B: Fermi GBM Final Real-time Localization
  70. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  71. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  72. Fermi GRB 220222A: Global MASTER-Net observations report
  73. GRB 220222A: Fermi GBM Final Real-time Localization
  74. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  75. Konus-Wind observation of GRB 220219A
  76. IPN triangulation of GRB 220219A
  77. IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
  78. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  79. Fermi trigger No 666962499: Global MASTER-Net observations report
  80. GRB 220219A: AGILE/MCAL detection
  81. GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
  82. GRB 220219A: Fermi GBM Final Real-time Localization
  83. GRB 220211A: redshift lower limit estimating
  84. Konus-Wind detection of GRB 220209A
  85. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  86. Konus-Wind detection of GRB 220211A
  87. IPN triangulation of GRB 220209A
  88. GRB 211023A: evidence of supernova in LBT spectra
  89. GRB 220211A: Fermi GBM observation
  90. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  91. Fermi trigger No 666489765: Global MASTER-Net observations report
  92. GRB 220214A: Fermi GBM Final Real-time Localization
  93. Fermi GBM trigger 666393834/220212892 is not a GRB
  94. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  95. IPN triangulation of GRB 220211A (short)
  96. GRB 220210A: Insight-HXMT/HE detection
  97. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  98. GRB 220210A: 1.5m OSN optical upper limit
  99. GRB 220210A: Fermi GBM detection
  100. Fermi GRB 220211B: Global MASTER-Net observations report

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