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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

11103 results found.

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

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