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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"

11617 results found.

  1. GRB 220331A: Fermi GBM Final Real-time Localization
  2. Fermi GRB 220330A: Global MASTER-Net observations report
  3. GRB 220330A: Fermi GBM Final Real-time Localization
  4. GRB 220320A: Detection by VZLUSAT-2
  5. GRB 220326A: Fermi GBM Final Localization
  6. GRB 220325A: 1.3m DFOT Optical upper limit
  7. GRB 220325B: Fermi GBM Final Localization
  8. Fermi GBM Sub-Threshold Detection of GRB 220325A
  9. GRB 220324A: AstroSat CZTI detection
  10. GRB 220323A: AstroSat CZTI detection
  11. GRB 220323A: AGILE/MCAL detection
  12. IPN triangulation of GRB 220320A
  13. GRB 220323A: Fermi GBM Final Real-time Localization
  14. GRB 220316A: AstroSat CZTI detection
  15. GRB 220320A: AstroSat CZTI detection
  16. GRB 220317A: Fermi GBM detection
  17. GRB 220321A: Fermi GBM Final Localization
  18. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  19. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  20. GRB 220317A: Fermi GBM Final Real-time Localization
  21. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  22. GRB 220315A: MASTER Global Robotic Net optical observations
  23. GRB 220311A: Fermi GBM observation
  24. GRB 220315A: Fermi GBM Final Real-time Localization
  25. GRB 220311A: MITSuME Akeno optical upper limits
  26. IPN triangulation of GRB 220310A
  27. GRB 220310C: Fermi GBM observation
  28. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  29. GRB 220311A: Fermi GBM Final Real-time Localization
  30. GRB 220310C: Fermi GBM Final Real-time Localization
  31. Fermi GBM Detection of GRB 220308A
  32. GRB 220308A: AGILE detection
  33. Fermi GRB 220310B: Global MASTER-Net observations report
  34. GRB 220310B: Fermi GBM Final Real-time Localization
  35. GRB 220308B: Fermi GBM detection
  36. Fermi GRB 220309A: Global MASTER-Net observations report
  37. GRB 220309A: Fermi GBM Final Real-time Localization
  38. IPN triangulation of GRB 220308A (long / very bright)
  39. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  40. IPN triangulation of GRB 220305B
  41. Fermi trigger No 668410535: Global MASTER-Net observations report
  42. GRB 220306B: Tautenburg observations
  43. GRB 220304A Fermi GBM detection
  44. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  45. GRB 220306B: AbAO optical observations, possible afterglow candidate
  46. GRB 220306B: BOOTES-1 optical upper limit
  47. GRB 220306B: Fermi GBM observation
  48. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  49. Fermi GBM Sub-Threshold Detection of GRB 220305A
  50. Fermi GRB 220306A: Global MASTER-Net observations report
  51. GRB 220306A: Fermi GBM Final Real-time Localization
  52. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  53. Fermi GRB 220305A: Global MASTER-Net observations report
  54. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  55. GRB 220305A: Fermi GBM observation
  56. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  57. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  58. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  59. Fermi GRB 220304A: Global MASTER-Net observations report
  60. GRB 220304A: BALROG localization (Fermi Trigger / GRB 220304228)
  61. GRB 220304A: Fermi GBM Final Real-time Localization
  62. IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
  63. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  64. GRB 220228A: Fermi GBM observation
  65. GRB 220228A: Fermi-LAT detection
  66. GRB 220228A: Fermi GBM Final Localization
  67. Konus-Wind detection of GRB 220222A
  68. Fermi trigger No 667737010: Global MASTER-Net observations report
  69. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  70. IceCube-220225A - IceCube observation of a high-energy neutrino candidate track-like event
  71. IPN triangulation of GRB 220222A
  72. GCN Circ.draft on GRB 220222A
  73. Fermi GRB 220223A: Global MASTER-Net observations report
  74. GRB 220223A: Fermi GBM Final Real-time Localization
  75. Fermi GRB 220222B: Global MASTER-Net observations report
  76. GRB 220222B: Fermi GBM Final Real-time Localization
  77. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  78. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  79. Fermi GRB 220222A: Global MASTER-Net observations report
  80. GRB 220222A: Fermi GBM Final Real-time Localization
  81. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  82. Konus-Wind observation of GRB 220219A
  83. IPN triangulation of GRB 220219A
  84. IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
  85. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  86. Fermi trigger No 666962499: Global MASTER-Net observations report
  87. GRB 220219A: AGILE/MCAL detection
  88. GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
  89. GRB 220219A: Fermi GBM Final Real-time Localization
  90. GRB 220211A: redshift lower limit estimating
  91. Konus-Wind detection of GRB 220209A
  92. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  93. Konus-Wind detection of GRB 220211A
  94. IPN triangulation of GRB 220209A
  95. GRB 211023A: evidence of supernova in LBT spectra
  96. GRB 220211A: Fermi GBM observation
  97. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  98. Fermi trigger No 666489765: Global MASTER-Net observations report
  99. GRB 220214A: Fermi GBM Final Real-time Localization
  100. Fermi GBM trigger 666393834/220212892 is not a GRB

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