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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"

11519 results found.

  1. Fermi trigger No 670501065: Global MASTER-Net observations report
  2. Fermi Gamma-ray Burst Monitor trigger 220331776/670444627 is not a GRB
  3. GRB 220331A: Fermi GBM Final Real-time Localization
  4. Fermi GRB 220330A: Global MASTER-Net observations report
  5. GRB 220330A: Fermi GBM Final Real-time Localization
  6. GRB 220320A: Detection by VZLUSAT-2
  7. GRB 220326A: Fermi GBM Final Localization
  8. GRB 220325A: 1.3m DFOT Optical upper limit
  9. GRB 220325B: Fermi GBM Final Localization
  10. Fermi GBM Sub-Threshold Detection of GRB 220325A
  11. GRB 220324A: AstroSat CZTI detection
  12. GRB 220323A: AstroSat CZTI detection
  13. GRB 220323A: AGILE/MCAL detection
  14. IPN triangulation of GRB 220320A
  15. GRB 220323A: Fermi GBM Final Real-time Localization
  16. GRB 220316A: AstroSat CZTI detection
  17. GRB 220320A: AstroSat CZTI detection
  18. GRB 220317A: Fermi GBM detection
  19. GRB 220321A: Fermi GBM Final Localization
  20. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  21. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  22. GRB 220317A: Fermi GBM Final Real-time Localization
  23. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  24. GRB 220315A: MASTER Global Robotic Net optical observations
  25. GRB 220311A: Fermi GBM observation
  26. GRB 220315A: Fermi GBM Final Real-time Localization
  27. GRB 220311A: MITSuME Akeno optical upper limits
  28. IPN triangulation of GRB 220310A
  29. GRB 220310C: Fermi GBM observation
  30. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  31. GRB 220311A: Fermi GBM Final Real-time Localization
  32. GRB 220310C: Fermi GBM Final Real-time Localization
  33. Fermi GBM Detection of GRB 220308A
  34. GRB 220308A: AGILE detection
  35. Fermi GRB 220310B: Global MASTER-Net observations report
  36. GRB 220310B: Fermi GBM Final Real-time Localization
  37. GRB 220308B: Fermi GBM detection
  38. Fermi GRB 220309A: Global MASTER-Net observations report
  39. GRB 220309A: Fermi GBM Final Real-time Localization
  40. IPN triangulation of GRB 220308A (long / very bright)
  41. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  42. IPN triangulation of GRB 220305B
  43. Fermi trigger No 668410535: Global MASTER-Net observations report
  44. GRB 220306B: Tautenburg observations
  45. GRB 220304A Fermi GBM detection
  46. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  47. GRB 220306B: AbAO optical observations, possible afterglow candidate
  48. GRB 220306B: BOOTES-1 optical upper limit
  49. GRB 220306B: Fermi GBM observation
  50. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  51. Fermi GBM Sub-Threshold Detection of GRB 220305A
  52. Fermi GRB 220306A: Global MASTER-Net observations report
  53. GRB 220306A: Fermi GBM Final Real-time Localization
  54. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  55. Fermi GRB 220305A: Global MASTER-Net observations report
  56. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  57. GRB 220305A: Fermi GBM observation
  58. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  59. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  60. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  61. Fermi GRB 220304A: Global MASTER-Net observations report
  62. GRB 220304A: BALROG localization (Fermi Trigger / GRB 220304228)
  63. GRB 220304A: Fermi GBM Final Real-time Localization
  64. IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
  65. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  66. GRB 220228A: Fermi GBM observation
  67. GRB 220228A: Fermi-LAT detection
  68. GRB 220228A: Fermi GBM Final Localization
  69. Konus-Wind detection of GRB 220222A
  70. Fermi trigger No 667737010: Global MASTER-Net observations report
  71. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  72. IceCube-220225A - IceCube observation of a high-energy neutrino candidate track-like event
  73. IPN triangulation of GRB 220222A
  74. GCN Circ.draft on GRB 220222A
  75. Fermi GRB 220223A: Global MASTER-Net observations report
  76. GRB 220223A: Fermi GBM Final Real-time Localization
  77. Fermi GRB 220222B: Global MASTER-Net observations report
  78. GRB 220222B: Fermi GBM Final Real-time Localization
  79. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  80. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  81. Fermi GRB 220222A: Global MASTER-Net observations report
  82. GRB 220222A: Fermi GBM Final Real-time Localization
  83. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  84. Konus-Wind observation of GRB 220219A
  85. IPN triangulation of GRB 220219A
  86. IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
  87. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  88. Fermi trigger No 666962499: Global MASTER-Net observations report
  89. GRB 220219A: AGILE/MCAL detection
  90. GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
  91. GRB 220219A: Fermi GBM Final Real-time Localization
  92. GRB 220211A: redshift lower limit estimating
  93. Konus-Wind detection of GRB 220209A
  94. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  95. Konus-Wind detection of GRB 220211A
  96. IPN triangulation of GRB 220209A
  97. GRB 211023A: evidence of supernova in LBT spectra
  98. GRB 220211A: Fermi GBM observation
  99. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  100. Fermi trigger No 666489765: Global MASTER-Net observations report

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