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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"

11547 results found.

  1. GRB 220521A: Fermi GBM detection
  2. GRB 220521A: Sintesz-Newton/CrAO optical upper limit
  3. Fermi GRB 220522A: Global MASTER-Net observations report
  4. Fermi trigger No 674868783: Global MASTER-Net observations report
  5. GRB 220522A: Fermi GBM Final Real-time Localization
  6. GRB 220521A: Fermi GBM Final Real-time Localization
  7. GRB 220514A: AstroSat CZTI detection
  8. Fermi GRB 220518B: Global MASTER-Net observations report
  9. GRB 220518B: Fermi GBM Final Real-time Localization
  10. GRB 220514A: MITSuME Akeno optical observation
  11. GRB 220514A: GRANDMA Optical Afterglow Observations
  12. Fermi trigger No 674397342: Global MASTER-Net observations report
  13. GRB 220514A: Fermi GBM observation
  14. GRB 220514A: KAIT Optical Afterglow Confirmation
  15. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  16. GRB 220514A: MeerLICHT optical afterglow candidate
  17. Fermi GRB 220514A: Global MASTER-Net observations report
  18. GRB 220514A: a long GRB detected by INTEGRAL
  19. GRB 220514A: BALROG localization (Fermi Trigger 674223877 / GRB 220514517)
  20. GRB 220514A: Fermi GBM Final Real-time Localization
  21. IceCube-220513A - IceCube observation of a high-energy neutrino candidate track-like event
  22. Fermi GRB 220513A: Global MASTER-Net observations report
  23. GRB 220513A: Fermi GBM Final Real-time Localization
  24. Konus-Wind detection of GRB 220511A
  25. GRB 220511A: Fermi GBM observation
  26. GRB 220511A: Swift-XRT observations
  27. GRB 220511A: AstroSat CZTI detection
  28. GRB 220511A: BOOTES-2/TELMA optical upper limit
  29. Fermi GRB 220512A: Global MASTER-Net observations report
  30. GRB 220512A: Fermi GBM Final Real-time Localization
  31. GRB 220511A: Swift/BAT-GUANO arcminute localization
  32. Fermi GRB 220511A: Global MASTER-Net observations report
  33. GRB 220511A: AGILE detection
  34. GRB 220511A: BALROG localization (Fermi Trigger 673969321/ GRB 220511571)
  35. GRB 220511A: Fermi GBM Final Real-time Localization
  36. GRB 220507A: AstroSat CZTI detection
  37. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  38. Fermi trigger No 673846271: Global MASTER-Net observations report
  39. IceCube-220509A - IceCube observation of a high-energy neutrino candidate track-like event
  40. GRB 220508A: Fermi GBM Final Real-time Localization
  41. GRB 220507A: Fermi GBM Final Localization
  42. Fermi trigger No 673610950: Global MASTER-Net observations report
  43. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  44. GRB 220501A: BOOTES-1 optical upper limit
  45. GRB 220501A: Fermi GBM observation
  46. IceCube-220501A - IceCube observation of a high-energy neutrino candidate track-like event
  47. GRB 220501A: GRANDMA/TJML Optical Observations
  48. GRB 220501A: Fermi GBM Final Real-time Localization
  49. GRB 220426A: Swift-XRT and UVOT observations
  50. Konus-Wind detection of GRB 220426A
  51. IPN triangulation of GRB 220426A
  52. Fermi GRB 220426A: Global MASTER-Net observations report
  53. GRB 220426A: Fermi GBM detection
  54. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  55. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  56. Fermi GRB 220426B: Global MASTER-Net observations report
  57. GRB 220426B: Fermi GBM Final Real-time Localization
  58. GRB 220426A: BALROG localization (Fermi Trigger 672648596/ GRB 220426285)
  59. Fermi-LAT Gamma-ray Observations of IceCube-220424A
  60. Fermi trigger No 672492774: Global MASTER-Net observations report
  61. IceCube-220425A - IceCube observation of a high-energy neutrino candidate track-like event
  62. IceCube-220424A - IceCube observation of a high-energy neutrino candidate track-like event
  63. Fermi trigger No 672374264: Global MASTER-Net observations report
  64. GRB 220421A: Fermi GBM observation
  65. Fermi-LAT Gamma-ray Observations of IceCube-220421A
  66. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  67. Fermi trigger No 672221879: Global MASTER-Net observations report
  68. Fermi GBM trigger 672128054/220420260 is not a GRB
  69. IceCube-220421A - IceCube observation of a high-energy neutrino candidate track-like event
  70. GRB 220418B Fermi GBM observation
  71. Fermi trigger No 672093919: Global MASTER-Net observations report
  72. GRB 220417A: Fermi GBM detection
  73. IPN triangulation of GRB 220411A
  74. GRB 220418B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  75. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  76. Fermi GRB 220418A: Global MASTER-Net observations report
  77. GRB 220418B: Fermi GBM Final Real-time Localization
  78. GRB 220418A: Fermi GBM Final Real-time Localization
  79. Fermi GRB 220417A: Global MASTER-Net observations report
  80. GRB 220417A: Fermi GBM Final Real-time Localization
  81. Fermi trigger No 671729344: Global MASTER-Net observations report
  82. Konus-Wind detection of GRB 220412B
  83. GRB 220412B: Fermi GBM observation
  84. GRB 220408B: Fermi GBM observation
  85. Konus-Wind detection of GRB 220408B
  86. GRB 220408B: Fermi-LAT detection
  87. GRB 220408A: HCT optical upper limit
  88. GRB 220411A: AstroSat CZTI detection
  89. IPN triangulation of GRB 220408B
  90. IPN triangulation of GRB 220403C
  91. Fermi GRB 220411A: Global MASTER-Net observations report
  92. GRB 220411A: BALROG localization (Fermi Trigger 671354405/ GRB 220411306)
  93. GRB 220411A: Fermi GBM Final Real-time Localization
  94. GRB 220403B: 1.3m DFOT Optical upper limit
  95. GRB 220408A: 1.3m DFOT Optical upper limit
  96. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  97. GRB 220403C: Swift-XRT observations
  98. GRB 220408A: redshift lower limit estimating
  99. GRB 220408A: NOT optical observations and archival detection
  100. GRB 220408B: AstroSat CZTI detection

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