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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"

11620 results found.

  1. GRB 220511A: BOOTES-2/TELMA optical upper limit
  2. Fermi GRB 220512A: Global MASTER-Net observations report
  3. GRB 220512A: Fermi GBM Final Real-time Localization
  4. GRB 220511A: Swift/BAT-GUANO arcminute localization
  5. Fermi GRB 220511A: Global MASTER-Net observations report
  6. GRB 220511A: AGILE detection
  7. GRB 220511A: BALROG localization (Fermi Trigger 673969321/ GRB 220511571)
  8. GRB 220511A: Fermi GBM Final Real-time Localization
  9. GRB 220507A: AstroSat CZTI detection
  10. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  11. Fermi trigger No 673846271: Global MASTER-Net observations report
  12. IceCube-220509A - IceCube observation of a high-energy neutrino candidate track-like event
  13. GRB 220508A: Fermi GBM Final Real-time Localization
  14. GRB 220507A: Fermi GBM Final Localization
  15. Fermi trigger No 673610950: Global MASTER-Net observations report
  16. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  17. GRB 220501A: BOOTES-1 optical upper limit
  18. GRB 220501A: Fermi GBM observation
  19. IceCube-220501A - IceCube observation of a high-energy neutrino candidate track-like event
  20. GRB 220501A: GRANDMA/TJML Optical Observations
  21. GRB 220501A: Fermi GBM Final Real-time Localization
  22. GRB 220426A: Swift-XRT and UVOT observations
  23. Konus-Wind detection of GRB 220426A
  24. IPN triangulation of GRB 220426A
  25. Fermi GRB 220426A: Global MASTER-Net observations report
  26. GRB 220426A: Fermi GBM detection
  27. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  28. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  29. Fermi GRB 220426B: Global MASTER-Net observations report
  30. GRB 220426B: Fermi GBM Final Real-time Localization
  31. GRB 220426A: BALROG localization (Fermi Trigger 672648596/ GRB 220426285)
  32. Fermi-LAT Gamma-ray Observations of IceCube-220424A
  33. Fermi trigger No 672492774: Global MASTER-Net observations report
  34. IceCube-220425A - IceCube observation of a high-energy neutrino candidate track-like event
  35. IceCube-220424A - IceCube observation of a high-energy neutrino candidate track-like event
  36. Fermi trigger No 672374264: Global MASTER-Net observations report
  37. GRB 220421A: Fermi GBM observation
  38. Fermi-LAT Gamma-ray Observations of IceCube-220421A
  39. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  40. Fermi trigger No 672221879: Global MASTER-Net observations report
  41. Fermi GBM trigger 672128054/220420260 is not a GRB
  42. IceCube-220421A - IceCube observation of a high-energy neutrino candidate track-like event
  43. GRB 220418B Fermi GBM observation
  44. Fermi trigger No 672093919: Global MASTER-Net observations report
  45. GRB 220417A: Fermi GBM detection
  46. IPN triangulation of GRB 220411A
  47. GRB 220418B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  48. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  49. Fermi GRB 220418A: Global MASTER-Net observations report
  50. GRB 220418B: Fermi GBM Final Real-time Localization
  51. GRB 220418A: Fermi GBM Final Real-time Localization
  52. Fermi GRB 220417A: Global MASTER-Net observations report
  53. GRB 220417A: Fermi GBM Final Real-time Localization
  54. Fermi trigger No 671729344: Global MASTER-Net observations report
  55. Konus-Wind detection of GRB 220412B
  56. GRB 220412B: Fermi GBM observation
  57. GRB 220408B: Fermi GBM observation
  58. Konus-Wind detection of GRB 220408B
  59. GRB 220408B: Fermi-LAT detection
  60. GRB 220408A: HCT optical upper limit
  61. GRB 220411A: AstroSat CZTI detection
  62. IPN triangulation of GRB 220408B
  63. IPN triangulation of GRB 220403C
  64. Fermi GRB 220411A: Global MASTER-Net observations report
  65. GRB 220411A: BALROG localization (Fermi Trigger 671354405/ GRB 220411306)
  66. GRB 220411A: Fermi GBM Final Real-time Localization
  67. GRB 220403B: 1.3m DFOT Optical upper limit
  68. GRB 220408A: 1.3m DFOT Optical upper limit
  69. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  70. GRB 220403C: Swift-XRT observations
  71. GRB 220408A: redshift lower limit estimating
  72. GRB 220408A: NOT optical observations and archival detection
  73. GRB 220408B: AstroSat CZTI detection
  74. GRB 220408A: LCO Optical Afterglow Detection
  75. GRB 220403C: Swift ToO observations
  76. GRB 220408A: BOOTES-5/JGT optical afterglow detection
  77. Fermi GRB 220408B: Global MASTER-Net observations report
  78. GRB 220408A: GIT optical upper limit
  79. GRB 220408A: Fermi GBM observation
  80. GRB 220408B: Fermi GBM Final Localization
  81. GRB 220408A: Xinglong-2.16m optical upper limit
  82. Chandra upper limit at the location of GRB 220408A
  83. GRB 220408A: KAIT Optical Observations
  84. Fermi GRB 220408A: Global MASTER-Net observations report
  85. GRB 220408A: Fermi GBM Final Real-time Localization
  86. Fermi-LAT Gamma-ray Observations of IceCube-220405B
  87. GRB 220403B: 1.5m OSN optical observation
  88. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  89. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  90. GRB 220405A: Fermi GBM Final Localization
  91. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  92. GRB 220404B: Fermi GBM Final Real-time Localization
  93. GRB 220403B: Fermi GBM detection
  94. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  95. Fermi GRB 220403A: Global MASTER-Net observations report
  96. GRB 220403A: Fermi GBM Final Real-time Localization
  97. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  98. GRB 220401A: Fermi GBM observation
  99. Fermi GRB 220401B: Global MASTER-Net observations report
  100. GRB 220401B: Fermi GBM Final Real-time Localization

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