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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"

11621 results found.

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

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