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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"

14967 results found.

  1. IPN triangulation of GRB 220411A
  2. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  3. GRB 220418B: Fermi GBM Final Real-time Localization
  4. GRB 220418A: Fermi GBM Final Real-time Localization
  5. GRB 220417A: Fermi GBM Final Real-time Localization
  6. Konus-Wind detection of GRB 220412B
  7. Konus-Wind detection of GRB 220403C
  8. Konus-Wind detection of GRB 220408B
  9. GRB 220412A: BOOTES-network optical upper limits
  10. GRB 220412B: BOOTES-1 optical upper limit
  11. GRB 220408B: Fermi-LAT detection
  12. GRB 220412B: Swift detection of a short burst
  13. GRB 220412A: Swift detection of a burst
  14. GRB 220411A: AstroSat CZTI detection
  15. IPN triangulation of GRB 220408B
  16. IPN triangulation of GRB 220403C
  17. GRB 220403B: Swift/UVOT Detection
  18. GRB 220408A: Lowell Discovery Telescope Optical Observations
  19. GRB 220411A: Fermi GBM Final Real-time Localization
  20. GRB 220408A: RATIR Optical and NIR Observations
  21. GRB 220408A: 1.3m DFOT Optical upper limit
  22. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  23. GRB 220408A: NOT optical observations and archival detection
  24. GRB 220408B: AstroSat CZTI detection
  25. GRB 220408A: LCO Optical Afterglow Detection
  26. GRB 220408A: BOOTES-5/JGT optical afterglow detection
  27. GRB 220408A: Swift/UVOT Detection
  28. GRB 220408B: Fermi GBM Final Localization
  29. GRB 220408A: KAIT Optical Observations
  30. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  31. GRB 220408A: Fermi GBM Final Real-time Localization
  32. GRB 220403B: 1.5m OSN optical observation
  33. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  34. GRB 220405A: Fermi GBM Final Localization
  35. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  36. GRB 220404B: Fermi GBM Final Real-time Localization
  37. GRB 220403B: Fermi GBM detection
  38. GRB 220404A: Swift detection of a burst
  39. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  40. GRB 220403B: optical detection by D50
  41. GRB 220403B: Swift detection of a burst with an optical counterpart
  42. GRB 220403A: Fermi GBM Final Real-time Localization
  43. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  44. Swift Trigger 1100848 is likely not a GRB
  45. GRB 220401B: Fermi GBM Final Real-time Localization
  46. GRB 220401A: Fermi GBM Final Localization
  47. GRB 220331A: Fermi GBM Final Real-time Localization
  48. GRB 220330A: Fermi GBM Final Real-time Localization
  49. ZTF22aaajecp/AT2022cmc: 1.3m DFOT Optical observations
  50. GRB 220320A: Detection by VZLUSAT-2
  51. Konus-Wind observation of GRB 220320A
  52. GRB 211024B: Host galaxy redshift from X-shooter/VLT
  53. GRB 220326A: Fermi GBM Final Localization
  54. GRB 220325B: Fermi GBM Final Localization
  55. Fermi GBM Sub-Threshold Detection of GRB 220325A
  56. GRB 220324A: AstroSat CZTI detection
  57. GRB 220325A: Swift detection of a burst
  58. GRB 220323A: AstroSat CZTI detection
  59. GRB 220323A: AGILE/MCAL detection
  60. IPN triangulation of GRB 220320A
  61. GRB 220323A: Fermi GBM Final Real-time Localization
  62. GRB 220316A: AstroSat CZTI detection
  63. GRB 220320A: AstroSat CZTI detection
  64. GRB 220317A: Fermi GBM detection
  65. GRB 220321A: Fermi GBM Final Localization
  66. GRB 220319A: LCO Optical Upper Limit
  67. GRB 220319A: Swift detection of a burst
  68. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  69. GRB 220317A: Fermi GBM Final Real-time Localization
  70. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  71. GRB 220315A: Fermi GBM Final Real-time Localization
  72. IPN triangulation of GRB 220310A
  73. GRB 210722A: TAROT Reunion observatory optical light curve
  74. GRB 210222B: TAROT Reunion observatory optical light curve
  75. GRB 201021C: TAROT Reunion observatory optical light curve
  76. Konus-Wind detection of GRB 220310A
  77. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  78. Integral GRB220311.69: Global MASTER-Net OT detection
  79. GRB 220311A: Fermi GBM Final Real-time Localization
  80. GRB 220310C: Fermi GBM Final Real-time Localization
  81. Fermi GBM Detection of GRB 220308A
  82. GRB 220308A: AGILE detection
  83. GRB 220310A: MASTER optical counterpart detection
  84. GRB 220310A: CALET Gamma-Ray Burst Monitor detection
  85. GRB 220310B: Fermi GBM Final Real-time Localization
  86. GRB 220308B: Fermi GBM detection
  87. GRB 220310A: MAXI/GSC detection
  88. Konus-Wind detection of GRB 220308A
  89. IceCube-220306A: No significant detection in HAWC
  90. IceCube-220303A: No significant detection in HAWC
  91. CALET Gamma-Ray Burst Monitor detection of GRB 220308A and its possible precursor
  92. GRB 220309A: Fermi GBM Final Real-time Localization
  93. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  94. GRB 220304A Fermi GBM detection
  95. GRB 220306B: BOOTES-1 optical upper limit
  96. GRB 220306B: Swift detection of a burst
  97. Fermi GBM Sub-Threshold Detection of GRB 220305A
  98. GRB 220306A: Fermi GBM Final Real-time Localization
  99. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  100. GRB 220305A: Swift detection of a burst

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