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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"

14953 results found.

  1. GRB 220921A: DDOTI Detection of the Afterglow
  2. Konus-Wind detection of GRB 220921A
  3. GRB 220921A: Fermi GBM detection
  4. GRB 220921A: MeerLICHT afterglow observations
  5. GRB 220921A: MASTER OT inside Fermi-LAT error-box
  6. GRB 220921A: Fermi-LAT detection
  7. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  8. IceCube-220918A - IceCube observation of a high-energy neutrino candidate track-like event
  9. IceCube-220907A: No significant detection in HAWC
  10. Konus-Wind detection of GRB 220910A
  11. GRB 220910B: Fermi GBM Final Localization
  12. IPN triangulation of GRB 220910A (bright/long)
  13. GRB 220912A: AstroSat CZTI detection
  14. GRB 220831A: DECam optical counterpart follow-up
  15. GRB 220912A: Fermi GBM Final Real-time Localization
  16. IPN triangulation of GRB 220905A
  17. GRB 220910A: AstroSat CZTI detection
  18. GRB 220910A: AGILE detection
  19. GRB 220909A: Fermi GBM Final Real-time Localization
  20. GRB 220831A: Gemini-South/GMOS detection of potential optical counterpart
  21. GRB 220907A: Swift detection of a burst
  22. GRB 220907A: Fermi GBM Final Real-time Localization
  23. IceCube-220907A - IceCube observation of a high-energy neutrino candidate track-like event
  24. GRB 220905A: Fermi GBM Final Real-time Localization
  25. GRB 220831A: DECam detection of a possible optical counterpart
  26. GRB 220902A: Fermi GBM Final Real-time Localization
  27. GRB 220831C: Fermi GBM Final Localization
  28. GRB 220831A: Swift-XRT observations
  29. GRB 220831B: Fermi GBM Final Localization
  30. IceCube-220822A: No significant detection in HAWC
  31. Konus-Wind detection of GRB 220826A
  32. GRB 220827A: Fermi GBM Final Real-time Localization
  33. GRB 220826A: Lesedi optical afterglow detection
  34. GRB 220826A: Swift/UVOT Detection
  35. GRB 220826A: Swift detection of a burst with an optical counterpart
  36. GRB 220825A: Swift/BAT-GUANO detection
  37. GRB 220825A: Fermi GBM Final Localization
  38. GRB 220823A: Fermi GBM detection
  39. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  40. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  41. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  42. GRB 220821A: Fermi GBM Final Real-time Localization
  43. Konus-Wind detection of GRB 220813A
  44. GRB 220813A: Swift/UVOT Detection
  45. GRB 220813A: Swift detection of a burst with an optical counterpart
  46. GRB 220719B: Detection by VZLUSAT-2
  47. GRB 220810A: MeerLICHT detection of two afterglow candidates
  48. GRB 220810A: Fermi GBM Final Real-time Localization
  49. IceCube Astrotrack Bronze 136918_45252263.amon is likely background
  50. GRB 220806A: Swift detection of a burst
  51. GRB 220804A: Fermi GBM Final Localization
  52. GRB 220803A: AstroSat CZTI detection
  53. Konus-Wind detection of GRB 220730A (short)
  54. GRB 220730A: Fermi GBM detection
  55. GRB 220730A: Swift-XRT afterglow detection
  56. GRB 220729A: AstroSat CZTI detection
  57. GRB 220730A: Swift detection of a short hard burst
  58. GRB 220728A: Fermi GBM Final Real-time Localization
  59. GRB 220726A: Fermi GBM Final Real-time Localization
  60. GRB 220724A: Fermi GBM Final Real-time Localization
  61. GRB 220721A: Fermi GBM Final Real-time Localization
  62. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  63. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  64. GRB 220719A: Fermi GBM Final Real-time Localization
  65. GRB 220715B: Fermi GBM detection
  66. GRB 220715B: BOOTES-network optical upper limits
  67. GRB 220715B: Swift detection of a burst
  68. GRB 220715B: Fermi GBM Final Real-time Localization
  69. GRB 220715A: AGILE/MCAL detection
  70. GRB 220715A: Fermi GBM Final Real-time Localization
  71. GRB 220713A: Fermi GBM Final Localization
  72. GRB 220714B: Swift detection of a burst
  73. GRB 220714B: Fermi GBM Final Real-time Localization
  74. GRB 220714A: Possible Swift detection of a burst
  75. GRB 220710A: Swift-XRT afterglow detection
  76. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  77. Konus-Wind detection of GRB 220711C
  78. GRB 220711B: GIT optical upper limits
  79. GRB 220711B: Fermi GBM Detection
  80. GRB 220711B: Swift detection of a burst
  81. GRB 220711B: Fermi GBM Final Real-time Localization
  82. GRB 220707A: AstroSat CZTI detection
  83. GRB 220711A: Fermi GBM Final Real-time Localization
  84. Konus-Wind detection of GRB 220708B (Correction to GCN 32358)
  85. Konus-Wind detection of GRB 220708B
  86. GRB 220708B: CALET Gamma-Ray Burst Monitor detection
  87. GRB 220706A : NICER detection of re-brightening 1 day after the Swift trigger
  88. GRB 220708B: Swift-XRT afterglow detection
  89. GRB 220708A: BOOTES-5/JGT early optical upper limit
  90. GRB 220708A: Swift detection of a burst
  91. GRB 220627A: ATCA detection of radio counterpart
  92. GRB 220706A: Optical observations from NOT
  93. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  94. GRB 220702B: AstroSat CZTI detection
  95. GRB 220706A: Swift detection of a burst
  96. GRB 220702B: Fermi GBM Final Localization
  97. GRB 220702A: Fermi GBM Final Localization
  98. GRB 220705A: Fermi GBM Final Localization
  99. GRB 220701A: AbAO optical upper limit
  100. GRB 220627A: AstroSat CZTI detection

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