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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"

14951 results found.

  1. ZTF23aaarlti/AT2023avj: VLA radio detection
  2. GRB 230129A: Fermi GBM Final Real-time Localization
  3. GRB 230128A: Fermi GBM Final Real-time Localization
  4. ZTF23aabmzlp/AT2023azs: Zwicky Transient Facility discovery of a fast optical transient
  5. ZTF and LT Observations of AT2023avj, a Candidate Optical Afterglow
  6. GRB 230126A: Fermi GBM Final Real-time Localization
  7. Trigger 1150965: Swift detection of LS V +44 17
  8. GRB 230124A: Swift/BAT-GUANO detection outside the coded FOV
  9. GRB 230114B: Detection by VZLUSAT-2
  10. GRB 230124A: Fermi GBM Final Real-time Localization
  11. GRB 230122A: Swift/BAT-GUANO detection
  12. GRB 230123A: Zadko observatory - Gingin optical observations
  13. GRB 230123A: Swift detection of a burst
  14. IceCube-230122A - IceCube observation of a high-energy neutrino candidate track-like event
  15. Trigger 1150107: Swift detection of LS V +44 17
  16. GRB 230120A: AstroSat CZTI detection
  17. IPN triangulation of GRB 230116B (short)
  18. GRB 230119A: CALET Gamma-Ray Burst Monitor detection
  19. GRB 230116D: 3.6m DOT optical upper limit
  20. GRB 230119A: Fermi GBM Final Real-time Localization
  21. GRB 230118A: Fermi GBM Final Real-time Localization
  22. GRB 230117A: Fermi GBM Final Real-time Localization
  23. GRB 230116D: Sintez-Newton/CrAO optical afterglow detection
  24. GRB 230116D: Nanshan/NEXT optical afterglow detection
  25. GRB 230116D: Swift detection of a burst
  26. GRB 230116C: Swift detection of a burst
  27. GRB 230116B: Fermi GBM Final Real-time Localization
  28. GRB 230116A: Fermi GBM Final Real-time Localization
  29. GRB 230114A: Detection by VZLUSAT-2
  30. GRB 230114A: Fermi GBM Final Real-time Localization
  31. Trigger 1148770: Swift detection of Cyg X-1 due to Star Tracker loss of lock
  32. IceCube-230112A - IceCube observation of a high-energy neutrino candidate track-like event
  33. GRB 230112A: Fermi GBM Final Real-time Localization
  34. GRB 230111A: MAXI/GSC detection
  35. GRB 230111A: Fermi GBM Final Real-time Localization
  36. GRB 230106: AstroSat LAXPC detection
  37. GRB 221231A: 3.6m DOT optical upper limit
  38. GRB 230104A: AGILE/MCAL detection of a burst
  39. GRB 230102A: Swift/BAT-GUANO detection outside the coded FOV
  40. GRB 221230A: CALET Gamma-Ray Burst Monitor detection
  41. GRB 230102A: Detection by GRBAlpha
  42. GRB 230101A: AstroSat CZTI detection
  43. GRB 221231A: Swift-XRT afterglow detection
  44. GRB 230102A: AGILE/MCAL detection
  45. GRB 230102A: Fermi GBM Final Real-time Localization
  46. GRB 230101A: Fermi GBM Final Real-time Localization
  47. GRB 221231A: Fermi GBM Final Real-time Localization
  48. GRB 221226A: Fermi GBM detection
  49. IPN triangulation of GRB 221226A
  50. IceCube-221229A - IceCube observation of a high-energy neutrino candidate track-like event
  51. GRB 221226A: Swift/BAT-GUANO detection outside the coded FOV
  52. ZTF22acaruqr/AT2022adzb: Neil Gehrels Swift Observatory X-ray detection
  53. GRB 221228A: Fermi GBM Final Real-time Localization
  54. GRB 221226B: Swift-UVOT Detection
  55. GRB 221226A: AGILE detection
  56. GRB 221226B: VLT/X-shooter redshift and host galaxy
  57. GRB 221226B: Swift detection of a burst
  58. GRB 221226B: Fermi GBM Final Real-time Localization
  59. GRB 221226A: Fermi GBM Final Real-time Localization
  60. IceCube-221224A - IceCube observation of a high-energy neutrino candidate track-like event
  61. GRB 221223A: Fermi GBM Final Real-time Localization
  62. IceCube-221223A - IceCube observation of a high-energy neutrino candidate track-like event
  63. GRB 221221A: AGILE detection
  64. GRB 221221A: Fermi GBM Final Real-time Localization
  65. GRB 221218A: 3.6m DOT optical upper limit
  66. GRB 221216A: Detection by VZLUSAT-2
  67. GRB 221218A: BOOTES-4/MET and OSN optical upper limits
  68. GRB 221215A: Fermi GBM Detection
  69. GRB 221216A: Swift detection of a burst
  70. GRB 221216A: Fermi GBM Final Real-time Localization
  71. IceCube-221216A - IceCube observation of a high-energy neutrino candidate track-like event
  72. Konus-Wind detection of GRB 221209A
  73. IPN triangulation of GRB 221209A (long)
  74. GRB 221215B: Fermi GBM Final Real-time Localization
  75. GRB 221215A: Fermi GBM Final Real-time Localization
  76. Swift Trigger 1144538 is not a GRB
  77. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  78. GRB 221209A: CALET Gamma-Ray Burst Monitor detection
  79. GRB 221212A: Fermi GBM Final Real-time Localization
  80. GRB 221208A: AstroSat CZTI detection
  81. GRB 221211A: Fermi GBM Final Real-time Localization
  82. IceCube-221210A - IceCube observation of a high-energy neutrino candidate track-like event
  83. GRB 221209A: AstroSat CZTI detection
  84. GRB 221210A: Fermi GBM Final Real-time Localization
  85. GRB 221209B: Fermi GBM Final Real-time Localization
  86. GRB 221203C: AstroSat CZTI detection
  87. GRB 221209A: Fermi GBM Final Real-time Localization
  88. GRB 221206B: Detection by GRBAlpha
  89. GRB 221206C: Fermi GBM Final Real-time Localization
  90. GRB 221206B: Fermi GBM Final Real-time Localization
  91. GRB 221206A: Fermi GBM Final Real-time Localization
  92. GRB 221205A: Fermi GBM Final Real-time Localization
  93. GRB 221202B: Detection by VZLUSAT-2
  94. GRB 221203B: Fermi GBM Final Real-time Localization
  95. GRB 221202A: Swift/UVOT Detection
  96. GRB 221202A: VLT/FORS2 Afterglow Discovery
  97. GRB 221203A: Fermi GBM Final Real-time Localization
  98. GRB 221202A: MeerLICHT upper limits
  99. GRB 221202B: Fermi GBM Final Real-time Localization
  100. GRB 221202A: Swift detection of a burst

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