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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"

14975 results found.

  1. GRB 211219A: Fermi GBM Final Real-time Localization
  2. IceCube-211216B: No neutrino counterpart candidates in ANTARES search
  3. GRB 211218A, MAXI J0909-041: MAXI/GSC detection
  4. IceCube-211216A: No neutrino counterpart candidates in ANTARES search
  5. GRB 211217A: GECAM detection
  6. GRB 211216A: Swift/BAT-GUANO detection outside the coded FOV
  7. IceCube-211216B - IceCube observation of a high-energy neutrino candidate track-like event
  8. GRB 211216B: GECAM detection
  9. GRB 211216B: Fermi GBM Final Real-time Localization
  10. IceCube-211216A - IceCube observation of a high-energy neutrino candidate track-like event
  11. GRB 211216A: GECAM detection
  12. GRB 211216A: Fermi GBM Final Real-time Localization
  13. GRB 211211A: Insight-HXMT/HE detection
  14. GRB 211211A - Gemini K-band detection
  15. Chandra observation of GW170817 at ~1575 days since merger (all epochs)
  16. GRB 211211A: redshift estimation and SPI-ACS/INTEGRAL detection
  17. GRB 211211A: Very fast decay observed from CAFOS/2.2mCAHA
  18. GRB 211211A: CALET Gamma-Ray Burst Monitor detection
  19. IceCube-211208A: No neutrino counterpart detected with ANTARES
  20. GRB 211211A: Swift/UVOT detection
  21. GRB 211211A: NOT optical spectroscopy
  22. GRB 211211B: GECAM detection
  23. GRB 211211A: Afterglow detection from CAFOS/2.2m CAHA
  24. GRB 211212B: Fermi GBM Final Real-time Localization
  25. GRB 211212A: Fermi GBM Final Real-time Localization
  26. GRB 211211B: Fermi GBM Final Real-time Localization
  27. GRB 211207A: Swift/UVOT Detection
  28. GRB 211211A: Swift detection of a bright burst
  29. GRB 211211A: Fermi GBM Final Real-time Localization
  30. IceCube-211208A: No significant detection in HAWC
  31. AMON NuEm-211020A: No neutrino counterpart detected with ANTARES
  32. IceCube-211208A - IceCube observation of a high-energy neutrino candidate track-like event
  33. GRB 211207A: VLT/X-shooter redshift
  34. GRB 211204C: Fermi GBM detection
  35. GRB 211207A: Swift detection of a burst with an optical counterpart
  36. GRB 211206A: AstroSat CZTI detection
  37. GRB 211206B: AstroSat CZTI detection
  38. GRB 211204C: AstroSat CZTI detection
  39. IPN triangulation of GRB 211204C
  40. GRB 211206A: Swift/BAT-GUANO detection outside the coded FOV
  41. GRB 211206A: AGILE/MCAL detection of a burst
  42. GRB 211204C: Swift/BAT-GUANO detection outside the coded FOV
  43. GRB 211204C: GECAM detection
  44. GRB 211204C: Fermi GBM Final Real-time Localization
  45. GRB 211204B: Fermi GBM Final Real-time Localization
  46. GRB 211204A: Fermi GBM Final Real-time Localization
  47. Konus-Wind detection of GRB 211130A
  48. GRB 211203A: Swift detection of a burst
  49. GRB 211201A: GECAM detection
  50. GRB 211201A: Swift/BAT-GUANO detection likely outside the coded FOV
  51. GRB 211201A: Fermi GBM Final Real-time Localization
  52. IceCube-211125A: No significant detection in HAWC
  53. GRB 211130A: Fermi GBM Final Real-time Localization
  54. GRB 211106A: GECAM detection
  55. IPN triangulation of GRB 211118A
  56. GRB 211129A: Swift detection of a burst
  57. Konus-Wind detection of GRB 211120A
  58. IPN triangulation of GRB 211120A
  59. IceCube-211125A: No neutrino counterpart detected with ANTARES
  60. IceCube-211125A: IceCube observation of a high-energy neutrino candidate track-like event
  61. GRB 211118A: Fermi GBM detection
  62. IPN triangulation of GRB 211124A (short)
  63. GRB 211124A: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  64. HAWC-211123A: No neutrino counterpart detected with ANTARES
  65. IceCube-211123A - IceCube observation of a high-energy neutrino candidate track-like event
  66. GRB 211023B: LBT likely spectroscopic redshift of the host galaxy
  67. GRB 211120A: AGILE detection
  68. GRB 211120A: AstroSat CZTI detection
  69. GRB 211120B: Swift/BAT-GUANO detection outside the coded FOV
  70. GRB 211120A: GECAM detection
  71. GRB 211118A: AstroSat CZTI detection
  72. GRB211118A: Swift/BAT-GUANO detection outside the coded FOV
  73. Search for counterpart to IceCube-211117A with ANTARES
  74. IceCube-211117A : IceCube observation of a high-energy neutrino candidate track-like event
  75. IceCube-211116A: No neutrino counterpart detected with ANTARES
  76. Konus-Wind detection of GRB 211107B
  77. IceCube-211116A : IceCube observation of a high-energy neutrino candidate track-like event
  78. GRB 211115A: CALET Gamma-Ray Burst Monitor detection
  79. GRB 211115A: MAXI/GSC detection
  80. GRB 211023A: classification and SPI-ACS/INTEGRAL registration
  81. IPN triangulation of GRB 211106A (short)
  82. GRB 211112A: Fermi GBM Final Real-time Localization
  83. GRB 211110A: AstroSat CZTI detection
  84. Short GRB 211106A: spectroscopy of galaxies in the field
  85. GRB 211110A: GECAM detection
  86. GRB 211107B: Swift-XRT afterglow detection
  87. GRB 211107A: GECAM detection
  88. GRB 211106A: Swift-XRT afterglow detection
  89. MeerLICHT follow-up of GRB 211106A
  90. GRB 211109C: GECAM detection
  91. GRB 211109B: Fermi GBM Final Real-time Localization
  92. GRB 211109A: Fermi GBM Final Real-time Localization
  93. GRB 211107B: Swift/BAT detection
  94. Fermi GBM Sub-Threshold Detection of GRB 211106A
  95. Konus-Wind detection of GRB 211106A
  96. GRB 211107A: Fermi GBM Final Real-time Localization
  97. GRB 211106A: Swift/BAT-GUANO candidate arcminute localization of a short burst
  98. GRB 211105A: Swift/BAT-GUANO detection outside the coded FOV
  99. GRB 211105A: GECAM detection
  100. Swift Trigger 1082569 is probably not a GRB

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