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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"

14984 results found.

  1. GRB 211222A: Fermi GBM Final Real-time Localization
  2. GRB 211221A: BOOTES-4/MET optical upper limit
  3. GRB 211221A: MeerLICHT optical limits
  4. GRB 211221A: Swift detection of a burst
  5. IceCube-211216B: No significant detection in HAWC
  6. IceCube-211216A: No significant detection in HAWC
  7. GRB 211219A: AGILE detection
  8. GRB 211219A: Swift/BAT-GUANO detection outside the coded FOV
  9. GRB 211219B: Fermi GBM Final Real-time Localization
  10. GRB 211219A: Fermi GBM Final Real-time Localization
  11. IceCube-211216B: No neutrino counterpart candidates in ANTARES search
  12. GRB 211218A, MAXI J0909-041: MAXI/GSC detection
  13. IceCube-211216A: No neutrino counterpart candidates in ANTARES search
  14. GRB 211217A: GECAM detection
  15. GRB 211216A: Swift/BAT-GUANO detection outside the coded FOV
  16. IceCube-211216B - IceCube observation of a high-energy neutrino candidate track-like event
  17. GRB 211216B: GECAM detection
  18. GRB 211216B: Fermi GBM Final Real-time Localization
  19. IceCube-211216A - IceCube observation of a high-energy neutrino candidate track-like event
  20. GRB 211216A: GECAM detection
  21. GRB 211216A: Fermi GBM Final Real-time Localization
  22. GRB 211211A: Insight-HXMT/HE detection
  23. GRB 211211A - Gemini K-band detection
  24. Chandra observation of GW170817 at ~1575 days since merger (all epochs)
  25. GRB 211211A: redshift estimation and SPI-ACS/INTEGRAL detection
  26. GRB 211211A: Very fast decay observed from CAFOS/2.2mCAHA
  27. GRB 211211A: CALET Gamma-Ray Burst Monitor detection
  28. IceCube-211208A: No neutrino counterpart detected with ANTARES
  29. GRB 211211A: Swift/UVOT detection
  30. GRB 211211A: NOT optical spectroscopy
  31. GRB 211211B: GECAM detection
  32. GRB 211211A: Afterglow detection from CAFOS/2.2m CAHA
  33. GRB 211212B: Fermi GBM Final Real-time Localization
  34. GRB 211212A: Fermi GBM Final Real-time Localization
  35. GRB 211211B: Fermi GBM Final Real-time Localization
  36. GRB 211207A: Swift/UVOT Detection
  37. GRB 211211A: Swift detection of a bright burst
  38. GRB 211211A: Fermi GBM Final Real-time Localization
  39. IceCube-211208A: No significant detection in HAWC
  40. AMON NuEm-211020A: No neutrino counterpart detected with ANTARES
  41. IceCube-211208A - IceCube observation of a high-energy neutrino candidate track-like event
  42. GRB 211207A: VLT/X-shooter redshift
  43. GRB 211204C: Fermi GBM detection
  44. GRB 211207A: Swift detection of a burst with an optical counterpart
  45. GRB 211206A: AstroSat CZTI detection
  46. GRB 211206B: AstroSat CZTI detection
  47. GRB 211204C: AstroSat CZTI detection
  48. IPN triangulation of GRB 211204C
  49. GRB 211206A: Swift/BAT-GUANO detection outside the coded FOV
  50. GRB 211206A: AGILE/MCAL detection of a burst
  51. GRB 211204C: Swift/BAT-GUANO detection outside the coded FOV
  52. GRB 211204C: GECAM detection
  53. GRB 211204C: Fermi GBM Final Real-time Localization
  54. GRB 211204B: Fermi GBM Final Real-time Localization
  55. GRB 211204A: Fermi GBM Final Real-time Localization
  56. Konus-Wind detection of GRB 211130A
  57. GRB 211203A: Swift detection of a burst
  58. GRB 211201A: GECAM detection
  59. GRB 211201A: Swift/BAT-GUANO detection likely outside the coded FOV
  60. GRB 211201A: Fermi GBM Final Real-time Localization
  61. IceCube-211125A: No significant detection in HAWC
  62. GRB 211130A: Fermi GBM Final Real-time Localization
  63. GRB 211106A: GECAM detection
  64. IPN triangulation of GRB 211118A
  65. GRB 211129A: Swift detection of a burst
  66. Konus-Wind detection of GRB 211120A
  67. IPN triangulation of GRB 211120A
  68. IceCube-211125A: No neutrino counterpart detected with ANTARES
  69. IceCube-211125A: IceCube observation of a high-energy neutrino candidate track-like event
  70. GRB 211118A: Fermi GBM detection
  71. IPN triangulation of GRB 211124A (short)
  72. GRB 211124A: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  73. HAWC-211123A: No neutrino counterpart detected with ANTARES
  74. IceCube-211123A - IceCube observation of a high-energy neutrino candidate track-like event
  75. GRB 211023B: LBT likely spectroscopic redshift of the host galaxy
  76. GRB 211120A: AGILE detection
  77. GRB 211120A: AstroSat CZTI detection
  78. GRB 211120B: Swift/BAT-GUANO detection outside the coded FOV
  79. GRB 211120A: GECAM detection
  80. GRB 211118A: AstroSat CZTI detection
  81. GRB211118A: Swift/BAT-GUANO detection outside the coded FOV
  82. Search for counterpart to IceCube-211117A with ANTARES
  83. IceCube-211117A : IceCube observation of a high-energy neutrino candidate track-like event
  84. IceCube-211116A: No neutrino counterpart detected with ANTARES
  85. Konus-Wind detection of GRB 211107B
  86. IceCube-211116A : IceCube observation of a high-energy neutrino candidate track-like event
  87. GRB 211115A: CALET Gamma-Ray Burst Monitor detection
  88. GRB 211115A: MAXI/GSC detection
  89. GRB 211023A: classification and SPI-ACS/INTEGRAL registration
  90. IPN triangulation of GRB 211106A (short)
  91. GRB 211112A: Fermi GBM Final Real-time Localization
  92. GRB 211110A: AstroSat CZTI detection
  93. Short GRB 211106A: spectroscopy of galaxies in the field
  94. GRB 211110A: GECAM detection
  95. GRB 211107B: Swift-XRT afterglow detection
  96. GRB 211107A: GECAM detection
  97. GRB 211106A: Swift-XRT afterglow detection
  98. MeerLICHT follow-up of GRB 211106A
  99. GRB 211109C: GECAM detection
  100. GRB 211109B: Fermi GBM Final Real-time Localization

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