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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"

27944 results found.

  1. GRB 211219A: AGILE detection
  2. GRB 211219A: Swift/BAT-GUANO detection outside the coded FOV
  3. GRB 211219B: Fermi GBM Final Real-time Localization
  4. GRB 211219A: Fermi GBM Final Real-time Localization
  5. GRB 211216A: Fermi GBM observation
  6. IceCube-211216B: No neutrino counterpart candidates in ANTARES search
  7. GRB 211218A, MAXI J0909-041: MAXI/GSC detection
  8. IceCube-211216A: No neutrino counterpart candidates in ANTARES search
  9. GRB 211217A: GECAM detection
  10. GRB 211216A: Swift/BAT-GUANO detection outside the coded FOV
  11. IceCube-211216B - IceCube observation of a high-energy neutrino candidate track-like event
  12. GRB 211216B: GECAM detection
  13. GRB 211216B: Fermi GBM Final Real-time Localization
  14. IceCube-211216A - IceCube observation of a high-energy neutrino candidate track-like event
  15. GRB 211216A: GECAM detection
  16. GRB 211216A: Fermi GBM Final Real-time Localization
  17. GRB 211211A: Insight-HXMT/HE detection
  18. GRB 211211A - Gemini K-band detection
  19. Chandra observation of GW170817 at ~1575 days since merger (all epochs)
  20. GRB 211211A: redshift estimation and SPI-ACS/INTEGRAL detection
  21. GRB 211211A: Very fast decay observed from CAFOS/2.2mCAHA
  22. GRB 211211A: HCT and GIT optical follow up observations
  23. GRB 211211A: CALET Gamma-Ray Burst Monitor detection
  24. IceCube-211208A: No neutrino counterpart detected with ANTARES
  25. GRB 211211A: Swift/UVOT detection
  26. GRB 211211A: NOT optical spectroscopy
  27. GRB 211211B: GECAM detection
  28. GRB 211211A: Afterglow detection from CAFOS/2.2m CAHA
  29. Swift GRB 211211A: Global MASTER-Net observations report
  30. GRB 211212B: Fermi GBM Final Real-time Localization
  31. GRB 211211A: LCO Optical Observations
  32. GRB 211211A: Nanshan/NEXT optical observations
  33. GRB 211211A: Swift-XRT refined Analysis
  34. GRB 211212A: Fermi GBM Final Real-time Localization
  35. GRB 211211A: Fermi GBM observation
  36. GRB 211211A: Swift-BAT refined analysis
  37. GRB 211211B: Fermi GBM Final Real-time Localization
  38. GRB 211211A: Enhanced Swift-XRT position
  39. GRB 211207A: Swift/UVOT Detection
  40. GRB 211211A: KAIT Optical Afterglow Candidate
  41. GRB 211211A: Swift detection of a bright burst
  42. GRB 211211A: Fermi GBM Final Real-time Localization
  43. IceCube-211208A: No significant detection in HAWC
  44. AMON NuEm-211020A: No neutrino counterpart detected with ANTARES
  45. IceCube-211208A - IceCube observation of a high-energy neutrino candidate track-like event
  46. GRB 211207A: Swift-BAT refined analysis
  47. GRB 211207A: VLT/X-shooter redshift
  48. GRB 211204C: Fermi GBM detection
  49. GRB 211207A: Swift-XRT refined Analysis
  50. GRB 211207A: Enhanced Swift-XRT position
  51. Swift GRB 211207A: Global MASTER-Net observations report
  52. GRB 211207A: Swift detection of a burst with an optical counterpart
  53. GRB 211206A: AstroSat CZTI detection
  54. GRB 211206B: AstroSat CZTI detection
  55. GRB 211204C: AstroSat CZTI detection
  56. IPN triangulation of GRB 211204C
  57. GRB 211206A: Swift/BAT-GUANO detection outside the coded FOV
  58. GRB 211206A: AGILE/MCAL detection of a burst
  59. GRB 211204C: Swift/BAT-GUANO detection outside the coded FOV
  60. GRB 211204C: GECAM detection
  61. GRB 211204C: Fermi GBM Final Real-time Localization
  62. GRB 211204B: Fermi GBM Final Real-time Localization
  63. GRB 211204A: Fermi GBM Final Real-time Localization
  64. GRB 211124A: Fermi GBM Observation
  65. Swift Trigger 1086826 (possible GRB 211203A) is likely not an astrophysical event
  66. Swift GRB 211203A: Global MASTER-Net observations report
  67. Fermi GBM Upper limits for GRB 211203A
  68. Konus-Wind detection of GRB 211130A
  69. GRB 211203A: Swift detection of a burst
  70. GRB 211201A: GECAM detection
  71. GRB 211201A: Swift/BAT-GUANO detection likely outside the coded FOV
  72. GRB 211201A: Fermi GBM Final Real-time Localization
  73. IceCube-211125A: No significant detection in HAWC
  74. GRB 211130A: Fermi GBM Final Real-time Localization
  75. GRB 211106A: GECAM detection
  76. GRB 211129A: Swift-BAT refined analysis
  77. GRB 211129A: Swift-XRT refined Analysis
  78. GRB 211129A: Swift/UVOT Upper Limits
  79. GRB 211129A: Fermi GBM observation
  80. Swift GRB 211129A: Global MASTER-Net observations report
  81. GRB 211129A: Nanshan/NEXT optical upper limit
  82. GRB 211129A: Enhanced Swift-XRT position
  83. IPN triangulation of GRB 211118A
  84. GRB 211129A: MITSuME Akeno optical upper limits
  85. GRB 211129A: Swift detection of a burst
  86. GRB 211120548: Fermi GBM observation
  87. Konus-Wind detection of GRB 211120A
  88. IPN triangulation of GRB 211120A
  89. IceCube-211125A: No neutrino counterpart detected with ANTARES
  90. Chandra observations of GRB 210905A
  91. IceCube-211125A: IceCube observation of a high-energy neutrino candidate track-like event
  92. GRB 211118A: Fermi GBM detection
  93. IPN triangulation of GRB 211124A (short)
  94. GRB 211124A: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  95. HAWC-211123A: No neutrino counterpart detected with ANTARES
  96. IceCube-211123A - IceCube observation of a high-energy neutrino candidate track-like event
  97. Trigger_21473: Tiled Swift observations
  98. GRB 211023B: LBT likely spectroscopic redshift of the host galaxy
  99. GRB 211120A: AGILE detection
  100. GRB 211120A: AstroSat CZTI detection

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