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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"

27941 results found.

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

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