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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"

27942 results found.

  1. GRB 211118A: AstroSat CZTI detection
  2. GRB211118A: Swift/BAT-GUANO detection outside the coded FOV
  3. Search for counterpart to IceCube-211117A with ANTARES
  4. IceCube-211117A : IceCube observation of a high-energy neutrino candidate track-like event
  5. IceCube-211116A: No neutrino counterpart detected with ANTARES
  6. Konus-Wind detection of GRB 211107B
  7. IceCube-211116A : IceCube observation of a high-energy neutrino candidate track-like event
  8. GRB 211115A: CALET Gamma-Ray Burst Monitor detection
  9. GRB 211115A: MAXI/GSC detection
  10. GRB 211023A: classification and SPI-ACS/INTEGRAL registration
  11. GRB 211106A: Swift/UVOT upper limits
  12. IPN triangulation of GRB 211106A (short)
  13. GRB 211112A: Fermi GBM Final Real-time Localization
  14. GRB 211110A: AstroSat CZTI detection
  15. Short GRB 211106A: spectroscopy of galaxies in the field
  16. GRB 211110A: GECAM detection
  17. GRB 211107B: Swift-XRT afterglow detection
  18. GRB 211107A: GECAM detection
  19. GRB 211106A: Swift-XRT afterglow detection
  20. GRB 211107B: Swift-XRT observations
  21. MeerLICHT follow-up of GRB 211106A
  22. GRB 211109C: GECAM detection
  23. GRB 211107B: Swift ToO observations
  24. GRB 211109B: Fermi GBM Final Real-time Localization
  25. GRB 211109A: Fermi GBM Final Real-time Localization
  26. GRB 211107B: Swift/BAT detection
  27. Fermi GBM Sub-Threshold Detection of GRB 211106A
  28. Konus-Wind detection of GRB 211106A
  29. GRB 211107A: Fermi GBM Final Real-time Localization
  30. GRB 211106A: Swift-XRT observations
  31. GRB 211106A: Swift ToO observations
  32. GRB 211106A: Swift/BAT-GUANO candidate arcminute localization of a short burst
  33. GRB 211105A: Swift/BAT-GUANO detection outside the coded FOV
  34. GRB 211105A: GECAM detection
  35. Swift Trigger 1082569 is probably not a GRB
  36. GRB 211105A: AGILE detection of a burst
  37. GRB 211023A: optical detection by SBT in Ondrejov
  38. GRB 211104A: Fermi GBM Final Real-time Localization
  39. GRB 211024A: MITSuME Akeno optical observation
  40. GRB 211102B: GECAM detection
  41. GRB 211102B: Fermi GBM Final Real-time Localization
  42. GRB 211023B: MITSuME Akeno optical upper limits
  43. GRB 211102A: Fermi GBM Final Real-time Localization
  44. GRB 211024A: 1.3m DFOT observations
  45. GRB 211031A: Fermi GBM Final Real-time Localization
  46. IPN triangulation of GRB 211022A
  47. Konus-Wind detection of GRB 211023A
  48. AMON NuEm-211020A: No Candidate Counterparts from Swift-XRT follow up observations
  49. GRB 211024A: Swift-XRT source 4 is not an afterglow.
  50. GRB 211024A: Possible afterglow candidate from GIT
  51. GRB 211024A: Swift-XRT observations
  52. GRB 211027A: Fermi GBM Final Real-time Localization
  53. GRB 211024A: Fermi GBM detection
  54. GRB 211018A: Swift-XRT observations
  55. GRB 211025A: Optical Afterglow Detection
  56. GRB211023A: optical afterglow detection from Konkoly Observatory
  57. GRB 211024A: Swift ToO observations
  58. GRB 211024A: Swift/BAT-GUANO detection and candidate arcminute localization of a short burst
  59. GRB 211024B: Swift/UVOT detection
  60. Swift GRB 211025A: Global MASTER-Net observations report
  61. GRB 211023B: LDT Optical Afterglow Detection
  62. Correction to GCN 30965: GRB 211023A: Fermi GBM detection
  63. GRB 211025A: Swift-BAT refined analysis
  64. GRB 211025A: Swift-XRT refined Analysis
  65. GRB 211024B: CAHA 2.2m Detection; ultra-long GRB?
  66. GRB 211024B: Swift-XRT refined Analysis
  67. IPN Triangulation of GRB 211019A
  68. Possible Short GRB 211023B: CAHA 2.2m Detection
  69. GRB 211025A: Swift/UVOT Detection
  70. GRB 211023A: 1.5m OSN optical observation
  71. GRB 211024B: Swift-BAT refined analysis
  72. GRB 211025A: Enhanced Swift-XRT position
  73. GRB 211025A: Swift detection of a burst
  74. GECAM detection of a short burst probably from SGR J1555.2-5402
  75. GRB 211024B: Nanshan/NEXT optical afterglow detection
  76. GRB 211023A: OAJ Bright Afterglow Confirmation
  77. Swift GRB 211024B: Global MASTER-Net observations report
  78. GRB 211024B: Swift detection of a burst
  79. GRB 211023B: Swift-BAT refined analysis
  80. GRB 211023A: MASTER OT J045237.07+851925.2 - optical counterpart discovery
  81. GRB 211023B: BOOTES-4/MET and 1.5m OSN optical upper limit
  82. GRB 211023B: Swift/UVOT Detection
  83. GRB 211024A: GECAM detection
  84. GRB 211023B: TSHAO optical observation
  85. IceCube-211023A: No neutrino counterpart detected with ANTARES
  86. GRB 211023A: AGILE detection
  87. GRB 211022A: AstroSat CZTI detection
  88. GRB 211023B: Swift-XRT refined Analysis
  89. GRB 211023B: Enhanced Swift-XRT position
  90. GRB 211023A: Fermi GBM detection
  91. Swift GRB 211023B: Global MASTER-Net observations report
  92. GRB 211024A: Fermi GBM Final Real-time Localization
  93. GRB 211023A: Fermi-LAT detection
  94. GRB 211023B: Swift detection of a possibly short burst with an optical counterpart
  95. GRB 211023A: Fermi GBM Final Real-time Localization
  96. IceCube-211023A - IceCube observation of a high-energy neutrino candidate track-like event
  97. IPN Triangulation of GRB 210927B
  98. GRB 211022A: GECAM detection
  99. AMON IC_HAWC NuEm-211020A: No neutrino counterpart detected with ANTARES
  100. GRB 211018A: Swift ToO observations

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