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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"

14980 results found.

  1. GRB 211107A: Fermi GBM Final Real-time Localization
  2. GRB 211106A: Swift/BAT-GUANO candidate arcminute localization of a short burst
  3. GRB 211105A: Swift/BAT-GUANO detection outside the coded FOV
  4. GRB 211105A: GECAM detection
  5. Swift Trigger 1082569 is probably not a GRB
  6. GRB 211105A: AGILE detection of a burst
  7. GRB 211023A: optical detection by SBT in Ondrejov
  8. GRB 211104A: Fermi GBM Final Real-time Localization
  9. GRB 211024A: MITSuME Akeno optical observation
  10. GRB 211102B: GECAM detection
  11. GRB 211102B: Fermi GBM Final Real-time Localization
  12. GRB 211102A: Fermi GBM Final Real-time Localization
  13. GRB 211031A: Fermi GBM Final Real-time Localization
  14. IPN triangulation of GRB 211022A
  15. Konus-Wind detection of GRB 211023A
  16. GRB 211027A: Fermi GBM Final Real-time Localization
  17. GRB 211024A: Fermi GBM detection
  18. GRB 211025A: Optical Afterglow Detection
  19. GRB211023A: optical afterglow detection from Konkoly Observatory
  20. GRB 211024A: Swift/BAT-GUANO detection and candidate arcminute localization of a short burst
  21. GRB 211024B: Swift/UVOT detection
  22. GRB 211023B: LDT Optical Afterglow Detection
  23. Correction to GCN 30965: GRB 211023A: Fermi GBM detection
  24. GRB 211024B: CAHA 2.2m Detection; ultra-long GRB?
  25. IPN Triangulation of GRB 211019A
  26. Possible Short GRB 211023B: CAHA 2.2m Detection
  27. GRB 211025A: Swift/UVOT Detection
  28. GRB 211023A: 1.5m OSN optical observation
  29. GRB 211025A: Swift detection of a burst
  30. GECAM detection of a short burst probably from SGR J1555.2-5402
  31. GRB 211024B: Nanshan/NEXT optical afterglow detection
  32. GRB 211023A: OAJ Bright Afterglow Confirmation
  33. GRB 211024B: Swift detection of a burst
  34. GRB 211023A: MASTER OT J045237.07+851925.2 - optical counterpart discovery
  35. GRB 211023B: BOOTES-4/MET and 1.5m OSN optical upper limit
  36. GRB 211023B: Swift/UVOT Detection
  37. GRB 211024A: GECAM detection
  38. GRB 211023B: TSHAO optical observation
  39. IceCube-211023A: No neutrino counterpart detected with ANTARES
  40. GRB 211023A: AGILE detection
  41. GRB 211022A: AstroSat CZTI detection
  42. GRB 211023A: Fermi GBM detection
  43. GRB 211024A: Fermi GBM Final Real-time Localization
  44. GRB 211023A: Fermi-LAT detection
  45. GRB 211023B: Swift detection of a possibly short burst with an optical counterpart
  46. GRB 211023A: Fermi GBM Final Real-time Localization
  47. IceCube-211023A - IceCube observation of a high-energy neutrino candidate track-like event
  48. IPN Triangulation of GRB 210927B
  49. GRB 211022A: GECAM detection
  50. AMON IC_HAWC NuEm-211020A: No neutrino counterpart detected with ANTARES
  51. BepiColombo MGNS joins the IPN
  52. GRB 211019A: Detection by GRBAlpha
  53. GRB 211018A: Detection by GRBAlpha
  54. GRB 211018A: Fermi-LAT detection
  55. GRB 211019A: Fermi GBM Final Real-time Localization
  56. Swift Trigger 1078701: Mondy, CrAO, AbAO observations, possible optical counterpart
  57. Swift Trigger 1078701 is probably not a GRB
  58. IceCube-20210922A: DESNU Optical counterpart candidate from 5 nights of DECam observations
  59. GRB 210928A: MeerKAT detection
  60. GECAM observation of a burst from SGR J1555.2-5402
  61. Konus-Wind detection of GRB 210928A
  62. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  63. GRB 210928A: Fermi-LAT detection
  64. GRB 210927B: GECAM detection
  65. GRB 210930A: CAHA 2.2m telescope optical limit
  66. Swift Trigger 1076121 is not a GRB
  67. Swift GRB211001.03: Global MASTER-Net OT detection
  68. GRB 210930A: Swift detection of a burst
  69. GRB 210929B: Fermi GBM Final Real-time Localization
  70. GRB 210929A: Fermi GBM Final Real-time Localization
  71. GRB 210927A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 654396242)
  72. GRB 210925B: AstroSat CZTI detection
  73. GRB 210926A: AstroSat CZTI detection
  74. IceCube-210926A: No neutrino counterpart candidates in ANTARES search
  75. GRB 210926A: GECAM detection
  76. GRB 210927A: Fermi GBM Final Real-time Localization
  77. GRB 210919A OSN 1.5m Source Confirmation
  78. GRB 210925A: GECAM detection
  79. GRB 210925A: Fermi GBM Final Real-time Localization
  80. GRB 210924A: Fermi GBM Final Real-time Localization
  81. IceCube-210922A: No significant detection in HAWC
  82. IceCube-210922A: No neutrino counterpart candidates in ANTARES search
  83. GRB 210923B: GECAM detection
  84. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  85. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  86. GRB 210923A: Fermi GBM Final Real-time Localization
  87. IceCube-210922A - IceCube observation of a high-energy neutrino candidate track-like event
  88. GRB 210919B: Fermi GBM Final Real-time Localization
  89. GRB 210919A: LCO Optical Upper Limit
  90. GRB 210919A: BOOTES-2/TELMA optical upper limit
  91. GRB 210919A: Swift detection of a short burst
  92. Swift trigger 1073821: detection of IGR J16418-4532
  93. GRB 210917A: Fermi GBM Final Real-time Localization
  94. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  95. GRB 210909A: Detection by GRBAlpha
  96. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  97. GRB 210912A: CAHA 2.2m Detection
  98. GRB 210912A: Swift/UVOT Detection
  99. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)
  100. GRB 210912B: Fermi GBM Final Real-time Localization

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