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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"

14981 results found.

  1. GRB 210619B: 1.5m OSN optical observation
  2. GRB 210619B: REM optical/NIR afterglow detection
  3. GRB 210621A: Fermi GBM Final Real-time Localization
  4. GRB 210619B: CALET Gamma-Ray Burst Monitor detection
  5. GRB 210619B: SRG/ART-XC detection
  6. GRB 210619B: Fermi GBM detection
  7. GRB 210619B: Swift/UVOT Detection
  8. GRB 210619B: Xinglong TNT optical observations
  9. Konus-Wind detection of GRB 210619B
  10. GRB 210619B: CAHA 2.2m photometric monitoring
  11. GRB 210619B: Liverpool Telescope r'-band observations
  12. GRB 210619B: KAIT Optical Detection
  13. GRB 210619B: Fermi-LAT detection
  14. GRB 210619B: SARA-KP 0.9m Optical Afterglow Detection
  15. GRB 210619B: iTelescope T18 detection
  16. GECAM detection of GRB 210619B
  17. GRB 210619B: Ondrejov D50 detection
  18. Swift GRB210619.99: Global MASTER-Net OT detection
  19. GRB 210619B: Swift detection of a bright burst and optical counterpart
  20. Swift GRB210619.99: Global MASTER-Net OT detection
  21. GRB 210619A: Fermi GBM Final Real-time Localization
  22. GRB 210618A: BOOTES-2/TELMA optical upper limit
  23. GRB 210618A: Swift detection of a burst
  24. GRB 210618A: Fermi GBM Final Real-time Localization
  25. GRB 210610B: Swift/UVOT Detection
  26. GRB 210610A: Swift/UVOT Detection
  27. GRB 210615A: Fermi GBM Final Real-time Localization
  28. GRB 210605B: Swift-XRT afterglow detection
  29. GRB 210610B: Continued KAIT Optical Detection
  30. GRB 210421B: Fermi GBM detection
  31. GRB 210607C: AstroSat CZTI detection
  32. Swift-BAT Trigger 1055000: Swift detection of an outburst from 4U 1543-47
  33. GRB210610B: SARA-KP 0.9m Optical Afterglow Detection
  34. GRB 210610B: VLA detection
  35. GRB 210610B: ALMA detection
  36. GRB 210606A: Fermi GBM detection
  37. GRB 210605B: Fermi GBM detection
  38. GRB 210610B: Zwicky Transient Facility afterglow detection
  39. GRB 210610B: KAIT Optical Detection
  40. GRB 210610A: KAIT Optical Detection
  41. GRB 210607C: Insight-HXMT/HE detection
  42. GRB 210610B: Fermi GBM detection
  43. Konus-Wind detection of GRB 210610A
  44. Konus-Wind detection of GRB 210610B
  45. GRB 210610B: AGILE detection
  46. GRB 210610B: GOTO confirmation of afterglow detection
  47. GRB 210610A: RATIR Optical and NIR Detection
  48. GRB 210610B: SAO RAS optical observations
  49. GRB 210610A: 1.5m OSN optical observation
  50. GRB210610B: MeerLICHT multi-colour photometry
  51. GRB 210610B: GIT optical detection
  52. Swift GRB210610.83: Global MASTER-Net OT detection
  53. GRB 210606A: Swift-XRT afterglow detection
  54. GRB 210610B: Swift detection of a burst with bright optical afterglow
  55. GRB210610A: MeerLICHT multi-colour photometry
  56. GRB 210610A: Xinglong-2.16m redshift
  57. GRB 210610A: GIT optical detection
  58. GRB 210610A: Xinglong-2.16m optical afterglow observations
  59. GRB 210610A: Swift detection of a burst with an optical counterpart
  60. GRB 210607B: Insight-HXMT/HE detection
  61. GRB 210605A: CALET Gamma-Ray Burst Monitor detection
  62. Konus-Wind detection of GRB 210606B
  63. IPN triangulation of GRB 210606B
  64. IceCube-210608A: IceCube observation of a high-energy neutrino candidate track-like event
  65. GRB 210607A/MAXI J1733-222: MAXI/GSC detection
  66. GRB 210606B: Fermi GBM detection
  67. Konus-Wind detection of GRB 210602A
  68. Konus-Wind detection of GRB 210605A (short/hard)
  69. IPN triangulation of GRB 210605A (short)
  70. GRB 210606B: AGILE detection
  71. GRB 210606A: 1.5m OSN optical upper limit
  72. GECAM Sub-Threshold Detection of new magnetar Swift SGR J1555.2-5402
  73. GRB 210606B: GECAM detection
  74. GRB 210606A: Swift/BAT-GUANO detection and arcminute localization
  75. GRB 210606A: Fermi GBM Final Real-time Localization
  76. GRB 210605B: Swift/BAT-GUANO detection and arcminute localization
  77. GRB 210605B: Fermi GBM Final Real-time Localization
  78. GRB 210605A: Fermi GBM Final Real-time Localization
  79. Fermi GBM Sub-Threshold Detection of new Swift SGR J1555.2-5402
  80. Swift Detection of probable new Swift SGR J1555.2-5402
  81. GRB 210602A: CALET Gamma-Ray Burst Monitor detection
  82. GRB 210602B: GECAM detection
  83. GRB 210529A: GECAM detection
  84. GRB 210602A: MAXI/GSC detection
  85. GRB 210601A: Fermi GBM Final Real-time Localization
  86. IPN triangulation of GRB 210531A
  87. GRB210529B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 644025222)
  88. GRB 210531A: AstroSat CZTI detection
  89. GRB 210531A: AGILE/MCAL detection (Fermi Trigger 644155206 / GRB 210531500)
  90. GRB 210529B: Fermi GBM Final Real-time Localization
  91. GRB 210529A: Fermi GBM Final Real-time Localization
  92. GRB 210528A: Fermi GBM detection
  93. GRB 210528A: AstroSat CZTI detection
  94. GRB 210528B: MAXI/GSC detection
  95. GRB 210528A: Fermi GBM Final Real-time Localization
  96. GRB 210527A: Swift detection of a burst
  97. Konus-Wind detection of GRB 210524A
  98. IPN triangulation of GRB 210524A
  99. GRB 210524B: Fermi GBM Final Real-time Localization
  100. GRB 210524A: Fermi GBM Final Real-time Localization

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