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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"

12124 results found.

  1. GRB 220319A: Swift detection of a burst
  2. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  3. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  4. IceCube-220317A: MASTER Global Robotic Net optical observations
  5. GRB 220310C: Swift-XRT observations
  6. Konus-Wind detection of GRB 220310A
  7. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  8. GRB 220311A: A long GRB detected by INTEGRAL
  9. Integral GRB220311.69: Global MASTER-Net observations report
  10. GRB 220308A: AGILE detection
  11. ZTF22aaajecp/AT2022cmc: Hubble Space Telescope Observations
  12. GRB 220310A: MAXI/GSC detection
  13. Konus-Wind detection of GRB 220308A
  14. Fermi GRB 220309A: Global MASTER-Net observations report
  15. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  16. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  17. IPN triangulation of GRB 220305B
  18. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  19. GRB 220306B: BOOTES-1 optical upper limit
  20. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  21. GRB 220306A: Fermi GBM Final Real-time Localization
  22. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  23. IceCube Alert 220304.74: Global MASTER-Net observations report
  24. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  25. Fermi GRB 220304A: Global MASTER-Net observations report
  26. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  27. GRB 220302A: Swift detection of a burst
  28. GRB 220228A: Fermi-LAT detection
  29. Konus-Wind detection of GRB 220222A
  30. IceCube-220225A: Upper limits from a search for additional neutrino events in IceCube
  31. Fermi trigger No 667737010: Global MASTER-Net observations report
  32. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  33. IceCube Alert 220225.59: Global MASTER-Net observations report
  34. ZTF22aaajecp/AT2022cmc: DECam Photometry
  35. Konus-Wind observation of GRB 220219B
  36. Fermi GRB 220223A: Global MASTER-Net observations report
  37. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  38. IceCube-220221A: Upper limits from a search for additional neutrino events in IceCube
  39. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  40. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  41. ZTF22aabjpxh/AT2022cva: Assy optical observations
  42. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  43. Konus-Wind observation of GRB 220219A
  44. IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart
  45. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  46. IceCube Alert 220220.60: Global MASTER-Net observations report
  47. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220220A
  48. Fermi trigger No 666962499: Global MASTER-Net observations report
  49. Swift GRB220218.94: Global MASTER-Net observations report
  50. GRB 220211A: redshift lower limit estimating
  51. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  52. Konus-Wind detection of GRB 220209A
  53. Konus-Wind detection of GRB 220211A
  54. Fermi trigger No 666489765: Global MASTER-Net observations report
  55. Fermi GBM trigger 666393834/220212892 is not a GRB
  56. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220212A
  57. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  58. GRB 220209A: Fermi-LAT detection
  59. GRB 220210A: Fermi-LAT detection
  60. Fermi GRB 220211A: Global MASTER-Net observations report
  61. GRB 210919A: Maidanak optical observations
  62. GRB 220209A: AGILE/MCAL detection
  63. IceCube-220205B: Upper limits from a search for additional neutrino events in IceCube
  64. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  65. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  66. Konus-Wind detection of GRB 220130A
  67. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  68. Konus-Wind detection of GRB 220203A
  69. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  70. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  71. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  72. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  73. Konus-Wind detection of GRB 220128A
  74. GRB 220131B: GECAM detection
  75. GRB 220129A: Fermi GBM Final Real-time Localization
  76. GECAM observations of a series of bursts from SGR J1935+2154
  77. Konus-Wind detection of GRB 220124A
  78. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  79. GRB 220117A: Terskol and AbAO optical upper limits
  80. GRB 220118A: TARGET optical upper limit
  81. GRB 220117B: TARGET optical upper limit
  82. Fermi-LAT-ANTARES 220121a: upper limits from a search for coincident neutrinos with IceCube
  83. AGILE observations of a bright burst from SGR 1935+2154
  84. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  85. IPN triangulation of a bright burst from SGR 1935+2154
  86. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  87. IPN triangulation of GRB 211226A
  88. GRB 220120A: Fermi GBM Final Localization
  89. GRB 220118A: Fermi GBM detection
  90. GRB 220117C: Swift/BAT-GUANO arcminute localization
  91. Konus-Wind observation of the recent SGR 1935+2154 activity
  92. GRB 220118A: Swift detection of a burst with an optical counterpart
  93. GRB 220118A: Fermi GBM Final Real-time Localization
  94. Fermi-LAT Gamma-ray Observations of IceCube-220115A and detection of a new gamma-ray source, Fermi J2350.2+2620
  95. GRB 220117B: Swift-XRT refined Analysis
  96. GRB 220117A: Swift-XRT refined Analysis
  97. GRB 220117B: Nanshan/NEXT optical upper limit
  98. GRB 220117B: MITSuME Akeno optical upper limits
  99. GRB 220101A: TSHAO optical observation, Terskol, AbAO upper limits
  100. Swift GRB 220117A: Global MASTER-Net observations report

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