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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

12096 results found.

  1. Konus-Wind detection of GRB 220222A
  2. IceCube-220225A: Upper limits from a search for additional neutrino events in IceCube
  3. Fermi trigger No 667737010: Global MASTER-Net observations report
  4. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  5. IceCube Alert 220225.59: Global MASTER-Net observations report
  6. ZTF22aaajecp/AT2022cmc: DECam Photometry
  7. Konus-Wind observation of GRB 220219B
  8. Fermi GRB 220223A: Global MASTER-Net observations report
  9. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  10. IceCube-220221A: Upper limits from a search for additional neutrino events in IceCube
  11. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  12. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  13. ZTF22aabjpxh/AT2022cva: Assy optical observations
  14. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  15. Konus-Wind observation of GRB 220219A
  16. IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart
  17. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  18. IceCube Alert 220220.60: Global MASTER-Net observations report
  19. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220220A
  20. Fermi trigger No 666962499: Global MASTER-Net observations report
  21. Swift GRB220218.94: Global MASTER-Net observations report
  22. GRB 220211A: redshift lower limit estimating
  23. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  24. Konus-Wind detection of GRB 220209A
  25. Konus-Wind detection of GRB 220211A
  26. Fermi trigger No 666489765: Global MASTER-Net observations report
  27. Fermi GBM trigger 666393834/220212892 is not a GRB
  28. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220212A
  29. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  30. GRB 220209A: Fermi-LAT detection
  31. GRB 220210A: Fermi-LAT detection
  32. Fermi GRB 220211A: Global MASTER-Net observations report
  33. GRB 210919A: Maidanak optical observations
  34. GRB 220209A: AGILE/MCAL detection
  35. IceCube-220205B: Upper limits from a search for additional neutrino events in IceCube
  36. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  37. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  38. Konus-Wind detection of GRB 220130A
  39. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  40. Konus-Wind detection of GRB 220203A
  41. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  42. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  43. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  44. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  45. Konus-Wind detection of GRB 220128A
  46. GRB 220131B: GECAM detection
  47. GRB 220129A: Fermi GBM Final Real-time Localization
  48. GECAM observations of a series of bursts from SGR J1935+2154
  49. Konus-Wind detection of GRB 220124A
  50. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  51. GRB 220117A: Terskol and AbAO optical upper limits
  52. GRB 220118A: TARGET optical upper limit
  53. GRB 220117B: TARGET optical upper limit
  54. Fermi-LAT-ANTARES 220121a: upper limits from a search for coincident neutrinos with IceCube
  55. AGILE observations of a bright burst from SGR 1935+2154
  56. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  57. IPN triangulation of a bright burst from SGR 1935+2154
  58. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  59. IPN triangulation of GRB 211226A
  60. GRB 220120A: Fermi GBM Final Localization
  61. GRB 220118A: Fermi GBM detection
  62. GRB 220117C: Swift/BAT-GUANO arcminute localization
  63. Konus-Wind observation of the recent SGR 1935+2154 activity
  64. GRB 220118A: Swift detection of a burst with an optical counterpart
  65. GRB 220118A: Fermi GBM Final Real-time Localization
  66. Fermi-LAT Gamma-ray Observations of IceCube-220115A and detection of a new gamma-ray source, Fermi J2350.2+2620
  67. GRB 220117B: Swift-XRT refined Analysis
  68. GRB 220117A: Swift-XRT refined Analysis
  69. GRB 220117B: Nanshan/NEXT optical upper limit
  70. GRB 220117B: MITSuME Akeno optical upper limits
  71. GRB 220101A: TSHAO optical observation, Terskol, AbAO upper limits
  72. Swift GRB 220117A: Global MASTER-Net observations report
  73. Swift GRB 220117B: Global MASTER-Net observations report
  74. GRB 220117B: Swift detection of a burst
  75. GRB 220117A: Swift detection of a burst
  76. GECAM observations of a series of bursts from SGR J1935+2154
  77. Fermi trigger No 663967527: Global MASTER-Net observations report
  78. Fermi trigger No 663899819: Global MASTER-Net observations report
  79. Fermi trigger No 663966693: Global MASTER-Net observations report
  80. Fermi trigger No 663921434: Global MASTER-Net observations report
  81. GECAM observations of a series of bursts from SGR J1935+2154
  82. Fermi trigger No 663710289: Global MASTER-Net observations report
  83. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  84. AGILE observations of a burst from SGR 1935+2154
  85. GECAM observations of a series of bursts from SGR J1935+2154
  86. GRB 220111A: AstroSat CZTI detection
  87. Fermi GRB 220111A: Global MASTER-Net observations report
  88. Konus-Wind detection of GRB 220101A
  89. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  90. Konus-Wind detection of GRB 220107B
  91. Konus-Wind detection of GRB 220107A
  92. GECAM observations of a series of bursts from SGR J1935+2154
  93. GRB 220107A: further SAO RAS optical observations
  94. GRB 220108A: Swift/BAT-GUANO detection outside the coded FOV
  95. GRB 220107B: Nanshan/NEXT optical upper limits and host galaxy candidate
  96. GRB 220107A: MITSuME Akeno optical observation
  97. GRB 220107B: AstroSat CZTI detection
  98. GRB 220107A: Swift-XRT afterglow detection
  99. GRB 220107B: Fermi-LAT detection
  100. GRB 220107A: AstroSat CZTI detection

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