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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"

14972 results found.

  1. GRB 220118A: Swift/UVOT Detection
  2. GRB 220118A: Swift detection of a burst with an optical counterpart
  3. GRB 220118A: Fermi GBM Final Real-time Localization
  4. Fermi GBM Sub-Threshold Detection of GRB 220117A
  5. Fermi-LAT Gamma-ray Observations of IceCube-220115A and detection of a new gamma-ray source, Fermi J2350.2+2620
  6. AMON IC_HAWC NuEm-220116A: No neutrino counterpart detected with ANTARES
  7. GRB 220117B: Swift detection of a burst
  8. GRB 220117A: Swift detection of a burst
  9. GECAM observations of a series of bursts from SGR J1935+2154
  10. GRB 220115B: Fermi GBM Final Real-time Localization
  11. GRB 210919A: LBT spectroscopic redshift of the host galaxy candidates
  12. GRB 220115A: Fermi GBM Final Real-time Localization
  13. IceCube-220115A - IceCube observation of a high-energy neutrino candidate track-like event
  14. GRB 220114A: Fermi GBM Final Localization
  15. GECAM observations of a series of bursts from SGR J1935+2154
  16. GECAM observations of a series of bursts from SGR J1935+2154
  17. GRB 220111A: AstroSat CZTI detection
  18. Konus-Wind detection of GRB 220101A (correction to GCN 31433)
  19. GRB 220111A: Fermi GBM Final Real-time Localization
  20. Konus-Wind detection of GRB 220101A
  21. Konus-Wind detection of GRB 220107B
  22. Konus-Wind detection of GRB 220107A
  23. GECAM observations of a series of bursts from SGR J1935+2154
  24. GRB 220107A: 6m BTA spectroscopic redshift
  25. GRB 220108A: Swift/BAT-GUANO detection outside the coded FOV
  26. GRB 220107A: Swift/UVOT Detection
  27. GRB 220107B: AstroSat CZTI detection
  28. GRB 220107B: Swift-XRT afterglow detection
  29. GRB 220107A: Swift-XRT afterglow detection
  30. GRB 220107B: Fermi-LAT detection
  31. GRB 220107A: AstroSat CZTI detection
  32. GRB 220107A: Fermi GBM Final Real-time Localization
  33. GECAM observation of a burst from SGR J1555.2-5402
  34. GECAM detection of a short burst from SGR 1935+2154
  35. GECAM observations of a series of bursts from SGR J1935+2154
  36. GRB 220101A: 3rd LCO Optical Observation
  37. GRB 220101A: 2.2m CAHA (+CAFOS) first day optical detection
  38. GRB 220101A: VLA detection
  39. GRB 220101A: LCO Continued Optical Observations
  40. GRB 220104A：GECAM detection
  41. GRB 220104A: Fermi GBM Final Real-time Localization
  42. GRB 220103A: Fermi GBM Final Real-time Localization
  43. GRB 211229B: Swift/BAT-GUANO detection outside the coded FOV
  44. GRB 220101A: TNG NIR afterglow detection
  45. GRB 220101A: ALMA detection
  46. GRB 220101A: LCO Optical Observations
  47. GRB 211231A: AstroSat CZTI detection
  48. GRB 220101A: OASDG optical observations
  49. GRB 220101A: Asiago spectroscopic and photometric detection
  50. GRB220101A: optical afterglow detection from Konkoly Observatory
  51. GRB 220101A: Fermi GBM Detection
  52. GRB 220101A: CAHA 2.2m/CAFOS detection
  53. GRB 220101A: AGILE detection
  54. GRB 220101: Swift/UVOT Detection
  55. GRB 220101A: Fermi-LAT detection
  56. GRB 220101A: Swift detection of a burst with a bright optical counterpart
  57. IPN triangulation of GRB 211219A
  58. GRB 211231A: GECAM detection
  59. GRB 211229B: AGILE detection
  60. GRB 211231A: Fermi GBM Final Real-time Localization
  61. GRB 211227A: Deep early CAHA 2.2m/CAFOS observation
  62. GRB 211229B: GECAM detection
  63. GRB 211229C: Swift/BAT-GUANO detection likely outside the coded FOV
  64. GRB 211229B: Fermi GBM Final Real-time Localization
  65. GRB 211227A: CALET Gamma-Ray Burst Monitor detection
  66. GRB 211225B: CALET Gamma-Ray Burst Monitor detection
  67. GRB 211229A: GECAM detection
  68. GRB 211229A: Fermi GBM Final Real-time Localization
  69. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  70. GRB 211227A: LCO Optical Observations
  71. GRB 211227A: MAXI/GSC detection
  72. GRB 211227A: BOOTES-2/TELMA optical upper limit
  73. GRB 211227A: Swift detection of a burst
  74. GRB 211226A: Swift/BAT-GUANO detection outside the coded FOV
  75. GRB 211226A: AGILE/MCAL detection of a burst
  76. GRB 211225C: Fermi GBM Final Real-time Localization
  77. GRB 211225B: Swift detection of a burst
  78. GRB 211225A/MAXI J0827-071: MAXI/GSC detection
  79. GRB 211224A: Fermi GBM Final Real-time Localization
  80. GRB 211223C: BOOTES-4/MET optical upper limit
  81. GRB 211223A: Insight-HXMT/HE detection
  82. Fermi GBM Sub-Threshold Detection of GRB 211221A
  83. Fermi GBM Sub-Threshold Detection of GRB 211207A
  84. GRB 211223C: Swift detection of a burst
  85. GRB 211223B: Fermi GBM Final Real-time Localization
  86. GRB 211223A: GECAM detection
  87. GRB 211219B: AstroSat CZTI detection
  88. GRB 211219A: AstroSat CZTI detection
  89. GRB 211222A: Fermi GBM Final Real-time Localization
  90. GRB 211221A: BOOTES-4/MET optical upper limit
  91. GRB 211221A: MeerLICHT optical limits
  92. GRB 211221A: Swift detection of a burst
  93. IceCube-211216B: No significant detection in HAWC
  94. IceCube-211216A: No significant detection in HAWC
  95. GRB 211219A: AGILE detection
  96. GRB 211219A: Swift/BAT-GUANO detection outside the coded FOV
  97. GRB 211219B: Fermi GBM Final Real-time Localization
  98. GRB 211219A: Fermi GBM Final Real-time Localization
  99. IceCube-211216B: No neutrino counterpart candidates in ANTARES search
  100. GRB 211218A, MAXI J0909-041: MAXI/GSC detection

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