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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"

14975 results found.

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

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