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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"

11848 results found.

  1. Fermi trigger No 660868196: Global MASTER-Net observations report
  2. IceCube-211208A: No significant detection in HAWC
  3. Fermi trigger No 660736561: Global MASTER-Net observations report
  4. IceCube-211208A: Upper limits from a search for additional neutrino events in IceCube
  5. Fermi-LAT Gamma-ray Observations of IceCube-211208A
  6. IceCube-211208A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  7. IceCube-211208A - IceCube observation of a high-energy neutrino candidate track-like event
  8. IceCube Alert 211208.84: Global MASTER-Net observations report
  9. Chandra observation of GW170817 at ~1573 days since merger (Epoch 1 of 4)
  10. GRB 211207A: Swift-XRT refined Analysis
  11. GRB 211207A: Swift detection of a burst with an optical counterpart
  12. GRB 211206A: AstroSat CZTI detection
  13. GRB 211206B: AstroSat CZTI detection
  14. GRB 211204C: AstroSat CZTI detection
  15. GRB 211206A: Swift/BAT-GUANO detection outside the coded FOV
  16. GRB 211206A: AGILE/MCAL detection of a burst
  17. GRB 211204C: Swift/BAT-GUANO detection outside the coded FOV
  18. Konus-Wind detection of GRB 211130A
  19. GRB 211201A: Swift/BAT-GUANO detection likely outside the coded FOV
  20. GRB 211201A: Fermi GBM Final Real-time Localization
  21. GRB 211106A: GECAM detection
  22. GRB 211129A: Swift-XRT refined Analysis
  23. Swift GRB 211129A: Global MASTER-Net observations report
  24. Fermi-LAT Gamma-ray Observations of IceCube-211125A
  25. GRB 211120548: Fermi GBM observation
  26. Konus-Wind detection of GRB 211120A
  27. IPN triangulation of GRB 211120A
  28. Chandra observations of GRB 210905A
  29. Fermi-LAT Gamma-ray Observations of IceCube-211123A
  30. IceCube-211123A: Upper limits from Fermi-GBM Observations
  31. GRB 211124A: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  32. Fermi trigger No 659413798: Global MASTER-Net observations report
  33. GRB 211120A: AGILE detection
  34. GRB 211120A: AstroSat CZTI detection
  35. GRB 211120B: Swift/BAT-GUANO detection outside the coded FOV
  36. GRB 211118A: AstroSat CZTI detection
  37. GRB 211023A: optical observations and photometric evidence of supernova
  38. Fermi-LAT Gamma-ray Observations of IceCube-211117A
  39. GRB211118A: Swift/BAT-GUANO detection outside the coded FOV
  40. Fermi trigger No 658971499: Global MASTER-Net observations report
  41. Fermi-LAT Gamma-ray Observations of IceCube-211116A
  42. Fermi trigger No 658755664: Global MASTER-Net observations report
  43. Konus-Wind detection of GRB 211107B
  44. GRB 211115A: MAXI/GSC detection
  45. GRB 211023A: classification and SPI-ACS/INTEGRAL registration
  46. Fermi GRB 211112A: Global MASTER-Net observations report
  47. GRB 211110A: AstroSat CZTI detection
  48. Fermi trigger No 658214822: Global MASTER-Net observations report
  49. GRB 211107B: Swift-XRT afterglow detection
  50. GRB 211107A: GECAM detection
  51. GRB 211106A: VLT/FORS2 optical observations
  52. Fermi GRB 211109B: Global MASTER-Net observations report
  53. Fermi GRB 211109A: Global MASTER-Net observations report
  54. Konus-Wind detection of GRB 211106A
  55. GRB 211023A: BTA spectroscopic redshift
  56. GRB 211107A: Fermi GBM Final Real-time Localization
  57. GRB 211106A: Swift/BAT-GUANO candidate arcminute localization of a short burst
  58. GRB 211105A: MASTER optical inspection
  59. GRB 211105A: Swift/BAT-GUANO detection outside the coded FOV
  60. GRB 211105A: AGILE detection of a burst
  61. Fermi trigger No 657742914: Global MASTER-Net observations report
  62. GRB 211102B: GECAM detection
  63. Konus-Wind detection of GRB 211023A
  64. Fermi GRB 211027A: Global MASTER-Net observations report
  65. GRB 211025A: Swift-XRT refined Analysis
  66. GRB 211024B: Swift-XRT refined Analysis
  67. GRB 210610B: Sintesz-Newton/CrAO optical observations
  68. GRB 211025A: Swift detection of a burst
  69. GRB 211024B: Swift detection of a burst
  70. Fermi-LAT Gamma-ray Observations of IceCube-211023A
  71. GRB 211023B: BOOTES-4/MET and 1.5m OSN optical upper limit
  72. GRB 211023A: AGILE detection
  73. GRB 211022A: AstroSat CZTI detection
  74. GRB 211023B: Swift-XRT refined Analysis
  75. Fermi GRB 211024A: Global MASTER-Net observations report
  76. GRB 211023A: Fermi-LAT detection
  77. GRB 211023B: Swift detection of a possibly short burst with an optical counterpart
  78. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-211020A
  79. BepiColombo MGNS joins the IPN
  80. Fermi trigger No 656268212: Global MASTER-Net observations report
  81. GRB 211018A: Fermi-LAT detection
  82. Fermi trigger No 656288898: Global MASTER-Net observations report
  83. Integral GRB211016.42: Global MASTER-Net observations report
  84. IceCube-210922A: Hard X-ray flux limit for JCMT/SCUBA2 source from NuSTAR observations
  85. Fermi trigger No 655646385: Global MASTER-Net observations report
  86. Fermi trigger No 655401471: Global MASTER-Net observations report
  87. IceCube-210922A: DESI Observations
  88. Konus-Wind detection of GRB 210928A
  89. Fermi trigger No 654854799: Global MASTER-Net observations report
  90. GRB 210930A: Swift-BAT refined analysis
  91. GRB 210928A: Fermi-LAT detection
  92. Fermi trigger No 654739449: Global MASTER-Net observations report
  93. Swift GRB211001.03: Global MASTER-Net observations report
  94. Swift GRB211001.03: Global MASTER-Net OT detection
  95. Fermi GRB 210929B: Global MASTER-Net observations report
  96. Fermi-LAT Gamma-ray Observations of IceCubeCascade-210926A
  97. GRB 210925B: AstroSat CZTI detection
  98. IPN triangulation of GRB 210925B
  99. GRB 210926A: AstroSat CZTI detection
  100. GRB 210919A: iTelescope T-11 upper limits

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