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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"

11836 results found.

  1. Fermi GRB 220523B: Global MASTER-Net observations report
  2. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  3. Fermi GRB 220523A: Global MASTER-Net observations report
  4. GRB 220521A: Fermi GBM detection
  5. GRB 220521A: Sintesz-Newton/CrAO optical upper limit
  6. GRB 220521A: NOT optical afterglow detection
  7. GRB 220521A: Prompt enhanced Swift-XRT position
  8. GRB 220521A: Swift detection of a burst
  9. GRB 220521A: Fermi GBM Final Real-time Localization
  10. Swift GRB220521.97: Global MASTER-Net observations report
  11. Konus-Wind detection of GRB 220519A
  12. Swift BAT Trigger 1107209 is not an astrophysical event
  13. GRB 220514A: AstroSat CZTI detection
  14. Swift GRB220519.84: Global MASTER-Net observations report
  15. GRB 220518A: Swift-XRT refined Analysis
  16. GRB 220518A: Swift detection of a burst
  17. Konus-Wind detection of GRB 220506A
  18. Konus-Wind detection of GRB 220514B
  19. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  20. GRB 220514B: MAXI/GSC detection
  21. GRB 220514A: a long GRB detected by INTEGRAL
  22. IceCube Alert 220513.97: Global MASTER-Net observations report
  23. GRB 220513A: Fermi GBM Final Real-time Localization
  24. Konus-Wind detection of GRB 220511A
  25. GRB 220511A: AstroSat CZTI detection
  26. GRB 220511A: AGILE detection
  27. GRB 220507A: AstroSat CZTI detection
  28. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  29. Fermi trigger No 673846271: Global MASTER-Net observations report
  30. Swift GRB220506.51: Global MASTER-Net observations report
  31. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  32. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  33. GRB 220501A: BOOTES-1 optical upper limit
  34. GRB 220430A: AstroSat CZTI detection
  35. GRB 220430A: Swift-BAT refined analysis
  36. GRB 220430A: CAHA 2.2m telescope optical limit
  37. GRB 220430A: Mondy and AbAO optical upper limits
  38. GRB 220430A: AGILE detection
  39. GRB 220430A: MeerLICHT optical upper limits
  40. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  41. Konus-Wind detection of GRB 220427A
  42. Konus-Wind detection of GRB 220426A
  43. GRB 220426C: Swift/BAT-GUANO detection outside the coded FOV (short)
  44. Fermi GRB 220426A: Global MASTER-Net observations report
  45. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  46. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  47. Fermi GRB 220426B: Global MASTER-Net observations report
  48. Fermi-LAT Gamma-ray Observations of IceCube-220424A
  49. IceCube Alert 220425.11: Global MASTER-Net observations report
  50. Fermi trigger No 672492774: Global MASTER-Net observations report
  51. GRB 220423A: Swift/BAT-GUANO detection outside the coded FOV
  52. IceCube Alert 220424.05: Global MASTER-Net observations report
  53. GRB 220423A: AGILE detection
  54. Fermi-LAT Gamma-ray Observations of IceCube-220421A
  55. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  56. Fermi GBM trigger 672128054/220420260 is not a GRB
  57. IceCube-220421A - IceCube observation of a high-energy neutrino candidate track-like event
  58. Fermi trigger No 672093919: Global MASTER-Net observations report
  59. GRB 220420A: Swift/BAT-GUANO detection outside the coded FOV
  60. IPN triangulation of GRB 220411A
  61. GRB 220418B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  62. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  63. Fermi GRB 220417A: Global MASTER-Net observations report
  64. Konus-Wind detection of GRB 220412B
  65. GRB 220412B: Fermi GBM observation
  66. Konus-Wind detection of GRB 220403C
  67. Konus-Wind detection of GRB 220408B
  68. GRB 220412A: Swift-BAT refined analysis
  69. GRB 220408B: Fermi-LAT detection
  70. GRB 220412A: Swift-XRT refined Analysis
  71. GRB 220412A: Enhanced Swift-XRT position
  72. GRB 220412A: Swift/UVOT Upper Limits
  73. GRB 220408A: GRANDMA observations
  74. GRB 220412A: Swift detection of a burst
  75. Swift GRB220412.28: Global MASTER-Net observations report
  76. GRB 220411A: AstroSat CZTI detection
  77. IPN triangulation of GRB 220408B
  78. IPN triangulation of GRB 220403C
  79. Fermi GRB 220411A: Global MASTER-Net observations report
  80. GRB 220411A: BALROG localization (Fermi Trigger 671354405/ GRB 220411306)
  81. GRB 220411A: Fermi GBM Final Real-time Localization
  82. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  83. GRB 220408B: AstroSat CZTI detection
  84. GRB 220408A: Swift-XRT refined Analysis
  85. Fermi GRB 220408B: Global MASTER-Net observations report
  86. GRB 220408A: Fermi GBM observation
  87. Chandra upper limit at the location of GRB 220408A
  88. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  89. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, SAO RAS, CrAO)
  90. Fermi-LAT Gamma-ray Observations of IceCube-220405B
  91. GRB 220403B: Mondy optical upper limit
  92. IceCube-220405B: No Candidate Counterparts from the Zwicky Transient Facility
  93. GRB 220403B: 1.5m OSN optical observation
  94. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  95. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  96. IceCube Alert 220405.21: Global MASTER-Net observations report
  97. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  98. GRB 220403B: Fermi GBM detection
  99. GRB 220404A: Swift detection of a burst
  100. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV

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