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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"

12113 results found.

  1. GRB 220511A: AGILE detection
  2. GRB 220507A: AstroSat CZTI detection
  3. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  4. Fermi trigger No 673846271: Global MASTER-Net observations report
  5. Swift GRB220506.51: Global MASTER-Net observations report
  6. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  7. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  8. GRB 220501A: BOOTES-1 optical upper limit
  9. GRB 220430A: AstroSat CZTI detection
  10. GRB 220430A: Swift-BAT refined analysis
  11. GRB 220430A: CAHA 2.2m telescope optical limit
  12. GRB 220430A: Mondy and AbAO optical upper limits
  13. GRB 220430A: AGILE detection
  14. GRB 220430A: MeerLICHT optical upper limits
  15. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  16. Konus-Wind detection of GRB 220427A
  17. Konus-Wind detection of GRB 220426A
  18. GRB 220426C: Swift/BAT-GUANO detection outside the coded FOV (short)
  19. Fermi GRB 220426A: Global MASTER-Net observations report
  20. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  21. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  22. Fermi GRB 220426B: Global MASTER-Net observations report
  23. Fermi-LAT Gamma-ray Observations of IceCube-220424A
  24. IceCube Alert 220425.11: Global MASTER-Net observations report
  25. Fermi trigger No 672492774: Global MASTER-Net observations report
  26. GRB 220423A: Swift/BAT-GUANO detection outside the coded FOV
  27. IceCube Alert 220424.05: Global MASTER-Net observations report
  28. GRB 220423A: AGILE detection
  29. Fermi-LAT Gamma-ray Observations of IceCube-220421A
  30. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  31. Fermi GBM trigger 672128054/220420260 is not a GRB
  32. IceCube-220421A - IceCube observation of a high-energy neutrino candidate track-like event
  33. Fermi trigger No 672093919: Global MASTER-Net observations report
  34. GRB 220420A: Swift/BAT-GUANO detection outside the coded FOV
  35. IPN triangulation of GRB 220411A
  36. GRB 220418B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  37. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  38. Fermi GRB 220417A: Global MASTER-Net observations report
  39. Konus-Wind detection of GRB 220412B
  40. GRB 220412B: Fermi GBM observation
  41. Konus-Wind detection of GRB 220403C
  42. Konus-Wind detection of GRB 220408B
  43. GRB 220412A: Swift-BAT refined analysis
  44. GRB 220408B: Fermi-LAT detection
  45. GRB 220412A: Swift-XRT refined Analysis
  46. GRB 220412A: Enhanced Swift-XRT position
  47. GRB 220412A: Swift/UVOT Upper Limits
  48. GRB 220408A: GRANDMA observations
  49. GRB 220412A: Swift detection of a burst
  50. Swift GRB220412.28: Global MASTER-Net observations report
  51. GRB 220411A: AstroSat CZTI detection
  52. IPN triangulation of GRB 220408B
  53. IPN triangulation of GRB 220403C
  54. Fermi GRB 220411A: Global MASTER-Net observations report
  55. GRB 220411A: BALROG localization (Fermi Trigger 671354405/ GRB 220411306)
  56. GRB 220411A: Fermi GBM Final Real-time Localization
  57. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  58. GRB 220408B: AstroSat CZTI detection
  59. GRB 220408A: Swift-XRT refined Analysis
  60. Fermi GRB 220408B: Global MASTER-Net observations report
  61. GRB 220408A: Fermi GBM observation
  62. Chandra upper limit at the location of GRB 220408A
  63. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  64. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, SAO RAS, CrAO)
  65. Fermi-LAT Gamma-ray Observations of IceCube-220405B
  66. GRB 220403B: Mondy optical upper limit
  67. IceCube-220405B: No Candidate Counterparts from the Zwicky Transient Facility
  68. GRB 220403B: 1.5m OSN optical observation
  69. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  70. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  71. IceCube Alert 220405.21: Global MASTER-Net observations report
  72. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  73. GRB 220403B: Fermi GBM detection
  74. GRB 220404A: Swift detection of a burst
  75. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  76. GRB 220403B: Swift detection of a burst with an optical counterpart
  77. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  78. Swift GRB220402.16: Global MASTER-Net observations report
  79. Fermi GRB 220401B: Global MASTER-Net observations report
  80. Fermi GRB 220330A: Global MASTER-Net observations report
  81. Konus-Wind observation of GRB 220320A
  82. GRB 220325A: 1.3m DFOT Optical upper limit
  83. GRB 220324A: AstroSat CZTI detection
  84. GRB 220323A: AstroSat CZTI detection
  85. GRB 220316A: AstroSat CZTI detection
  86. GRB 220320A: AstroSat CZTI detection
  87. GRB 220319A: LCO Optical Upper Limit
  88. GRB 220319A: Swift-XRT refined Analysis
  89. GRB 220319A: MASTER Global Robotic Net optical observations
  90. GRB 220319A: Swift detection of a burst
  91. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  92. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  93. IceCube-220317A: MASTER Global Robotic Net optical observations
  94. GRB 220310C: Swift-XRT observations
  95. Konus-Wind detection of GRB 220310A
  96. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  97. GRB 220311A: A long GRB detected by INTEGRAL
  98. Integral GRB220311.69: Global MASTER-Net observations report
  99. GRB 220308A: AGILE detection
  100. ZTF22aaajecp/AT2022cmc: Hubble Space Telescope Observations

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