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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"

27921 results found.

  1. Konus-Wind detection of GRB 220525A
  2. Konus-Wind detection of GRB 220524A
  3. Swift GRB220526.48: Global MASTER-Net observations report
  4. IPN triangulation of GRB 220525A
  5. IPN triangulation of GRB 220524A
  6. GRB 220525A: Fermi GBM Final Real-time Localization
  7. GRB 220521A: ATCA detection
  8. GRB 220521A: ALMA detection
  9. Konus-Wind detection of GRB 220522B
  10. GRB 220521A: BOOTES-2/TELMA and CAHA 2.2m telescope optical upper limit
  11. Konus-Wind detection of GRB 220521B
  12. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  13. IceCube-220524A - IceCube observation of a high-energy neutrino candidate track-like event
  14. GRB 220521A: Gemini Observations
  15. GRB 220523B: Fermi GBM detection
  16. GRB 220521A: MMT Afterglow Imaging
  17. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  18. GRB 220523A: Fermi GBM Final Real-time Localization
  19. GRB 220521A: LCO Optical Detection
  20. GRB 220521A: Swift-BAT refined analysis
  21. GRB 220521A: Fermi GBM detection
  22. GRB 220521A: RATIR Optical and NIR Observations
  23. GRB 220521A: Swift-XRT refined Analysis
  24. GRB 220521A: Swift/UVOT Upper Limits
  25. GRB 220521A: Enhanced Swift-XRT position
  26. GRB 220522A: Fermi GBM Final Real-time Localization
  27. GRB 220521A: NOT optical afterglow detection
  28. GRB 220521A: Prompt enhanced Swift-XRT position
  29. GRB 220521A: Swift detection of a burst
  30. GRB 220521A: Fermi GBM Final Real-time Localization
  31. Swift GRB220521.97: Global MASTER-Net observations report
  32. Konus-Wind detection of GRB 220519A
  33. Swift BAT Trigger 1107209 is not an astrophysical event
  34. GRB 220514A: AstroSat CZTI detection
  35. GRB 220518A: Swift-BAT refined analysis
  36. Swift GRB220519.84: Global MASTER-Net observations report
  37. GRB 220518A: Swift-XRT refined Analysis
  38. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  39. GRB 220518B: Fermi GBM Final Real-time Localization
  40. GRB 220518A: Swift/UVOT Detection
  41. GRB 220518A: Enhanced Swift-XRT position
  42. Swift GRB 220518A: Global MASTER-Net observations report
  43. GRB 220518A: Swift detection of a burst
  44. Konus-Wind detection of GRB 220506A
  45. Konus-Wind detection of GRB 220514B
  46. GRB 220514B: Swift-XRT observations
  47. GRB 220511A: Swift-XRT afterglow detection
  48. GRB 220514B: Tiled Swift observations
  49. IceCube-220513A: No significant detection in HAWC
  50. GRB 220514B: MAXI/GSC detection
  51. GRB 220514A: MeerLICHT optical afterglow candidate
  52. GRB 220514A: Fermi GBM Final Real-time Localization
  53. IceCube-220513A - IceCube observation of a high-energy neutrino candidate track-like event
  54. GRB 220513A: Fermi GBM Final Real-time Localization
  55. Konus-Wind detection of GRB 220511A
  56. GRB 220427A: MeerLICHT afterglow observations
  57. IceCube-220509A: No significant detection in HAWC
  58. GRB 220511A: Fermi GBM observation
  59. GRB 220511A: Swift-XRT observations
  60. GRB 220511A: AstroSat CZTI detection
  61. GRB 220511A: BOOTES-2/TELMA optical upper limit
  62. GRB 220512A: Fermi GBM Final Real-time Localization
  63. GRB 220511A: Swift ToO observations
  64. GRB 220511A: Swift/BAT-GUANO arcminute localization
  65. GRB 220511A: AGILE detection
  66. GRB 220511A: Fermi GBM Final Real-time Localization
  67. GRB 220507A: AstroSat CZTI detection
  68. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  69. IceCube-220509A - IceCube observation of a high-energy neutrino candidate track-like event
  70. GRB 220506A: GIT optical upper limit.
  71. GRB 220508A: Fermi GBM Final Real-time Localization
  72. GRB 220507A: Fermi GBM Final Localization
  73. GRB 220506A: BOOTES-5/JGT optical upper limit
  74. GRB 220506A: Swift-XRT afterglow detection
  75. GRB 220506A: Tiled Swift observations
  76. Swift-BAT triggers 1105560-1 are not GRBs
  77. Swift GRB220506.51: Global MASTER-Net observations report
  78. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  79. GRB 220430A: Nanshan/NEXT optical upper limit
  80. GRB 220430A: Nanshan/HMT optical upper limit
  81. GRB 220430A: GIT optical upper limits
  82. IPN triangulation of GRB 220423A
  83. GRB 220427A: LCO Optical Observations
  84. GRB 220501A: Swift-BAT refined analysis
  85. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  86. GRB 220501A: BOOTES-1 optical upper limit
  87. GRB 220501A: Fermi GBM observation
  88. GRB 220430A: AstroSat CZTI detection
  89. IceCube-220501A - IceCube observation of a high-energy neutrino candidate track-like event
  90. GRB 220501A: Fermi GBM Final Real-time Localization
  91. GRB 220501A: Swift detection of a burst
  92. GRB 220430A: Swift-BAT refined analysis
  93. GRB 220430A: CAHA 2.2m telescope optical limit
  94. GRB 220430A: Swift-XRT refined Analysis
  95. Swift GRB 220430A: Global MASTER-Net observations report
  96. GRB 220430A: GRANDMA observations
  97. GRB 220430A: Mondy and AbAO optical upper limits
  98. GRB 220430A: AGILE detection
  99. GRB 220430A: MeerLICHT optical upper limits
  100. GRB 220430A: Enhanced Swift-XRT position

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