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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"

19663 results found.

  1. GRB 210901A: Enhanced Swift-XRT position
  2. GRB 210901A: LCO Optical Upper Limit
  3. Swift GRB 210901A: Global MASTER-Net observations report
  4. GRB 210901A: Swift detection of a burst
  5. GRB 210827A: further Swift-XRT observations
  6. GRB 210822A: CALET Gamma-Ray Burst Monitor detection
  7. GRB 210827A: Swift/UVOT Upper Limits
  8. GRB 210827A: BOOTES-5/JGT optical upper limit
  9. GRB 210827A: Fermi GBM Observation
  10. GRB 210827A: Swift-XRT observations
  11. GRB 210827A: Swift ToO observations
  12. GRB 210827A: Swift/BAT-GUANO detection and arcminute localization
  13. GRB 210820A: CAHA 2.2m Optical Detection
  14. GRB 210824A: Swift/UVOT Upper Limits
  15. GRB 210826A: Swift/UVOT Upper Limits
  16. GRB 210826A: Swift-XRT observations
  17. GRB 210822A: CAHA 2.2m observations
  18. GRB 210824A: Swift-BAT refined analysis
  19. GRB 210826A: Fermi-LAT detection
  20. GRB 210826A: Tiled Swift observations
  21. Swift GRB210825.29: Global MASTER-Net observations report
  22. GRB 210822A: VLA detection
  23. Swift detection of an outburst from SGR Swift J1555.2-5402
  24. GRB 210822A: Swift/UVOT Detection
  25. Swift GRB 210824A: Global MASTER-Net observations report
  26. GRB 210824A: BOOTES-5/JGT optical upper limit
  27. GRB 210824A: Fermi GBM Observation
  28. GRB 210824A: Nanshan/NEXT optical upper limit
  29. GRB 210824A: Swift-XRT refined Analysis
  30. GRB 210822A: GROND observations
  31. GRB 210824A: Enhanced Swift-XRT position
  32. GRB 210824A: Swift detection of a burst
  33. GRB 210822A: Detection by GRBAlpha
  34. GRB 210822A: GECAM refined analysis
  35. GRB 210820A: GROND observations
  36. Konus-Wind detection of GRB 210822A
  37. GRB 210822A: AstroSat CZTI detection
  38. GRB 210822A: Swift-XRT refined Analysis
  39. GRB 210822A: Swift-BAT refined analysis
  40. GRB 210822A: Fermi-LAT detection
  41. GRB 210820A: Swift/UVOT Detection
  42. GRB 210822A: Enhanced Swift-XRT position
  43. Swift GRB 210822A: Global MASTER-Net observations report
  44. GRB 210822A: KAIT Optical Afterglow Confirmation
  45. GRB 210822A: GECAM detection
  46. GRB 210822A: Swift detection of a burst with an optical afterglow
  47. GRB 210820A: Swift-BAT refined analysis
  48. GRB 210820A: LT optical upper limit
  49. GRB 210820A: LCO Optical Upper Limit
  50. GRB 210820A: RATIR Optical Detections
  51. GRB 210820A: NOT optical upper limit
  52. GRB 210820A: Nanshan/NEXT optical upper limit
  53. GRB 210820A: Swift-XRT refined Analysis
  54. GRB 210820A: Enhanced Swift-XRT position
  55. Swift GRB 210820A: Global MASTER-Net observations report
  56. GRB 210820A: Swift detection of a burst with an optical counterpart
  57. Swift GRB210818.68: Global MASTER-Net observations report
  58. Swift GRB 210818A: Global MASTER-Net observations report
  59. GRB 210818A: Swift-XRT refined Analysis
  60. GRB 210818A: Swift-BAT refined analysis
  61. Konus-Wind detection of GRB 210818A
  62. Swift Trigger 1069242 is Cyg X-1
  63. GRB 210818A: AstroSat CZTI detection
  64. GRB 210818A: AGILE detection
  65. GRB 210818A: Enhanced Swift-XRT position
  66. GRB 210818A: Swift detection of a burst with an optical counterpart
  67. GRB 210712A: Fermi GBM observation
  68. SGR 1935+2154: SPI INTEGRAL observations on 2021 August 5
  69. GRB 210807C: Swift-BAT refined analysis
  70. GRB 210807A: Detection by GRBAlpha
  71. GRB 210807A: Swift-BAT refined analysis
  72. GRB 210802A: Further Swift/XRT observation and afterglow confirmation
  73. GRB 210807C: Swift-XRT refined Analysis
  74. GRB 210807C: Fermi GBM detection
  75. GRB 210807C: Swift/UVOT Upper Limits
  76. GRB 210807A: Swift/UVOT Detection
  77. GRB 210807A: Swift-XRT refined Analysis
  78. GRB 210807C: Enhanced Swift-XRT position
  79. Swift GRB210807.74: Global MASTER-Net observations report
  80. Swift GRB210807.96: Global MASTER-Net observations report
  81. GRB 210807C: Swift detection of a burst
  82. Swift GRB 210807A: Global MASTER-Net observations report
  83. Swift GRB210807.79: Global MASTER-Net observations report
  84. Swift GRB210807.78: Global MASTER-Net observations report
  85. GRB 210807A: Enhanced Swift-XRT position
  86. GRB 210807A: BOOTES-5/JGT optical afterglow detection
  87. GRB 210807A: Swift detection of a burst with an optical counterpart
  88. IPN Triangulation of a bright burst from SGR 1935+2154
  89. GRB 210802A: BOOTES-2/TELMA optical upper limit
  90. GRB 210802A: Swift-XRT afterglow detection
  91. GRB 210802A: Fermi-LAT detection
  92. GRB 210802A: Tiled Swift observations
  93. GRB 210731A: continued GROND observations
  94. GRB 210731A: KAIT Optical Detection
  95. GRB 210731A: Swift-BAT refined analysis
  96. GRB 210731A: MASTER optical afterglow detection
  97. GRB 210731A: Swift-XRT refined Analysis
  98. GRB 210731A: GROND observations
  99. GRB 210731A: Fermi GBM Observation
  100. GRB 210731A: Swift/UVOT Detection of an optical afterglow

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