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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"

19644 results found.

  1. GRB 220930A: COATLI Upper Limits
  2. GRB 220930A: Swift detection of a burst
  3. IPN triangulation of GRB 220927A (long)
  4. GRB 220924A: Fermi GBM detection
  5. Swift Trigger 1125354 (GRB 220926A) is not a GRB
  6. Swift GRB220926.34: Global MASTER-Net observations report
  7. Swift GRB 220926A: Global MASTER-Net observations report
  8. GRB 220926A: Swift detection of a burst
  9. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  10. Swift GRB220923.47: Global MASTER-Net observations report
  11. GRB 220921A: MeerLICHT afterglow observations
  12. GRB 220921A: Swift-XRT Observations
  13. GRB 220921A: Fermi-LAT detection
  14. GRB 220921A: Tiled Swift observations
  15. GRB 220909A: Fermi GBM observation
  16. GRB 220909A: Swift-XRT observations
  17. IPN triangulation of GRB 220905A
  18. GRB 220909A: Swift ToO observations
  19. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  20. GRB 220907A: Swift-BAT refined analysis
  21. GRB 220831A: Gemini-South/GMOS detection of potential optical counterpart
  22. IPN triangulation of GRB 220903A (long)
  23. GRB 220907A: Fermi GBM observation
  24. GRB 220907A: Nanshan/NEXT optical upper limits
  25. GRB 220907A: Swift/UVOT Upper Limits
  26. GRB 220907A: Swift-XRT refined Analysis
  27. GRB 220831A: ATCA 5/9 GHz radio observations
  28. GRB 220907A: Swift-XRT position
  29. GRB 220907A: Swift detection of a burst
  30. Swift GRB220907.59: Global MASTER-Net observations report
  31. GRB 220831A: Swift-UVOT Upper Limits
  32. GRB 220831A: DECam detection of a possible optical counterpart
  33. GRB 220831A, VLT/HAWK-I near-infrared observations
  34. GRB 220831A: Fermi GBM observation
  35. GRB 220831A: Swift-XRT observations
  36. GRB 220831A: Swift ToO observations
  37. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  38. Konus-Wind detection of GRB 220826A
  39. GRB 220826A: Swift-BAT refined analysis
  40. GRB 220826A: Fermi GBM observation
  41. GRB 220826A: Swift-XRT refined Analysis
  42. GRB 220825A: Fermi GBM observation
  43. GRB 220826A: Lesedi optical afterglow detection
  44. GRB 220826A: Swift/UVOT Detection
  45. Swift GRB 220826A: Global MASTER-Net observations report
  46. GRB 220826A: Enhanced Swift-XRT position
  47. GRB 220826A: Swift detection of a burst with an optical counterpart
  48. GRB 220825A: Swift/BAT-GUANO detection
  49. GRB 220823A: Fermi GBM detection
  50. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  51. Konus-Wind detection of GRB 220813A
  52. GRB 220813A: VLT optical observations and possible host galaxy
  53. GRB 220813A: Swift/UVOT Detection
  54. GRB 220810A: Further Swift-XRT observations
  55. GRB 220813A: Swift-XRT refined Analysis
  56. Swift GRB 220813A: Global MASTER-Net observations report
  57. GRB 220813A: Enhanced Swift-XRT position
  58. GRB 220813A: Swift detection of a burst with an optical counterpart
  59. GRB 220810A: Swift-XRT observations
  60. GRB 220810A: Swift ToO observations
  61. GRB 220806A: Swift-BAT refined analysis
  62. GRB 220806A: Swift detection of a burst
  63. Swift GRB220806.76: Global MASTER-Net observations report
  64. Konus-Wind detection of GRB 220730A (short)
  65. GRB 220730A: Swift-BAT refined analysis
  66. GRB 220730A: Fermi GBM detection
  67. GRB 220730A: Swift-XRT afterglow detection
  68. GRB 220730A: Swift/UVOT Upper Limits
  69. GRB 220730A: Swift-XRT observations
  70. Swift GRB 220730A: Global MASTER-Net observations report
  71. GRB 220730A: Swift detection of a short hard burst
  72. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  73. GRB 220715B: Swift-BAT refined analysis
  74. GRB220714B: UVOT detections
  75. GRB 220715B: Fermi GBM detection
  76. GRB 220715B: Swift-XRT refined Analysis
  77. GRB 220715B: Swift/UVOT Upper Limits
  78. GRB 220715B: Enhanced Swift-XRT position
  79. GRB 220715B: BOOTES-network optical upper limits
  80. Swift GRB 220715B: Global MASTER-Net observations report
  81. GRB 220715B: Prompt enhanced Swift-XRT position
  82. GRB 220715B: Swift detection of a burst
  83. GRB 220714B: Swift-BAT refined analysis
  84. GRB 220714B: Fermi GBM observation
  85. GRB 220714B: LCO Optical Observations
  86. GRB 220714B: Swift-XRT refined Analysis
  87. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  88. GRB 220714B: UVOT afterglow discovery
  89. GRB 220714B: Enhanced Swift-XRT position
  90. GRB 220714B: Swift detection of a burst
  91. GRB 220714A: Possible Swift detection of a burst
  92. GRB 220710A: Swift/UVOT Upper Limits
  93. GRB 220711C: Fermi GBM Observation
  94. GRB 220710A: Swift-XRT afterglow detection
  95. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  96. GRB 220711B: GIT optical upper limits
  97. GRB 220710A: Swift ToO observations
  98. GRB 220710A: Swift/BAT-GUANO arcminute localization
  99. GRB 220711B: Swift-BAT refined analysis
  100. IPN triangulation of GRB 220711C (short)

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