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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"

21525 results found.

  1. GRB 220921A: Swift-XRT Observations
  2. GRB 220921A: Fermi-LAT detection
  3. GRB 220921A: Tiled Swift observations
  4. GRB 220909A: Fermi GBM observation
  5. GRB 220909A: Swift-XRT observations
  6. IPN triangulation of GRB 220905A
  7. GRB 220909A: Swift ToO observations
  8. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  9. GRB 220907A: Swift-BAT refined analysis
  10. GRB 220831A: Gemini-South/GMOS detection of potential optical counterpart
  11. IPN triangulation of GRB 220903A (long)
  12. GRB 220907A: Fermi GBM observation
  13. GRB 220907A: Nanshan/NEXT optical upper limits
  14. GRB 220907A: Swift/UVOT Upper Limits
  15. GRB 220907A: Swift-XRT refined Analysis
  16. GRB 220831A: ATCA 5/9 GHz radio observations
  17. GRB 220907A: Swift-XRT position
  18. GRB 220907A: Swift detection of a burst
  19. Swift GRB220907.59: Global MASTER-Net observations report
  20. GRB 220831A: Swift-UVOT Upper Limits
  21. GRB 220831A: DECam detection of a possible optical counterpart
  22. GRB 220831A, VLT/HAWK-I near-infrared observations
  23. GRB 220831A: Fermi GBM observation
  24. GRB 220831A: Swift-XRT observations
  25. GRB 220831A: Swift ToO observations
  26. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  27. Konus-Wind detection of GRB 220826A
  28. GRB 220826A: Swift-BAT refined analysis
  29. GRB 220826A: Fermi GBM observation
  30. GRB 220826A: Swift-XRT refined Analysis
  31. GRB 220825A: Fermi GBM observation
  32. GRB 220826A: Lesedi optical afterglow detection
  33. GRB 220826A: Swift/UVOT Detection
  34. Swift GRB 220826A: Global MASTER-Net observations report
  35. GRB 220826A: Enhanced Swift-XRT position
  36. GRB 220826A: Swift detection of a burst with an optical counterpart
  37. GRB 220825A: Swift/BAT-GUANO detection
  38. GRB 220823A: Fermi GBM detection
  39. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  40. Konus-Wind detection of GRB 220813A
  41. GRB 220813A: VLT optical observations and possible host galaxy
  42. GRB 220813A: Swift/UVOT Detection
  43. GRB 220810A: Further Swift-XRT observations
  44. GRB 220813A: Swift-XRT refined Analysis
  45. Swift GRB 220813A: Global MASTER-Net observations report
  46. GRB 220813A: Enhanced Swift-XRT position
  47. GRB 220813A: Swift detection of a burst with an optical counterpart
  48. GRB 220810A: Swift-XRT observations
  49. GRB 220810A: Swift ToO observations
  50. GRB 220806A: Swift-BAT refined analysis
  51. GRB 220806A: Swift detection of a burst
  52. Swift GRB220806.76: Global MASTER-Net observations report
  53. Konus-Wind detection of GRB 220730A (short)
  54. GRB 220730A: Swift-BAT refined analysis
  55. GRB 220730A: Fermi GBM detection
  56. GRB 220730A: Swift-XRT afterglow detection
  57. GRB 220730A: Swift/UVOT Upper Limits
  58. GRB 220730A: Swift-XRT observations
  59. Swift GRB 220730A: Global MASTER-Net observations report
  60. GRB 220730A: Swift detection of a short hard burst
  61. GRB 220715B: VIRT Optical Upper Limit
  62. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  63. GRB 220715B: Swift-BAT refined analysis
  64. GRB220714B: UVOT detections
  65. GRB 220715B: Fermi GBM detection
  66. GRB 220715B: Swift-XRT refined Analysis
  67. GRB 220715B: Swift/UVOT Upper Limits
  68. GRB 220715B: Enhanced Swift-XRT position
  69. GRB 220715B: BOOTES-network optical upper limits
  70. Swift GRB 220715B: Global MASTER-Net observations report
  71. GRB 220715B: Prompt enhanced Swift-XRT position
  72. GRB 220715B: Swift detection of a burst
  73. GRB 220714B: Swift-BAT refined analysis
  74. GRB 220714B: Fermi GBM observation
  75. GRB 220714B: LCO Optical Observations
  76. GRB 220714B: Swift-XRT refined Analysis
  77. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  78. GRB 220714B: UVOT afterglow discovery
  79. GRB 220714B: Enhanced Swift-XRT position
  80. GRB 220714B: Swift detection of a burst
  81. GRB 220714A: Possible Swift detection of a burst
  82. GRB 220710A: Swift/UVOT Upper Limits
  83. GRB 220711C: Fermi GBM Observation
  84. GRB 220710A: Swift-XRT afterglow detection
  85. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  86. GRB 220711B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  87. GRB 220711B: GIT optical upper limits
  88. GRB 220712B: NOT optical afterglow confirmation
  89. GRB 220710A: Swift ToO observations
  90. GRB 220710A: Swift/BAT-GUANO arcminute localization
  91. GRB 220711B: Swift-BAT refined analysis
  92. IPN triangulation of GRB 220711C (short)
  93. GRB 220711B: Swift-XRT refined Analysis
  94. GRB 220711B: Swift/UVOT Upper Limits
  95. GRB 220711B: Enhanced Swift-XRT position
  96. GRB 220711B: Fermi GBM Detection
  97. GRB 220711B: NOT optical observations
  98. GRB 220711B: LCO Optical Upper Limits
  99. GRB 220711B: Swift detection of a burst
  100. GRB 220708B: GIT optical upper limits

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