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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 130831A: ISON-UAFO optical observations
  2. GRB 130907A: MASTER early OT observations
  3. GRB 130907A: Swift detection of a burst with an optical counterpart
  4. Swift follow-up results of the possible weak INTEGRAL GRB
  5. GRB 130903A: Swift/UVOT Upper Limits
  6. Swift follow-up of an INTEGRAL possible weak GRB
  7. GRB 130831A: RATIR Optical and NIR Upper Limits
  8. GRB 130903A: Fermi GBM observation
  9. GRB 130903A: Swift-XRT observations
  10. Swift trigger 569022 is a new Galactic source Swift J1734.5-3027
  11. GRB 130831A: Swift/UVOT Observations
  12. GRB 130831A: Montarrenti Observatory optical follow-up
  13. GRB 130831A: RATIR Optical and NIR Observations
  14. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  15. GRB 130831B, Swift-BAT refined analysis
  16. GRB 130831A: VLA Observations
  17. GRB 130831A: T100 observations
  18. GRB 130831B: Swift/UVOT Upper Limits
  19. GRB 130831B: GROND upper limits
  20. Swift Trigger 569022: a possible GRB
  21. GRB 130831A: THO optical observation
  22. GRB 130831A, Swift-BAT refined analysis
  23. GRB 130831B: Swift-XRT refined Analysis
  24. GRB 130831A: Swift-XRT refined Analysis
  25. GRB 130831A: Montarrenti Observatory optical observations
  26. GRB 130831B: Enhanced Swift-XRT position
  27. GRB 130831A: Skynet/PROMPT-SSO detections
  28. GRB 130831A: Enhanced Swift-XRT position
  29. Konus-Wind observation of GRB 130831A
  30. GRB 130831B: Swift detection of a burst
  31. GRB 130831A: Faulkes Telescope North and South optical afterglow
  32. GRB 130831A: Swift detection of a burst with an optical counterpart
  33. IPN triangulation of GRB 130828A - error box
  34. GRB 130822A: optical upper limits
  35. GRB 130829A: AAO optical observations
  36. GRB 130828A: Swift XRT and UVOT observations
  37. IPN triangulation of GRB 130828A
  38. GRB 130829A: Swift detection of a burst
  39. GRB 130828A Tiled Swift observations
  40. IPN triangulation of GRB130821A
  41. GRB 130822A Swift-BAT Spectral lag analysis
  42. GRB 130821A: Swift-XRT observation
  43. GRB 130822A: Gemini Observations
  44. GRB 130822A: Swift-XRT refined Analysis
  45. GRB 130822A: Swift/UVOT Upper Limits
  46. GRB 130822A: Enhanced Swift-XRT position
  47. GRB 130822A, Swift-BAT refined analysis
  48. GRB 130821A: Fermi-LAT detection of a burst
  49. GRB 130822A: Swift detection of a short burst
  50. GRB 130816A: Swift/UVOT Upper Limits
  51. GRB 130816B: Swift/UVOT Upper Limits
  52. GRB 130816B, Swift-BAT refined analysis
  53. GRB 130816B: GROND afterglow candidate
  54. GRB 130816A: Swift-XRT refined Analysis
  55. GRB 130816A, Swift-BAT refined analysis
  56. GRB 130816A: Fermi GBM observation
  57. GRB 130816B: Swift-XRT refined Analysis
  58. GRB 130816B: Enhanced Swift-XRT position
  59. GRB 130816A: GROND confirmation of afterglow
  60. GRB 130816A: Enhanced Swift-XRT position
  61. GRB 130816B: Swift detection of a burst
  62. GRB 130816A: Swift detection of a burst
  63. Refined IPN Triangulation of GRB 130812B
  64. IPN Triangulation of GRB 130812B (long/soft)
  65. GRB 130812A: Swift/UVOT Upper Limits
  66. GRB 130812A, Swift-BAT refined analysis
  67. GRB 130812A: GROND upper limits
  68. GRB 130812A: Swift-XRT refined Analysis
  69. GRB 130812A: Enhanced Swift-XRT position
  70. GRB 130812A: Swift detection of a burst
  71. Correction to GCN Circ. 15086 "GRB130807A: Swift/UVOT observations"
  72. GRB130807A: Swift/UVOT observations
  73. GRB 130807A: Swift-XRT refined analysis
  74. GRB 130806A: Swift/UVOT Upper Limits
  75. GRB 130807A, Swift-BAT refined analysis
  76. GRB 130807A: Swift detection of a GRB or Galactic transient
  77. GRB 130623A: GROND detection of the optical/NIR afterglow
  78. GRB 130806A: Swift-XRT refined Analysis
  79. GRB 130806A, Swift-BAT refined analysis
  80. IPN localization of GRB 130804A
  81. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  82. GRB130803A: GROND observations
  83. GRB 130806A: Enhanced Swift-XRT position
  84. GRB 130806A: Swift detection of a burst
  85. Trigger 565443: Swift detection of a burst from SGR J1745-29
  86. GRB 130803A: Swift-XRT refined Analysis
  87. GRB 130803A: RATIR Optical and NIR Observations
  88. GRB130803A: GROND detection of possible host
  89. GRB 130803A: Swift/UVOT Upper Limits
  90. GRB 130803A; Fermi GBM observation
  91. GRB 130803A, Swift-BAT refined analysis
  92. GRB 130803A: Enhanced Swift-XRT position
  93. GRB 130803A: Faulkes Telescope South Observations
  94. GRB 130803A: Swift detection of a burst
  95. GRB 130727A: Watcher optical limit
  96. GRB 130727A: Swift/UVOT Detection
  97. Konus-Wind observation of GRB 130727A
  98. GRB 130727A: Swift-XRT refined Analysis
  99. GRB 130727A: Fermi GBM detection
  100. GRB 130727A: GROND observations

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