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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

26232 results found.

  1. GRB051103: optical observations
  2. GRB051028: Swift-XRT refined analysis
  3. GRB051105A: Swift/UVOT Observations
  4. XRT observations of GRB 051105A
  5. GRB 051105b: ART optical limits
  6. GRB 051105B (INTEGRAL 2701): Optical observation
  7. GRB 051105: Swift-BAT refined analysis
  8. GRB 051105: Swift detection of a short burst
  9. Konus-Wind observation of GRB 051028
  10. GRB051028 SARA Observation
  11. GRB051028: optical observations
  12. GRB051028: Swift/UVOT upper limits
  13. GRB051028: WHT optical candidate
  14. GRB051028: Swift XRT Position
  15. GRB051021B: Swift/UVOT Upper limits
  16. GRB 051021, Optical Observations
  17. GRB051012: Swift-XRT analysis
  18. GRB051021B: Swift XRT refined analysis
  19. GRB 051022, mm counterpart
  20. GRB 051022: Swift/UVOT Upper Limits
  21. Konus-Wind observation of GRB 051022
  22. GRB051022: Swift XRT Position
  23. GRB 051022 (=H3950): SXC Flight Localization is Valid
  24. GRB051021: Swift/UVOT Upper Limits
  25. GRB 051021B: Refined analysis of the Swift-BAT burst
  26. GRB051022,optical observation
  27. GRB 051022A: ROTSE-III Optical Limits
  28. GRB 051022: Optical observations
  29. GRB 051021,optical observation
  30. GRB051021B: Swift XRT Position
  31. GRB 051021B: Swift detection of a burst
  32. GRB051021: Swift XRT analysis
  33. GRB051021 (=H3947): Refined Analysis
  34. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  35. Swift-BAT trigger 160640 is not a real GRB
  36. GRB051021: A GRB Localized by HETE
  37. Swift-BAT trigger 160619 is not a GRB
  38. Swift-BAT triggered on a posible CR Shower or possible GRB
  39. GRB 051016b: Optical limit
  40. GRB 051016A: Swift/UVOT upper limits
  41. GRB 051016B: Swift/UVOT detection
  42. GRB 051016B: Refined analysis of the Swift-BAT burst
  43. GRB 051016B: Swift detection of a soft burst
  44. GRB 051016: Swift-BAT refined analysis
  45. GRB051016: Swift detection of a burst
  46. GRB 051012: Swift-BAT detection of burst yesterday
  47. Swift trigger 159578 is not a burst
  48. Swift-BAT Trigger 159578 is a possible burst
  49. GRB050805A: Rc optical observations
  50. GRB 051006: Swift/UVOT Upper Limits
  51. GRB051008: Swift XRT refined analysis
  52. GRB051008 - Swift UVOT upper limits
  53. Konus-Wind observation of GRB 051008
  54. GRB051008: Final refined analysis of the Swift-BAT burst
  55. GRB051008: Refined analysis of the Swift-BAT burst
  56. GRB 051008: Swift XRT position
  57. GRB 051008: early Swift XRT analysis
  58. GRB 051008: Swift UVOT Candidate
  59. GRB051008: Swift-BAT detection of a bright burst
  60. GRB 051006: XRT refined analysis
  61. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  62. GRB051006: Refined analysis of the Swift-BAT burst
  63. GRB 051006: XRT position
  64. GRB051006: Swift detection of a burst
  65. GRB051001: Swift UVOT Upper Limits
  66. GRB 051001: Swift XRT refined analysis
  67. GRB 051001: I-band limit
  68. GRB 051001: AAT infra-red observations
  69. GRB 051001: Swift-BAT refined analysis
  70. GRB 051001: Swift Detection of a Burst
  71. GRB 051001: ROTSE-III Optical Limits
  72. GRB050922C: UVES/VLT high resolution spectroscopy
  73. GRB050925: Swift/XRT limits
  74. GRB050922C - Swift UVOT preliminary analysis
  75. GRB050925: Swift UVOT upper limits
  76. Refined analysis of the Swift-BAT soft short burst
  77. GRB050925: Faulkes Telescope North R-band limit
  78. GRB050925: Swift-BAT detection of a short burst
  79. GRB050922C: TNG spectroscopic observations
  80. GRB050922B: refined XRT analysis
  81. Konus-Wind observation of GRB 050922C
  82. GRB050922B: Swift UVOT early upper limits.
  83. GRB OT observation
  84. GRB050922C: observation at MonteBoo
  85. GRB 050922B: optical limit
  86. GRB 050922C: Swift XRT refined analysis
  87. HETE Fregate observations of GRB 050922C
  88. GRB 050922C: Swift-BAT refined analysis
  89. GRB 050922B: Swift-BAT refined analysis
  90. GRB050922C: optical observations
  91. GRB 050922C: optical obserations
  92. GRB 050922C: NOT optical observations
  93. GRB 050922C: Swift detection of a bright burst
  94. GRB 050922C: ROTSE-IIId Refined Analysis
  95. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  96. GRB 050922B: ROTSE-III Optical Limits
  97. GRB 050922B,optical observation
  98. GRB050922B: Swift-BAT detection of a weak long burst
  99. Possible GRB 050922 detected by INTEGRAL
  100. GRB050916: Swift/UVOT Upper Limits

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