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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"

27408 results found.

  1. GRB051103: optical observations
  2. GRB051028: Swift-XRT refined analysis
  3. GRB 051105a, observation from Naini Tal and OSN
  4. GRB 051105a: MDM Observations
  5. GRB051105A: Swift/UVOT Observations
  6. GRB 051105A, radio observations
  7. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  8. XRT observations of GRB 051105A
  9. GRB 051105: Swift-BAT improved refined analysis
  10. GRB 051105b: ART optical limits
  11. GRB 051105B (INTEGRAL 2701): Optical observation
  12. GRB 051105: Swift-BAT refined analysis
  13. GRB 051105: Optical limit
  14. GRB 051105: Swift detection of a short burst
  15. Konus-Wind observation of GRB 051028
  16. GRB051028 SARA Observation
  17. GRB051028: optical observations
  18. GRB051028: Swift/UVOT upper limits
  19. GRB051028: WHT optical candidate
  20. GRB051028: Swift XRT Position
  21. GRB051021B: Swift/UVOT Upper limits
  22. GRB 051021, Optical Observations
  23. GRB051012: Swift-XRT analysis
  24. GRB051021B: Swift XRT refined analysis
  25. GRB 051022: Swift/UVOT Upper Limits
  26. Konus-Wind observation of GRB 051022
  27. GRB051022: Swift XRT Position
  28. GRB 051022 (=H3950): SXC Flight Localization is Valid
  29. GRB051021: Swift/UVOT Upper Limits
  30. GRB 051021B: Refined analysis of the Swift-BAT burst
  31. GRB051022,optical observation
  32. GRB 051022A: ROTSE-III Optical Limits
  33. GRB 051022: Optical observations
  34. GRB 051021,optical observation
  35. GRB051021B: Swift XRT Position
  36. GRB 051021B: Swift detection of a burst
  37. GRB051021: Swift XRT analysis
  38. GRB051021 (=H3947): Refined Analysis
  39. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  40. Swift-BAT trigger 160640 is not a real GRB
  41. GRB051021: A GRB Localized by HETE
  42. Swift-BAT trigger 160619 is not a GRB
  43. Swift-BAT triggered on a posible CR Shower or possible GRB
  44. GRB 051016b: Optical limit
  45. GRB 051016A: Swift/UVOT upper limits
  46. GRB 051016B: Swift/UVOT detection
  47. GRB 051016B: Refined analysis of the Swift-BAT burst
  48. GRB 051016B: Swift detection of a soft burst
  49. GRB 051016: Swift-BAT refined analysis
  50. GRB051016: Swift detection of a burst
  51. GRB 051012: Swift-BAT detection of burst yesterday
  52. Swift trigger 159578 is not a burst
  53. Swift-BAT Trigger 159578 is a possible burst
  54. GRB050805A: Rc optical observations
  55. GRB 051006: Swift/UVOT Upper Limits
  56. GRB051008: Swift XRT refined analysis
  57. GRB051008 - Swift UVOT upper limits
  58. Konus-Wind observation of GRB 051008
  59. GRB051008: Final refined analysis of the Swift-BAT burst
  60. GRB051008: Refined analysis of the Swift-BAT burst
  61. GRB051008: Radio Observation
  62. GRB 051008: Swift XRT position
  63. GRB 051008: early Swift XRT analysis
  64. GRB 051008: Swift UVOT Candidate
  65. GRB051008: Swift-BAT detection of a bright burst
  66. GRB 051006: XRT refined analysis
  67. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  68. GRB 051006: optical observations at Sierra Nevada
  69. GRB051006: Refined analysis of the Swift-BAT burst
  70. GRB 051006: XRT position
  71. GRB051006: Swift detection of a burst
  72. GRB 050906, summary of radio observations
  73. Swift-BAT triggers 158261 and 158262 Retraction
  74. GRB051001: Swift UVOT Upper Limits
  75. GRB 050925: Second Epoch WSRT Radio Observations
  76. GRB 051001: Swift XRT refined analysis
  77. GRB 051001: I-band limit
  78. GRB 051001: AAT infra-red observations
  79. GRB 051001: Swift-BAT refined analysis
  80. GRB 051001: Swift Detection of a Burst
  81. GRB 051001: ROTSE-III Optical Limits
  82. GRB050922C: UVES/VLT high resolution spectroscopy
  83. GRB050925: Swift/XRT limits
  84. GRB050922C - Swift UVOT preliminary analysis
  85. GRB 050925: WSRT Radio Observations
  86. GRB050925: Swift UVOT upper limits
  87. Refined analysis of the Swift-BAT soft short burst
  88. GRB050925: Faulkes Telescope North R-band limit
  89. GRB050925: Swift-BAT detection of a short burst
  90. GRB 050922B: Correction to BAT refined analysis, longer burst
  91. GRB050922C: TNG spectroscopic observations
  92. GRB050922B: refined XRT analysis
  93. Konus-Wind observation of GRB 050922C
  94. GRB050922B: Swift UVOT early upper limits.
  95. GRB OT observation
  96. GRB050922C: observation at MonteBoo
  97. GRB 050922B: optical limit
  98. GRB 050922C: Swift XRT refined analysis
  99. HETE Fregate observations of GRB 050922C
  100. GRB 050922C: Swift-BAT refined analysis

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