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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"

26764 results found.

  1. GRB 051021 Optical Observations
  2. GRB 051117B: MARGE Optical Limits
  3. GRB 051117A: Refined analysis of the Swift-BAT burst
  4. GRB 051117B: Refined analysis of the Swift-BAT burst
  5. GRB051117A : XRT refined analysis
  6. GRB 051117B,optical observation
  7. GRB 051117B: Optical observations
  8. GRB 051117B: ROTSE-III Optical Limits
  9. GRB051117B: Swift XRT position
  10. GRB 051117B: Swift detection of a burst
  11. GRB 051117: Swift detection of a bright burst
  12. GRB051114: results of the Swift-XRT observation
  13. GRB 051028 Optical Observations
  14. GRB 051114: Radio Observations
  15. GRB 051114: Swift-BAT refined analysis
  16. GRB050925: analysis of the XMM-Newton observation
  17. GRB 051114: Swift-BAT detection of a short burst
  18. GRB 051113: Swift-BAT refined analysis
  19. GRB 051113: Swift-BAT detection of a burst
  20. GRB 051111: AEOS optical observations
  21. GRB/SGR 050925: XMM-Newton ToO observation
  22. GRB051111: Swift/UVOT Observations
  23. GRB051111: XRT preliminary analysis
  24. GRB 051111: Swift-BAT refined analysis
  25. GRB 051109A Optical Observations
  26. GRB051111a: SARA Observations
  27. GRB 051111A: KAIT optical observations
  28. GRB051111: Super-LOTIS Early Detection
  29. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  30. Faulkes Telescope R-band detection of GRB051111
  31. GRB051111: Swift-BAT detection of a bright burst
  32. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  33. GRB 051109B. Radio Observations
  34. GRB 051105a: GETS optical limit
  35. GRB 051109b: GETS observation
  36. Early RAPTOR measurements of GRB 051109a - the movie.
  37. Konus-Wind observation of GRB 051109A
  38. GRB 051109B: Swift-BAT refined analysis
  39. GRB 051109B: ROTSE-III Optical Limits
  40. GRB 051109A: Swift-UVOT Observations
  41. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  42. GRB051109B: no UVOT source detected
  43. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  44. GRB051109B: XRT position
  45. GRB 051109B: Super-LOTIS Observations
  46. GRB 051109B Kiso optical follow-up observation
  47. GRB 051109B: Swift detection of a burst
  48. GRB 051109: HET Optical Spectrum and Absorption Redshift
  49. GRB051109: Early Super-LOTIS Detection
  50. GRB 051109: Swift-BAT refined analysis
  51. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  52. GRB051109: Swift detection of a burst
  53. GRB 051109a: IR Detections
  54. GRB 051109: ROTSE-III Detection of Possible Counterpart
  55. GRB051105B: Swift/XRT upper limit
  56. GRB051105B: Swift/UVOT upper limit
  57. GRB051103: optical observations
  58. GRB051028: Swift-XRT refined analysis
  59. GRB 051105a, observation from Naini Tal and OSN
  60. GRB 051105a: MDM Observations
  61. GRB051105A: Swift/UVOT Observations
  62. GRB 051105A, radio observations
  63. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  64. XRT observations of GRB 051105A
  65. GRB 051105: Swift-BAT improved refined analysis
  66. GRB 051105b: ART optical limits
  67. GRB 051105B (INTEGRAL 2701): Optical observation
  68. GRB 051105: Swift-BAT refined analysis
  69. GRB 051105: Optical limit
  70. GRB 051105: Swift detection of a short burst
  71. Konus-Wind observation of GRB 051028
  72. GRB051028 SARA Observation
  73. GRB051028: optical observations
  74. GRB051028: Swift/UVOT upper limits
  75. GRB051028: WHT optical candidate
  76. GRB051028: Swift XRT Position
  77. GRB051021B: Swift/UVOT Upper limits
  78. GRB 051021, Optical Observations
  79. GRB051012: Swift-XRT analysis
  80. GRB051021B: Swift XRT refined analysis
  81. GRB 051022: Swift/UVOT Upper Limits
  82. Konus-Wind observation of GRB 051022
  83. GRB051022: Swift XRT Position
  84. GRB 051022 (=H3950): SXC Flight Localization is Valid
  85. GRB051021: Swift/UVOT Upper Limits
  86. GRB 051021B: Refined analysis of the Swift-BAT burst
  87. GRB051022,optical observation
  88. GRB 051022A: ROTSE-III Optical Limits
  89. GRB 051022: Optical observations
  90. GRB 051021,optical observation
  91. GRB051021B: Swift XRT Position
  92. GRB 051021B: Swift detection of a burst
  93. GRB051021: Swift XRT analysis
  94. GRB051021 (=H3947): Refined Analysis
  95. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  96. Swift-BAT trigger 160640 is not a real GRB
  97. GRB051021: A GRB Localized by HETE
  98. Swift-BAT trigger 160619 is not a GRB
  99. Swift-BAT triggered on a posible CR Shower or possible GRB
  100. GRB 051016b: Optical limit

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