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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"

11504 results found.

  1. Early RAPTOR measurements of GRB 051109a - the movie.
  2. Konus-Wind observation of GRB 051109A
  3. GRB 051109B: ROTSE-III Optical Limits
  4. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  5. GRB051105B: REM Optical observation
  6. GRB 051109B: Swift detection of a burst
  7. GRB 051109: Swift-BAT refined analysis
  8. GRB051109: Swift detection of a burst
  9. GRB 051105a: MDM Observations
  10. GRB 051105A: TNG optical observations
  11. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  12. GRB051105B - A long GRB detected by INTEGRAL
  13. Konus-Wind observation of GRB 051028
  14. GRB051028:MASTER correction and final results
  15. GRB 051022: RTT150 optical observations
  16. GRB051028: Swift/UVOT upper limits
  17. GRB051028: Swift XRT Position
  18. GRB051022: Swift XRT measurement of jet break
  19. SGR 1806-20: continued moderate activity seen with INTEGRAL
  20. Chandra Observations of GRB 051022
  21. GRB 051022 Chandra Observations scheduled
  22. Konus-Wind observation of GRB 051022
  23. GRB 051022 (=H3950): SXC Flight Localization is Valid
  24. GRB 051021B: Refined analysis of the Swift-BAT burst
  25. GRB 051022A: ROTSE-III Optical Limits
  26. GRB 050502b: Optical limit
  27. GRB 051016B: refined analysis of the Swift/XRT data
  28. GRB 051016: LCO optical and near-IR imaging
  29. GRB050805A: Rc optical observations
  30. GRB 051008 - a low redshift low-luminosity burst?
  31. Konus-Wind observation of GRB 051008
  32. GRB 051008, optical observations
  33. GRB 051006: P60 Observations
  34. GRB 051006: XRT refined analysis
  35. GRB051006: Refined analysis of the Swift-BAT burst
  36. GRB 051006: XRT position
  37. GRB051006: Swift detection of a burst
  38. GRB 051001: Swift XRT refined analysis
  39. GRB 051001: AAT infra-red observations
  40. GRB 051001: ROTSE-III Optical Limits
  41. GRB050922C: optical observation
  42. GRB050922C: UVES/VLT high resolution spectroscopy
  43. GRB050925: Swift/XRT limits
  44. GRB050925: Swift-BAT detection of a short burst
  45. GRB 050922B: Correction to BAT refined analysis, longer burst
  46. Konus-Wind observation of GRB 050922C
  47. GRB050922C: Optical Observations
  48. GRB 050922C: Swift XRT refined analysis
  49. GRB 050922C: optical obserations
  50. GRB 050922C: ROTSE-IIId Refined Analysis
  51. GRB 050922B: ROTSE-III Optical Limits
  52. Possible GRB 050922 detected by INTEGRAL
  53. GRB050820B: analysis of the XMM-Newton observation
  54. GRB050916: Swift/UVOT Upper Limits
  55. GRB 050918 - A long GRB detected by INTEGRAL
  56. Swift-BAT trigger 155535 is definitely not a GRB
  57. GRB 050916: XRT position
  58. GRB050916: Swift-BAT detection of a long weak burst
  59. GRB 050915B: XRT position
  60. GRB050915B: Swift-BAT detection of a long bright burst
  61. GRB 050915: Swift-BAT refined analysis
  62. GRB050915: P60 Optical Observations
  63. GRB 050915: ROTSE-III optical limits
  64. Swift is in normal operation
  65. GRB 050911: Swift-BAT refined analysis
  66. GRB 050911: z~0.16 cluster in the field
  67. GRB050911: Swift-BAT detection of a long burst
  68. GRB 050910a: TAROT early optical limits
  69. GRB 050906: Possible X-ray Counterpart
  70. GRB 050908: Swift-BAT refined analysis
  71. GRB 050908: Optical observations
  72. GRB 050908: Prompt PROMPT Observations
  73. Swift trigger 154073 is not a GRB
  74. GRB050904: CrAO optical observations
  75. GRB 050906: Radio Observations
  76. GRB 050906: Bright galaxy in BAT error box
  77. GRB 050904: Swift/UVOT observations
  78. GRB 050904: early Swift XRT analysis results
  79. GRB 050827: P200 NIR Observations
  80. GRB050824, HETE-2 Observation
  81. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  82. GRB050824, I-band imaging
  83. GRB 050822: refined XRT analysis
  84. GRB 050824: XRT refined analysis and possible afterglow detection
  85. GRB 050824: ROTSE-III Optical Limits
  86. GRB050820A: RTT150 optical observations
  87. GRB 050822: Swift-BAT refined analysis
  88. GRB050820A: RTT150 optical observations
  89. GRB 050820a - corrections to GCN 3846
  90. GRB 050822: ROTSE-III Prompt Optical Limits
  91. GRB050820B: BAT-Swift detection of a bright GRB
  92. GRB 050820: High Resolution Spectroscopy from Keck
  93. GRB 050820: Swift detection of a GRB
  94. Swift-BAT trigger 150993 is not a GRB
  95. GRB 050815: ROTSE-III Optical Limits
  96. GRB050814: Fading red source
  97. GRB050814: P60 Optical Afterglow Candidate
  98. GRB 050814: XRT refined analysis
  99. GRB050814: Refined analysis of the Swift-BAT burst
  100. GRB 050814: Swift XRT Afterglow Localization

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