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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"

11405 results found.

  1. GRB 060116: PROMPT Observations
  2. GRB 060117: FRAM refined analysis
  3. GRB 060116: Refined analysis of the Swift-BAT burst
  4. GRB 060116: ROTSE-III Optical Limits
  5. GRB 060115: Refined analysis of the Swift-BAT burst
  6. GRB 060115: MITSuME optical afterglow candidate
  7. GRB 060115: Swift detection of a burst
  8. GRB 060114: A long GRB detected by INTEGRAL
  9. GRB 060111B: MITSuME detection of optical afterglow
  10. GRB 060110: MARGE observations
  11. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  12. GRB 060111B: Swift detection of a burst
  13. GRB 060111: TAROT optical observation
  14. GRB 060111: Swift detection of a burst
  15. GRB 060109: Swift-BAT refined analysis
  16. GRB060109, optical observation
  17. GRB060108: Swift detection of its 100th GRB
  18. Konus-Wind observation of GRB 060105
  19. GRB 060105: Mitsume optical observations
  20. GRB 060105: XRT refined analysis
  21. GRB 060102: Swift-BAT detection of a burst
  22. GRB051227: SARA Observations
  23. GRB 051227: Gemini observations
  24. GRB 051227: Magellan r'-band Imaging/Astrometry
  25. GRB 051227: refined analysis of VLT images
  26. GRB 051227: R-band object in the XRT error circle
  27. Konus-Wind observation of GRB 051221A
  28. GRB051221A: Suzaku WAM observation of the prompt emission
  29. GRB 051221A: Chandra Afterglow Position
  30. GRB 051221B: ROTSE-III Optical Limits
  31. GRB 051221A: RAPTOR Fading Counterpart Constraint
  32. GRB 051221B: BOOTES optical observations.
  33. Swift-BAT detection of a possible burst
  34. GRB 051211B: Swift XRT confirmation of the afterglow
  35. GRB 051211b: RTT150 optical observations
  36. GRB051211b: P60 Observations
  37. GRB 051211B: a long GRB detected by INTEGRAL
  38. IPN observations of SGR1806-20
  39. An extraordinary long burst on December 3 from SGR1806-20
  40. Possible resuming of the SGR 1806-20 activity
  41. GRB 051127: Swift-BAT detection of a possible burst
  42. GRB051117B: Swift XRT refined analysis
  43. GRB051111: Suzaku WAM observation of the prompt emission
  44. GRB051111: Rc optical observations
  45. GRB051008: Suzaku WAM observation of the prompt emission
  46. GRB 051021 Optical Observations
  47. GRB 051117B: ROTSE-III Optical Limits
  48. GRB 051117: Swift detection of a bright burst
  49. GRB050925: analysis of the XMM-Newton observation
  50. GRB 051111: Further spectroscopic analysis
  51. GRB/SGR 050925: XMM-Newton ToO observation
  52. GRB051111: Swift/UVOT Observations
  53. GRB 051111A: KAIT optical observations
  54. GRB051111: Swift-BAT detection of a bright burst
  55. GRB 051109b: GETS observation
  56. Early RAPTOR measurements of GRB 051109a - the movie.
  57. Konus-Wind observation of GRB 051109A
  58. GRB 051109B: ROTSE-III Optical Limits
  59. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  60. GRB051105B: REM Optical observation
  61. GRB 051109B: Swift detection of a burst
  62. GRB 051109: Swift-BAT refined analysis
  63. GRB051109: Swift detection of a burst
  64. GRB051103: MASTER: OT limit and host galaxy candidates
  65. GRB 051105a: MDM Observations
  66. GRB 051105A: TNG optical observations
  67. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  68. GRB051105B - A long GRB detected by INTEGRAL
  69. Konus-Wind observation of GRB 051028
  70. GRB051028:MASTER correction and final results
  71. GRB 051022: RTT150 optical observations
  72. GRB051028: Swift/UVOT upper limits
  73. GRB051028: Swift XRT Position
  74. GRB051022: Swift XRT measurement of jet break
  75. SGR 1806-20: continued moderate activity seen with INTEGRAL
  76. Chandra Observations of GRB 051022
  77. GRB 051022 Chandra Observations scheduled
  78. Konus-Wind observation of GRB 051022
  79. GRB 051022 (=H3950): SXC Flight Localization is Valid
  80. GRB 051021B: Refined analysis of the Swift-BAT burst
  81. GRB 051022A: ROTSE-III Optical Limits
  82. GRB 050502b: Optical limit
  83. GRB 051016B: refined analysis of the Swift/XRT data
  84. GRB 051016: LCO optical and near-IR imaging
  85. GRB050805A: Rc optical observations
  86. GRB 051008 - a low redshift low-luminosity burst?
  87. Konus-Wind observation of GRB 051008
  88. GRB 051008, optical observations
  89. GRB 051006: P60 Observations
  90. GRB 051006: XRT refined analysis
  91. GRB051006: Refined analysis of the Swift-BAT burst
  92. GRB 051006: XRT position
  93. GRB051006: Swift detection of a burst
  94. GRB 051001: Swift XRT refined analysis
  95. GRB 051001: AAT infra-red observations
  96. GRB 051001: ROTSE-III Optical Limits
  97. GRB050922C: optical observation
  98. GRB050922C: UVES/VLT high resolution spectroscopy
  99. GRB050925: Swift/XRT limits
  100. GRB/SGR 050925: IR Observations

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