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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"

11402 results found.

  1. GRB 060116: ROTSE-III Optical Limits
  2. GRB 060115: Refined analysis of the Swift-BAT burst
  3. GRB 060115: MITSuME optical afterglow candidate
  4. GRB 060115: Swift detection of a burst
  5. GRB 060114: A long GRB detected by INTEGRAL
  6. GRB 060111B: MITSuME detection of optical afterglow
  7. GRB 060110: MARGE observations
  8. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  9. GRB 060111B: Swift detection of a burst
  10. GRB 060111: TAROT optical observation
  11. GRB 060111: Swift detection of a burst
  12. GRB 060109: Swift-BAT refined analysis
  13. GRB060109, optical observation
  14. GRB060108: Swift detection of its 100th GRB
  15. Konus-Wind observation of GRB 060105
  16. GRB 060105: Mitsume optical observations
  17. GRB 060105: XRT refined analysis
  18. GRB 060102: Swift-BAT detection of a burst
  19. GRB051227: SARA Observations
  20. GRB 051227: Gemini observations
  21. GRB 051227: Magellan r'-band Imaging/Astrometry
  22. GRB 051227: refined analysis of VLT images
  23. GRB 051227: R-band object in the XRT error circle
  24. Konus-Wind observation of GRB 051221A
  25. GRB051221A: Suzaku WAM observation of the prompt emission
  26. GRB 051221A: Chandra Afterglow Position
  27. GRB 051221B: ROTSE-III Optical Limits
  28. GRB 051221A: RAPTOR Fading Counterpart Constraint
  29. GRB 051221B: BOOTES optical observations.
  30. Swift-BAT detection of a possible burst
  31. GRB 051211B: Swift XRT confirmation of the afterglow
  32. GRB 051211b: RTT150 optical observations
  33. GRB051211b: P60 Observations
  34. GRB 051211B: a long GRB detected by INTEGRAL
  35. IPN observations of SGR1806-20
  36. An extraordinary long burst on December 3 from SGR1806-20
  37. Possible resuming of the SGR 1806-20 activity
  38. GRB 051127: Swift-BAT detection of a possible burst
  39. GRB051117B: Swift XRT refined analysis
  40. GRB051111: Suzaku WAM observation of the prompt emission
  41. GRB051111: Rc optical observations
  42. GRB051008: Suzaku WAM observation of the prompt emission
  43. GRB 051021 Optical Observations
  44. GRB 051117B: ROTSE-III Optical Limits
  45. GRB 051117: Swift detection of a bright burst
  46. GRB050925: analysis of the XMM-Newton observation
  47. GRB 051111: Further spectroscopic analysis
  48. GRB/SGR 050925: XMM-Newton ToO observation
  49. GRB051111: Swift/UVOT Observations
  50. GRB 051111A: KAIT optical observations
  51. GRB051111: Swift-BAT detection of a bright burst
  52. GRB 051109b: GETS observation
  53. Early RAPTOR measurements of GRB 051109a - the movie.
  54. Konus-Wind observation of GRB 051109A
  55. GRB 051109B: ROTSE-III Optical Limits
  56. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  57. GRB051105B: REM Optical observation
  58. GRB 051109B: Swift detection of a burst
  59. GRB 051109: Swift-BAT refined analysis
  60. GRB051109: Swift detection of a burst
  61. GRB051103: MASTER: OT limit and host galaxy candidates
  62. GRB 051105a: MDM Observations
  63. GRB 051105A: TNG optical observations
  64. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  65. GRB051105B - A long GRB detected by INTEGRAL
  66. Konus-Wind observation of GRB 051028
  67. GRB051028:MASTER correction and final results
  68. GRB 051022: RTT150 optical observations
  69. GRB051028: Swift/UVOT upper limits
  70. GRB051028: Swift XRT Position
  71. GRB051022: Swift XRT measurement of jet break
  72. SGR 1806-20: continued moderate activity seen with INTEGRAL
  73. Chandra Observations of GRB 051022
  74. GRB 051022 Chandra Observations scheduled
  75. Konus-Wind observation of GRB 051022
  76. GRB 051022 (=H3950): SXC Flight Localization is Valid
  77. GRB 051021B: Refined analysis of the Swift-BAT burst
  78. GRB 051022A: ROTSE-III Optical Limits
  79. GRB 050502b: Optical limit
  80. GRB 051016B: refined analysis of the Swift/XRT data
  81. GRB 051016: LCO optical and near-IR imaging
  82. GRB050805A: Rc optical observations
  83. GRB 051008 - a low redshift low-luminosity burst?
  84. Konus-Wind observation of GRB 051008
  85. GRB 051008, optical observations
  86. GRB 051006: P60 Observations
  87. GRB 051006: XRT refined analysis
  88. GRB051006: Refined analysis of the Swift-BAT burst
  89. GRB 051006: XRT position
  90. GRB051006: Swift detection of a burst
  91. GRB 051001: Swift XRT refined analysis
  92. GRB 051001: AAT infra-red observations
  93. GRB 051001: ROTSE-III Optical Limits
  94. GRB050922C: optical observation
  95. GRB050922C: UVES/VLT high resolution spectroscopy
  96. GRB050925: Swift/XRT limits
  97. GRB/SGR 050925: IR Observations
  98. GRB050925: Swift-BAT detection of a short burst
  99. GRB 050922B: Correction to BAT refined analysis, longer burst
  100. Konus-Wind observation of GRB 050922C

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