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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"

11072 results found.

  1. GRB060105: refined analysis of the Suzaku observation
  2. GRB060124 optical observations
  3. GRB 060121: Probable Detection of NIR Afterglow
  4. Konus-Wind observation of GRB 060124
  5. GRB060124: detailed XRT analysis
  6. GRB 060124: Confirmation of the Afterglow
  7. GRB 060124: Optical Observations at Tautenburg
  8. GRB 060117: Suzaku WAM observation of the prompt emission
  9. GRB 060111B: Suzaku WAM observation of the prompt emission
  10. Konus-Wind observation of GRB 060121
  11. GRB060117 - ATCA 3/6cm radio limits - correction
  12. GRB060117 - ATCA 3/6cm radio limits
  13. Konus-Wind observation of GRB 060117
  14. GRB 060116: PROMPT Observations
  15. GRB 060117: FRAM refined analysis
  16. GRB 060116: Refined analysis of the Swift-BAT burst
  17. GRB 060116: ROTSE-III Optical Limits
  18. GRB 060115: Refined analysis of the Swift-BAT burst
  19. GRB 060115: MITSuME optical afterglow candidate
  20. GRB 060115: Swift detection of a burst
  21. GRB 060114: A long GRB detected by INTEGRAL
  22. GRB 060111B: MITSuME detection of optical afterglow
  23. GRB 060110: MARGE observations
  24. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  25. GRB 060111B: Swift detection of a burst
  26. GRB 060111: TAROT optical observation
  27. GRB 060111: Swift detection of a burst
  28. GRB 060109: Swift-BAT refined analysis
  29. GRB060109, optical observation
  30. GRB060108: Swift detection of its 100th GRB
  31. Konus-Wind observation of GRB 060105
  32. GRB 060105: Mitsume optical observations
  33. GRB 060105: XRT refined analysis
  34. GRB 060102: Swift-BAT detection of a burst
  35. GRB051227: SARA Observations
  36. GRB 051227: Gemini observations
  37. GRB 051227: Magellan r'-band Imaging/Astrometry
  38. GRB 051227: refined analysis of VLT images
  39. GRB 051227: R-band object in the XRT error circle
  40. Konus-Wind observation of GRB 051221A
  41. GRB051221A: Suzaku WAM observation of the prompt emission
  42. GRB 051221A: Chandra Afterglow Position
  43. GRB 051221B: ROTSE-III Optical Limits
  44. GRB 051221A: RAPTOR Fading Counterpart Constraint
  45. GRB 051221B: BOOTES optical observations.
  46. Swift-BAT detection of a possible burst
  47. GRB 051211B: Swift XRT confirmation of the afterglow
  48. GRB 051211b: RTT150 optical observations
  49. GRB051211b: P60 Observations
  50. GRB 051211B: a long GRB detected by INTEGRAL
  51. IPN observations of SGR1806-20
  52. An extraordinary long burst on December 3 from SGR1806-20
  53. Possible resuming of the SGR 1806-20 activity
  54. GRB 051127: Swift-BAT detection of a possible burst
  55. GRB051117B: Swift XRT refined analysis
  56. GRB051111: Suzaku WAM observation of the prompt emission
  57. GRB051111: Rc optical observations
  58. GRB051008: Suzaku WAM observation of the prompt emission
  59. GRB 051021 Optical Observations
  60. GRB 051117B: ROTSE-III Optical Limits
  61. GRB 051117: Swift detection of a bright burst
  62. GRB050925: analysis of the XMM-Newton observation
  63. GRB 051111: Further spectroscopic analysis
  64. GRB/SGR 050925: XMM-Newton ToO observation
  65. GRB051111: Swift/UVOT Observations
  66. GRB 051111A: KAIT optical observations
  67. GRB051111: Swift-BAT detection of a bright burst
  68. GRB 051109b: GETS observation
  69. Early RAPTOR measurements of GRB 051109a - the movie.
  70. Konus-Wind observation of GRB 051109A
  71. GRB 051109B: ROTSE-III Optical Limits
  72. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  73. GRB051105B: REM Optical observation
  74. GRB 051109B: Swift detection of a burst
  75. GRB 051109: Swift-BAT refined analysis
  76. GRB051109: Swift detection of a burst
  77. GRB 051105a: MDM Observations
  78. GRB 051105A: TNG optical observations
  79. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  80. GRB051105B - A long GRB detected by INTEGRAL
  81. Konus-Wind observation of GRB 051028
  82. GRB051028:MASTER correction and final results
  83. GRB 051022: RTT150 optical observations
  84. GRB051028: Swift/UVOT upper limits
  85. GRB051028: Swift XRT Position
  86. GRB051022: Swift XRT measurement of jet break
  87. SGR 1806-20: continued moderate activity seen with INTEGRAL
  88. Chandra Observations of GRB 051022
  89. GRB 051022 Chandra Observations scheduled
  90. Konus-Wind observation of GRB 051022
  91. GRB 051022 (=H3950): SXC Flight Localization is Valid
  92. GRB 051021B: Refined analysis of the Swift-BAT burst
  93. GRB 051022A: ROTSE-III Optical Limits
  94. GRB 050502b: Optical limit
  95. GRB 051016B: refined analysis of the Swift/XRT data
  96. GRB 051016: LCO optical and near-IR imaging
  97. GRB050805A: Rc optical observations
  98. GRB 051008 - a low redshift low-luminosity burst?
  99. Konus-Wind observation of GRB 051008
  100. GRB 051008, optical observations

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