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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

36098 results found.

  1. GRB 051008: - a high redshift high-luminosity burst?
  2. GRB 051008 - a low redshift low-luminosity burst?
  3. IBAS Alert 2673: not a real GRB
  4. GRB051011: MASTER optical observation
  5. GRB051008: optical observation
  6. GRB051008: Swift XRT refined analysis
  7. GRB051008 - Swift UVOT upper limits
  8. Konus-Wind observation of GRB 051008
  9. GRB051008: Final refined analysis of the Swift-BAT burst
  10. GRB 051008: R-band upper limit
  11. GRB051008: Radio Observation
  12. GRB 051008: Swift XRT position
  13. GRB 051008, optical observations
  14. GRB 051008: early Swift XRT analysis
  15. GRB 051008: Swift UVOT Candidate
  16. GRB 051006: P60 Observations
  17. grb test
  18. GRB 051006: XRT refined analysis
  19. GRB 051006: optical observations at Sierra Nevada
  20. GRB 051006: XRT position
  21. GRB 050906, summary of radio observations
  22. GRB 050925: Second Epoch WSRT Radio Observations
  23. GRB 051001: Swift XRT refined analysis
  24. GRB 051001, optical observations at Mt. John
  25. GRB 051001: I-band limit
  26. GRB 051001: AAT infra-red observations
  27. GRB 051001: Swift-BAT refined analysis
  28. GRB 051001: Swift Detection of a Burst
  29. GRB 051001: ROTSE-III Optical Limits
  30. GRB050908: optical observations
  31. GRB050922C: optical observation
  32. GRB050922B: optical limit
  33. GRB 050922C: further VLT observations
  34. GRB 050820A: NIR photometry at the TNG
  35. GRB050922C: UVES/VLT high resolution spectroscopy
  36. GRB050925: Swift/XRT limits
  37. GRB/SGR 050925: IR Observations
  38. GRB 050922C: break in the lightcurve
  39. GRB 050925: WSRT Radio Observations
  40. GRB 050925 : I-band observation at Xinglong observatory
  41. GRB050925: Faulkes Telescope North R-band limit
  42. GRB050925: Swift-BAT detection of a short burst
  43. GRB 050922B: Correction to BAT refined analysis, longer burst
  44. GRB050922C: TNG spectroscopic observations
  45. GRB050922B: refined XRT analysis
  46. Konus-Wind observation of GRB 050922C
  47. GRB 050922C: Refined redshift
  48. GRB OT observation
  49. GRB050922C: observation at MonteBoo
  50. INT 2.5m limit for GRB050922B
  51. GRB 050922B: optical limit
  52. GRB050922C: Optical Observations
  53. GRB 050922C: Swift XRT refined analysis
  54. HETE Fregate observations of GRB 050922C
  55. GRB 050922C: Swift-BAT refined analysis
  56. GRB 050922B: Swift-BAT refined analysis
  57. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  58. GRB 050922C: optical obserations
  59. GRB 050922C: NOT optical observations
  60. GRB 050922A: Analysis of Swift/XRT TOO observation
  61. GRB 050922C: Swift detection of a bright burst
  62. GRB 050922C: ROTSE-IIId Refined Analysis
  63. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  64. GRB 050922B: ROTSE-III Optical Limits
  65. GRB 050922B,optical observation
  66. GRB050922B: Swift-BAT detection of a weak long burst
  67. Possible GRB 050922 detected by INTEGRAL
  68. GRB050820B: analysis of the XMM-Newton observation
  69. GRB050916: Swift/UVOT Upper Limits
  70. GRB 050916: Swift-BAT refined analysis
  71. GRB 050918 - A long GRB detected by INTEGRAL
  72. GRB 050915a: Radio Observations
  73. Swift-BAT trigger 155764 is not a GRB
  74. Swift-BAT trigger 155764 is probably not a GRB
  75. Swift-BAT trigger 155535 is definitely not a GRB
  76. GRB 050916: XRT position
  77. GRB 050915b, SMARTS optical/IR observations of the XRT position
  78. GRB 050915B: Swift-BAT refined analysis
  79. GRB 050915B: Swift/UVOT Upper Limits
  80. GRB 050915a: IR Transient
  81. GRB 050915B: XRT position
  82. GRB 050915b, SMARTS optical/IR observations
  83. GRB 050915: KAIT optical limit
  84. GRB 050915: IR Observations
  85. GRB 050915: Swift XRT refined analysis
  86. GRB 050915: Swift-BAT refined analysis
  87. GRB050915: P60 Optical Observations
  88. GRB 050915: ROTSE-III optical limits
  89. GRB 050915: Swift detection of a GRB
  90. GRB050911: Upper limit on X-ray afterglow
  91. Swift-BAT trigger 155072 ground analysis
  92. Swift-BAT trigger 155072 is probably not a GRB
  93. GRB 050911: LCO limits on a variable source
  94. GRB 050908: DEIMOS spectrum and further analysis
  95. Swift is in normal operation
  96. GRB 050911, optical content of Swift/XRT error box
  97. GRB 050911: LCO observations
  98. GRB 050911, optical observations
  99. GRB 050911: Swift-BAT refined analysis
  100. Later Swift-BAT triggers 154632 and 154633 RETRACTION

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