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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"

37700 results found.

  1. IBAS Alert 2675 : not a GRB
  2. GRB051008: optical candidate
  3. GRB 051008: - a high redshift high-luminosity burst?
  4. GRB 051008 - a low redshift low-luminosity burst?
  5. IBAS Alert 2673: not a real GRB
  6. GRB051011: MASTER optical observation
  7. GRB051008: optical observation
  8. GRB051008: Swift XRT refined analysis
  9. GRB051008 - Swift UVOT upper limits
  10. Konus-Wind observation of GRB 051008
  11. GRB051008: Final refined analysis of the Swift-BAT burst
  12. GRB 051008: R-band upper limit
  13. GRB051008: Radio Observation
  14. GRB 051008: Swift XRT position
  15. GRB 051008, optical observations
  16. GRB 051008: early Swift XRT analysis
  17. GRB 051008: Swift UVOT Candidate
  18. GRB 051006: P60 Observations
  19. grb test
  20. GRB 051006: XRT refined analysis
  21. GRB 051006: optical observations at Sierra Nevada
  22. GRB 051006: XRT position
  23. GRB 050906, summary of radio observations
  24. GRB 050925: Second Epoch WSRT Radio Observations
  25. GRB 051001: Swift XRT refined analysis
  26. GRB 051001, optical observations at Mt. John
  27. GRB 051001: I-band limit
  28. GRB 051001: AAT infra-red observations
  29. GRB 051001: Swift-BAT refined analysis
  30. GRB 051001: Swift Detection of a Burst
  31. GRB 051001: ROTSE-III Optical Limits
  32. GRB050908: optical observations
  33. GRB050922C: optical observation
  34. GRB050922B: optical limit
  35. GRB 050922C: further VLT observations
  36. GRB 050820A: NIR photometry at the TNG
  37. GRB050922C: UVES/VLT high resolution spectroscopy
  38. GRB050925: Swift/XRT limits
  39. GRB/SGR 050925: IR Observations
  40. GRB 050922C: break in the lightcurve
  41. GRB 050925: WSRT Radio Observations
  42. GRB 050925 : I-band observation at Xinglong observatory
  43. GRB050925: Faulkes Telescope North R-band limit
  44. GRB050925: Swift-BAT detection of a short burst
  45. GRB 050922B: Correction to BAT refined analysis, longer burst
  46. GRB050922C: TNG spectroscopic observations
  47. GRB050922B: refined XRT analysis
  48. Konus-Wind observation of GRB 050922C
  49. GRB 050922C: Refined redshift
  50. GRB OT observation
  51. GRB050922C: observation at MonteBoo
  52. INT 2.5m limit for GRB050922B
  53. GRB 050922B: optical limit
  54. GRB050922C: Optical Observations
  55. GRB 050922C: Swift XRT refined analysis
  56. HETE Fregate observations of GRB 050922C
  57. GRB 050922C: Swift-BAT refined analysis
  58. GRB 050922B: Swift-BAT refined analysis
  59. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  60. GRB 050922C: optical obserations
  61. GRB 050922C: NOT optical observations
  62. GRB 050922A: Analysis of Swift/XRT TOO observation
  63. GRB 050922C: Swift detection of a bright burst
  64. GRB 050922C: ROTSE-IIId Refined Analysis
  65. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  66. GRB 050922B: ROTSE-III Optical Limits
  67. GRB 050922B,optical observation
  68. GRB050922B: Swift-BAT detection of a weak long burst
  69. Possible GRB 050922 detected by INTEGRAL
  70. GRB050820B: analysis of the XMM-Newton observation
  71. GRB050916: Swift/UVOT Upper Limits
  72. GRB 050916: Swift-BAT refined analysis
  73. GRB 050918 - A long GRB detected by INTEGRAL
  74. GRB 050915a: Radio Observations
  75. Swift-BAT trigger 155764 is not a GRB
  76. Swift-BAT trigger 155764 is probably not a GRB
  77. Swift-BAT trigger 155535 is definitely not a GRB
  78. GRB 050916: XRT position
  79. GRB 050915b, SMARTS optical/IR observations of the XRT position
  80. GRB 050915B: Swift-BAT refined analysis
  81. GRB 050915B: Swift/UVOT Upper Limits
  82. GRB 050915a: IR Transient
  83. GRB 050915B: XRT position
  84. GRB 050915b, SMARTS optical/IR observations
  85. GRB 050915: KAIT optical limit
  86. GRB 050915: IR Observations
  87. GRB 050915: Swift XRT refined analysis
  88. GRB 050915: Swift-BAT refined analysis
  89. GRB050915: P60 Optical Observations
  90. GRB 050915: ROTSE-III optical limits
  91. GRB 050915: Swift detection of a GRB
  92. GRB050911: Upper limit on X-ray afterglow
  93. Swift-BAT trigger 155072 ground analysis
  94. Swift-BAT trigger 155072 is probably not a GRB
  95. GRB 050911: LCO limits on a variable source
  96. GRB 050908: DEIMOS spectrum and further analysis
  97. Swift is in normal operation
  98. GRB 050911, optical content of Swift/XRT error box
  99. GRB 050911: LCO observations
  100. GRB 050911, optical observations

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