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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"

36308 results found.

  1. Swift trigger 159578 is not a burst
  2. GRB 051006: Swift/UVOT Upper Limits
  3. IBAS Alert 2675 : not a GRB
  4. GRB051008: optical candidate
  5. GRB 051008: - a high redshift high-luminosity burst?
  6. GRB 051008 - a low redshift low-luminosity burst?
  7. IBAS Alert 2673: not a real GRB
  8. GRB051011: MASTER optical observation
  9. GRB051008: optical observation
  10. GRB051008: Swift XRT refined analysis
  11. GRB051008 - Swift UVOT upper limits
  12. Konus-Wind observation of GRB 051008
  13. GRB051008: Final refined analysis of the Swift-BAT burst
  14. GRB 051008: R-band upper limit
  15. GRB051008: Radio Observation
  16. GRB 051008: Swift XRT position
  17. GRB 051008, optical observations
  18. GRB 051008: early Swift XRT analysis
  19. GRB 051008: Swift UVOT Candidate
  20. GRB 051006: P60 Observations
  21. grb test
  22. GRB 051006: XRT refined analysis
  23. GRB 051006: optical observations at Sierra Nevada
  24. GRB 051006: XRT position
  25. GRB 050906, summary of radio observations
  26. GRB 050925: Second Epoch WSRT Radio Observations
  27. GRB 051001: Swift XRT refined analysis
  28. GRB 051001, optical observations at Mt. John
  29. GRB 051001: I-band limit
  30. GRB 051001: AAT infra-red observations
  31. GRB 051001: Swift-BAT refined analysis
  32. GRB 051001: Swift Detection of a Burst
  33. GRB 051001: ROTSE-III Optical Limits
  34. GRB050908: optical observations
  35. GRB050922C: optical observation
  36. GRB050922B: optical limit
  37. GRB 050922C: further VLT observations
  38. GRB 050820A: NIR photometry at the TNG
  39. GRB050922C: UVES/VLT high resolution spectroscopy
  40. GRB050925: Swift/XRT limits
  41. GRB/SGR 050925: IR Observations
  42. GRB 050922C: break in the lightcurve
  43. GRB 050925: WSRT Radio Observations
  44. GRB 050925 : I-band observation at Xinglong observatory
  45. GRB050925: Faulkes Telescope North R-band limit
  46. GRB050925: Swift-BAT detection of a short burst
  47. GRB 050922B: Correction to BAT refined analysis, longer burst
  48. GRB050922C: TNG spectroscopic observations
  49. GRB050922B: refined XRT analysis
  50. Konus-Wind observation of GRB 050922C
  51. GRB 050922C: Refined redshift
  52. GRB OT observation
  53. GRB050922C: observation at MonteBoo
  54. INT 2.5m limit for GRB050922B
  55. GRB 050922B: optical limit
  56. GRB050922C: Optical Observations
  57. GRB 050922C: Swift XRT refined analysis
  58. HETE Fregate observations of GRB 050922C
  59. GRB 050922C: Swift-BAT refined analysis
  60. GRB 050922B: Swift-BAT refined analysis
  61. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  62. GRB 050922C: optical obserations
  63. GRB 050922C: NOT optical observations
  64. GRB 050922A: Analysis of Swift/XRT TOO observation
  65. GRB 050922C: Swift detection of a bright burst
  66. GRB 050922C: ROTSE-IIId Refined Analysis
  67. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  68. GRB 050922B: ROTSE-III Optical Limits
  69. GRB 050922B,optical observation
  70. GRB050922B: Swift-BAT detection of a weak long burst
  71. Possible GRB 050922 detected by INTEGRAL
  72. GRB050820B: analysis of the XMM-Newton observation
  73. GRB050916: Swift/UVOT Upper Limits
  74. GRB 050916: Swift-BAT refined analysis
  75. GRB 050918 - A long GRB detected by INTEGRAL
  76. GRB 050915a: Radio Observations
  77. Swift-BAT trigger 155764 is not a GRB
  78. Swift-BAT trigger 155764 is probably not a GRB
  79. Swift-BAT trigger 155535 is definitely not a GRB
  80. GRB 050916: XRT position
  81. GRB 050915b, SMARTS optical/IR observations of the XRT position
  82. GRB 050915B: Swift-BAT refined analysis
  83. GRB 050915B: Swift/UVOT Upper Limits
  84. GRB 050915a: IR Transient
  85. GRB 050915B: XRT position
  86. GRB 050915b, SMARTS optical/IR observations
  87. GRB 050915: KAIT optical limit
  88. GRB 050915: IR Observations
  89. GRB 050915: Swift XRT refined analysis
  90. GRB 050915: Swift-BAT refined analysis
  91. GRB050915: P60 Optical Observations
  92. GRB 050915: ROTSE-III optical limits
  93. GRB 050915: Swift detection of a GRB
  94. GRB050911: Upper limit on X-ray afterglow
  95. Swift-BAT trigger 155072 ground analysis
  96. Swift-BAT trigger 155072 is probably not a GRB
  97. GRB 050911: LCO limits on a variable source
  98. GRB 050908: DEIMOS spectrum and further analysis
  99. Swift is in normal operation
  100. GRB 050911, optical content of Swift/XRT error box

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