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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"

32697 results found.

  1. GRB 051016: LCO optical and near-IR imaging
  2. GRB 051016: PROMPT Observations
  3. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  4. GRB051006: optical observations
  5. Swift trigger 159578 is not a burst
  6. GRB050805A: Rc optical observations
  7. GRB 051006: Swift/UVOT Upper Limits
  8. GRB051008: optical candidate
  9. GRB 051008 - a low redshift low-luminosity burst?
  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: Refined analysis of the Swift-BAT burst
  16. GRB051008: Radio Observation
  17. GRB 051008: Swift XRT position
  18. GRB 051008, optical observations
  19. GRB 051006: P60 Observations
  20. GRB 051006: XRT refined analysis
  21. GRB051006: Refined analysis of the Swift-BAT burst
  22. GRB 051006: XRT position
  23. GRB 050906, summary of radio observations
  24. Swift-BAT triggers 158261 and 158262 Retraction
  25. GRB051001: Swift UVOT Upper Limits
  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: ROTSE-III Optical Limits
  33. GRB050908: optical observations
  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. GRB050922C - Swift UVOT preliminary analysis
  41. GRB 050922C: break in the lightcurve
  42. GRB 050925: WSRT Radio Observations
  43. GRB050925: Swift UVOT upper limits
  44. Refined analysis of the Swift-BAT soft short burst
  45. GRB 050925 : I-band observation at Xinglong observatory
  46. GRB 050922B: Correction to BAT refined analysis, longer burst
  47. GRB050922C: TNG spectroscopic observations
  48. GRB050922B: refined XRT analysis
  49. Konus-Wind observation of GRB 050922C
  50. GRB 050922C: Refined redshift
  51. GRB050922B: Swift UVOT early upper limits.
  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. GRB050922C: optical observations
  62. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  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. GRB050918: Possible Swift/XRT detected afterglow
  70. GRB050916: Swift/UVOT Upper Limits
  71. GRB 050916: Swift-BAT refined analysis
  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. GRB050916 : Swift-XRT refined analysis
  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. GRB050915: Swift/UVOT upper limits
  84. GRB 050915: KAIT optical limit
  85. GRB 050915: IR Observations
  86. GRB 050915: Swift XRT refined analysis
  87. GRB 050915: Swift-BAT refined analysis
  88. GRB050915: P60 Optical Observations
  89. GRB050915, optical observations
  90. GRB050915: XRT position
  91. GRB 050915: ROTSE-III optical limits
  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. GRB050911: Swift UVOT followup observations
  99. GRB050911: Swift-XRT position
  100. GRB 050911: LCO observations

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