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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"

32722 results found.

  1. GRB 050916: XRT position
  2. GRB 050915b, SMARTS optical/IR observations of the XRT position
  3. GRB 050915B: Swift-BAT refined analysis
  4. GRB 050915B: Swift/UVOT Upper Limits
  5. GRB 050915a: IR Transient
  6. GRB 050915B: XRT position
  7. GRB 050915b, SMARTS optical/IR observations
  8. GRB050915: Swift/UVOT upper limits
  9. GRB 050915: KAIT optical limit
  10. GRB 050915: IR Observations
  11. GRB 050915: Swift XRT refined analysis
  12. GRB 050915: Swift-BAT refined analysis
  13. GRB050915: P60 Optical Observations
  14. GRB050915, optical observations
  15. GRB050915: XRT position
  16. GRB 050915: ROTSE-III optical limits
  17. GRB050911: Upper limit on X-ray afterglow
  18. Swift-BAT trigger 155072 ground analysis
  19. Swift-BAT trigger 155072 is probably not a GRB
  20. GRB 050911: LCO limits on a variable source
  21. GRB 050908: DEIMOS spectrum and further analysis
  22. Swift is in normal operation
  23. GRB050911: Swift UVOT followup observations
  24. GRB050911: Swift-XRT position
  25. GRB 050911: LCO observations
  26. GRB 050911, optical observations
  27. GRB 050911: Swift-BAT refined analysis
  28. GRB 050911: z~0.16 cluster in the field
  29. GRB050908: detection of Swift/UVOT optical counterpart
  30. GRB 050910a: TAROT early optical limits
  31. RBO GRB 050908 observations
  32. WIRO observations in I of GRB 050908
  33. GRB 050906: Possible X-ray Counterpart
  34. GRB 050906: RTT150 optical observations
  35. GRB050908: Swift/UVOT Early upper limits
  36. GRB050908: VLT R-band decay index.
  37. GRB 050908: Swift-BAT refined analysis
  38. GRB 050908: Optical observations
  39. Gemini Spectroscopy of GRB 050908
  40. GRB 050908: spectroscopic redshift
  41. GRB 050908: Prompt PROMPT Observations
  42. GRB 050908 : Swift XRT position
  43. GRB 050908: KAIT observations
  44. GRB 050908: P60 Confirmation of Optical Afterglow
  45. GRB 050908: Optical Observations
  46. GRB 050906: Optical observations at the Very Large Telescope
  47. GRB050904: CrAO optical observations
  48. GRB 050904 BAT refined analysis of complete data set
  49. GRB 050904: Subaru Optical Spectroscopy
  50. GRB 050906: MARGE Optical Limits
  51. GRB 050906: Swift-BAT refined analysis
  52. GRB 050906: Swift XRT upper limit
  53. GRB 050906: Radio Observations
  54. GRB 050904: Keck I-band Imaging
  55. GRB050906: P60 Observations
  56. GRB 050904: more VLT NIR observations
  57. GRB 050904: BOOTES early R-band observation
  58. GRB 050906: Bright galaxy in BAT error box
  59. GRB 050906: Swift/BAT Detection of a possible burst
  60. GRB 050904: More SOAR
  61. GRB 050904: photometric redshift
  62. GRB 050904: Swift/UVOT observations
  63. GRB 050904: Afterglow Astrometry
  64. GRB 050904: NIR object inside the XRT error box
  65. GRB 050904: early Swift XRT analysis results
  66. GRB 050904: SOAR YJ and PROMPT Ic Observations
  67. GRB 050904: BAT refined analysis of partial data set
  68. GRB050904: Optical Observations
  69. GRB 050904: Environmental Constraints
  70. GRB 050904: Possible High-Redshift GRB
  71. GRB 050904: SOAR/PROMPT Observations
  72. GRB050904: P60 Observations
  73. GRB 050904: TAROT optical limits
  74. GRB 050824: MDM Observations
  75. GRB 050827: Swift XRT preliminary analysis results
  76. GRB 050827 : OSN 1.5m optical observations
  77. GRB 050827: P200 NIR Observations
  78. GRB050827: Swift/UVOT upper limits
  79. GRB 050827: Optical Limit
  80. GRB 050827: XRT possible afterglow detection
  81. GRB 050826 : Lulin R band observation
  82. GRB050824: Maidanak optical limits
  83. GRB050820A: RTT150 optical observations
  84. GRB050827: RTT150 optical observations
  85. GRB 050827: Swift-BAT refined analysis
  86. GRB 050826: Optical Candidate
  87. GRB050824, HETE-2 Observation
  88. GRB 050826: Swift XRT preliminary analysis results
  89. GRB 050826: BAT refined analysis
  90. GRB050826: Swift/UVOT early upper limits
  91. GRB050824: First 2 hours of power low optical decay?
  92. GRB 050826: Swift XRT position
  93. GRB050824: MASTER final analysis of the OT observations
  94. GRB050824: CORRECTION to UVOT observing times
  95. GRB050824: Swift/UVOT detection of fading afterglow
  96. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  97. GRB050824: Radio Observations
  98. GRB 050824: Spectroscopic redshift from the VLT
  99. GRB 050822: refined XRT analysis
  100. GRB 050824: BAT refined analysis of a soft weak burst

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