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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"

32717 results found.

  1. GRB 050915B: XRT position
  2. GRB 050915b, SMARTS optical/IR observations
  3. GRB050915: Swift/UVOT upper limits
  4. GRB 050915: KAIT optical limit
  5. GRB 050915: IR Observations
  6. GRB 050915: Swift XRT refined analysis
  7. GRB 050915: Swift-BAT refined analysis
  8. GRB050915: P60 Optical Observations
  9. GRB050915, optical observations
  10. GRB050915: XRT position
  11. GRB 050915: ROTSE-III optical limits
  12. GRB050911: Upper limit on X-ray afterglow
  13. Swift-BAT trigger 155072 ground analysis
  14. Swift-BAT trigger 155072 is probably not a GRB
  15. GRB 050911: LCO limits on a variable source
  16. GRB 050908: DEIMOS spectrum and further analysis
  17. Swift is in normal operation
  18. GRB050911: Swift UVOT followup observations
  19. GRB050911: Swift-XRT position
  20. GRB 050911: LCO observations
  21. GRB 050911, optical observations
  22. GRB 050911: Swift-BAT refined analysis
  23. GRB 050911: z~0.16 cluster in the field
  24. GRB050908: detection of Swift/UVOT optical counterpart
  25. GRB 050910a: TAROT early optical limits
  26. RBO GRB 050908 observations
  27. WIRO observations in I of GRB 050908
  28. GRB 050906: Possible X-ray Counterpart
  29. GRB 050906: RTT150 optical observations
  30. GRB050908: Swift/UVOT Early upper limits
  31. GRB050908: VLT R-band decay index.
  32. GRB 050908: Swift-BAT refined analysis
  33. GRB 050908: Optical observations
  34. Gemini Spectroscopy of GRB 050908
  35. GRB 050908: spectroscopic redshift
  36. GRB 050908: Prompt PROMPT Observations
  37. GRB 050908 : Swift XRT position
  38. GRB 050908: KAIT observations
  39. GRB 050908: P60 Confirmation of Optical Afterglow
  40. GRB 050908: Optical Observations
  41. GRB 050906: Optical observations at the Very Large Telescope
  42. GRB050904: CrAO optical observations
  43. GRB 050904 BAT refined analysis of complete data set
  44. GRB 050904: Subaru Optical Spectroscopy
  45. GRB 050906: MARGE Optical Limits
  46. GRB 050906: Swift-BAT refined analysis
  47. GRB 050906: Swift XRT upper limit
  48. GRB 050906: Radio Observations
  49. GRB 050904: Keck I-band Imaging
  50. GRB050906: P60 Observations
  51. GRB 050904: more VLT NIR observations
  52. GRB 050904: BOOTES early R-band observation
  53. GRB 050906: Bright galaxy in BAT error box
  54. GRB 050906: Swift/BAT Detection of a possible burst
  55. GRB 050904: More SOAR
  56. GRB 050904: photometric redshift
  57. GRB 050904: Swift/UVOT observations
  58. GRB 050904: Afterglow Astrometry
  59. GRB 050904: NIR object inside the XRT error box
  60. GRB 050904: early Swift XRT analysis results
  61. GRB 050904: SOAR YJ and PROMPT Ic Observations
  62. GRB 050904: BAT refined analysis of partial data set
  63. GRB050904: Optical Observations
  64. GRB 050904: Environmental Constraints
  65. GRB 050904: Possible High-Redshift GRB
  66. GRB 050904: SOAR/PROMPT Observations
  67. GRB050904: P60 Observations
  68. GRB 050904: TAROT optical limits
  69. GRB 050824: MDM Observations
  70. GRB 050827: Swift XRT preliminary analysis results
  71. GRB 050827 : OSN 1.5m optical observations
  72. GRB 050827: P200 NIR Observations
  73. GRB050827: Swift/UVOT upper limits
  74. GRB 050827: Optical Limit
  75. GRB 050827: XRT possible afterglow detection
  76. GRB 050826 : Lulin R band observation
  77. GRB050824: Maidanak optical limits
  78. GRB050820A: RTT150 optical observations
  79. GRB050827: RTT150 optical observations
  80. GRB 050827: Swift-BAT refined analysis
  81. GRB 050826: Optical Candidate
  82. GRB050824, HETE-2 Observation
  83. GRB 050826: Swift XRT preliminary analysis results
  84. GRB 050826: BAT refined analysis
  85. GRB050826: Swift/UVOT early upper limits
  86. GRB050824: First 2 hours of power low optical decay?
  87. GRB 050826: Swift XRT position
  88. GRB050824: MASTER final analysis of the OT observations
  89. GRB050824: CORRECTION to UVOT observing times
  90. GRB050824: Swift/UVOT detection of fading afterglow
  91. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  92. GRB050824: Radio Observations
  93. GRB 050824: Spectroscopic redshift from the VLT
  94. GRB 050822: refined XRT analysis
  95. GRB 050824: BAT refined analysis of a soft weak burst
  96. GRB050824: MASTER:OT decay
  97. GRB050824: MASTER observation OT
  98. GRB050805a: MASTER optical candidat
  99. GRB 050824: ROTSE-III Optical Limits
  100. GRB050820A: RTT150 optical observations

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