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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"

36229 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. GRB 050915: KAIT optical limit
  9. GRB 050915: IR Observations
  10. GRB 050915: Swift XRT refined analysis
  11. GRB 050915: Swift-BAT refined analysis
  12. GRB050915: P60 Optical Observations
  13. GRB 050915: ROTSE-III optical limits
  14. GRB 050915: Swift detection of a GRB
  15. GRB050911: Upper limit on X-ray afterglow
  16. Swift-BAT trigger 155072 ground analysis
  17. Swift-BAT trigger 155072 is probably not a GRB
  18. GRB 050911: LCO limits on a variable source
  19. GRB 050908: DEIMOS spectrum and further analysis
  20. Swift is in normal operation
  21. GRB 050911, optical content of Swift/XRT error box
  22. GRB 050911: LCO observations
  23. GRB 050911, optical observations
  24. GRB 050911: Swift-BAT refined analysis
  25. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  26. GRB 050911: z~0.16 cluster in the field
  27. GRB 050910a: TAROT early optical limits
  28. RBO GRB 050908 observations
  29. WIRO observations in I of GRB 050908
  30. GRB 050906: Possible X-ray Counterpart
  31. GRB 050906: RTT150 optical observations
  32. GRB050908: VLT R-band decay index.
  33. GRB 050908: Swift-BAT refined analysis
  34. GRB 050908: Optical observations
  35. Gemini Spectroscopy of GRB 050908
  36. GRB 050908: spectroscopic redshift
  37. GRB 050908: Prompt PROMPT Observations
  38. GRB 050908 : Swift XRT position
  39. GRB 050908: KAIT observations
  40. GRB 050908: P60 Confirmation of Optical Afterglow
  41. GRB 050908: Optical Observations
  42. GRB 050908: Swift detection of a burst
  43. Swift trigger 154073 is not a GRB
  44. GRB 050906: Optical observations at the Very Large Telescope
  45. GRB050904: CrAO optical observations
  46. GRB 050904 BAT refined analysis of complete data set
  47. GRB 050904: Subaru Optical Spectroscopy
  48. GRB 050906: MARGE Optical Limits
  49. GRB 050906: Swift-BAT refined analysis
  50. GRB 050906: Swift XRT upper limit
  51. GRB 050906: Radio Observations
  52. GRB 050904: Keck I-band Imaging
  53. GRB 050904: more VLT NIR observations
  54. GRB 050904: BOOTES early R-band observation
  55. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  56. GRB 050906: Bright galaxy in BAT error box
  57. GRB 050906: Swift/BAT Detection of a possible burst
  58. GRB 050904: More SOAR
  59. GRB 050904: photometric redshift
  60. GRB 050904: Swift/UVOT observations
  61. GRB 050904: Afterglow Astrometry
  62. GRB 050904: NIR object inside the XRT error box
  63. GRB 050904: early Swift XRT analysis results
  64. GRB 050904: SOAR YJ and PROMPT Ic Observations
  65. GRB 050904: BAT refined analysis of partial data set
  66. GRB 050904: TAROT optical measurements
  67. GRB050904: Optical Observations
  68. GRB 050904: Environmental Constraints
  69. GRB 050904: Possible High-Redshift GRB
  70. GRB 050904: SOAR/PROMPT Observations
  71. GRB 050904: TAROT optical limits
  72. Swift-BAT triggers 153461-153465 are not GRBs
  73. GRB 050824: MDM Observations
  74. GRB 050827: Swift XRT preliminary analysis results
  75. IBAS Alerts 2641 and 2642: not a real GRB
  76. Swift Trigger #152652 is not a GRB
  77. GRB 050827 : OSN 1.5m optical observations
  78. GRB 050827: P200 NIR Observations
  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. GRB050824: First 2 hours of power low optical decay?
  91. GRB 050826: Swift XRT position
  92. GRB050826: Swift-BAT detection of a long burst
  93. GRB050824: MASTER final analysis of the OT observations
  94. Possible GRB050825:MASTER optical observations
  95. Swift-BAT trigger 152038 is definitely not a GRB
  96. Swift-BAT trigger 152038 is probably not a GRB
  97. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  98. GRB050824, I-band imaging
  99. GRB050824: Radio Observations
  100. GRB 050824: Spectroscopic redshift from the VLT

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