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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"

36215 results found.

  1. GRB050911: Upper limit on X-ray afterglow
  2. Swift-BAT trigger 155072 ground analysis
  3. Swift-BAT trigger 155072 is probably not a GRB
  4. GRB 050911: LCO limits on a variable source
  5. GRB 050908: DEIMOS spectrum and further analysis
  6. Swift is in normal operation
  7. GRB 050911, optical content of Swift/XRT error box
  8. GRB 050911: LCO observations
  9. GRB 050911, optical observations
  10. GRB 050911: Swift-BAT refined analysis
  11. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  12. GRB 050911: z~0.16 cluster in the field
  13. GRB 050910a: TAROT early optical limits
  14. RBO GRB 050908 observations
  15. WIRO observations in I of GRB 050908
  16. GRB 050906: Possible X-ray Counterpart
  17. GRB 050906: RTT150 optical observations
  18. GRB050908: VLT R-band decay index.
  19. GRB 050908: Swift-BAT refined analysis
  20. GRB 050908: Optical observations
  21. Gemini Spectroscopy of GRB 050908
  22. GRB 050908: spectroscopic redshift
  23. GRB 050908: Prompt PROMPT Observations
  24. GRB 050908 : Swift XRT position
  25. GRB 050908: KAIT observations
  26. GRB 050908: P60 Confirmation of Optical Afterglow
  27. GRB 050908: Optical Observations
  28. GRB 050908: Swift detection of a burst
  29. Swift trigger 154073 is not a GRB
  30. GRB 050906: Optical observations at the Very Large Telescope
  31. GRB050904: CrAO optical observations
  32. GRB 050904 BAT refined analysis of complete data set
  33. GRB 050904: Subaru Optical Spectroscopy
  34. GRB 050906: MARGE Optical Limits
  35. GRB 050906: Swift-BAT refined analysis
  36. GRB 050906: Swift XRT upper limit
  37. GRB 050906: Radio Observations
  38. GRB 050904: Keck I-band Imaging
  39. GRB 050904: more VLT NIR observations
  40. GRB 050904: BOOTES early R-band observation
  41. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  42. GRB 050906: Bright galaxy in BAT error box
  43. GRB 050906: Swift/BAT Detection of a possible burst
  44. GRB 050904: More SOAR
  45. GRB 050904: photometric redshift
  46. GRB 050904: Swift/UVOT observations
  47. GRB 050904: Afterglow Astrometry
  48. GRB 050904: NIR object inside the XRT error box
  49. GRB 050904: early Swift XRT analysis results
  50. GRB 050904: SOAR YJ and PROMPT Ic Observations
  51. GRB 050904: BAT refined analysis of partial data set
  52. GRB 050904: TAROT optical measurements
  53. GRB050904: Optical Observations
  54. GRB 050904: Environmental Constraints
  55. GRB 050904: Possible High-Redshift GRB
  56. GRB 050904: SOAR/PROMPT Observations
  57. GRB 050904: TAROT optical limits
  58. Swift-BAT triggers 153461-153465 are not GRBs
  59. GRB 050824: MDM Observations
  60. GRB 050827: Swift XRT preliminary analysis results
  61. IBAS Alerts 2641 and 2642: not a real GRB
  62. Swift Trigger #152652 is not a GRB
  63. GRB 050827 : OSN 1.5m optical observations
  64. GRB 050827: P200 NIR Observations
  65. GRB 050827: Optical Limit
  66. GRB 050827: XRT possible afterglow detection
  67. GRB 050826 : Lulin R band observation
  68. GRB050824: Maidanak optical limits
  69. GRB050820A: RTT150 optical observations
  70. GRB050827: RTT150 optical observations
  71. GRB 050827: Swift-BAT refined analysis
  72. GRB 050826: Optical Candidate
  73. GRB050824, HETE-2 Observation
  74. GRB 050826: Swift XRT preliminary analysis results
  75. GRB 050826: BAT refined analysis
  76. GRB050824: First 2 hours of power low optical decay?
  77. GRB 050826: Swift XRT position
  78. GRB050826: Swift-BAT detection of a long burst
  79. GRB050824: MASTER final analysis of the OT observations
  80. Possible GRB050825:MASTER optical observations
  81. Swift-BAT trigger 152038 is definitely not a GRB
  82. Swift-BAT trigger 152038 is probably not a GRB
  83. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  84. GRB050824, I-band imaging
  85. GRB050824: Radio Observations
  86. GRB 050824: Spectroscopic redshift from the VLT
  87. GRB 050822: refined XRT analysis
  88. GRB 050824: XRT refined analysis and possible afterglow detection
  89. GRB 050824: BAT refined analysis of a soft weak burst
  90. GRB050824: MASTER:OT decay
  91. GRB050824: MASTER observation OT
  92. GRB050805a: MASTER optical candidat
  93. GRB 050824: ROTSE-III Optical Limits
  94. GRB050824: Swift-BAT detection of a burst
  95. GRB 050824 optical candidate
  96. GRB050820A: RTT150 optical observations
  97. GRB050820a: PROMPT RcIc Observations
  98. GRB050815: Maidanak optical observation
  99. XRF050509c: Radio upper limits from GMRT
  100. VLT/UVES spectroscopy of GRB050820

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