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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"

32721 results found.

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

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