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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"

28116 results found.

  1. Swift-BAT trigger 155764 is not a GRB
  2. Swift-BAT trigger 155764 is probably not a GRB
  3. Swift trigger 155764: bad XRT centroid
  4. Swift-BAT trigger 155535 is definitely not a GRB
  5. GRB050916 : Swift-XRT refined analysis
  6. GRB 050915B: Swift-BAT refined analysis
  7. GRB 050915B: Swift/UVOT Upper Limits
  8. GRB 050915a: IR Transient
  9. GRB 050915b, SMARTS optical/IR observations
  10. GRB050915B: Swift-BAT detection of a long bright burst
  11. GRB050915: Swift/UVOT upper limits
  12. GRB 050915: IR Observations
  13. GRB 050915: Swift XRT refined analysis
  14. GRB 050915: Swift-BAT refined analysis
  15. GRB 050915: Swift detection of a GRB
  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 050908: DEIMOS spectrum and further analysis
  20. GRB 050911, optical content of Swift/XRT error box
  21. GRB 050911: Swift-BAT refined analysis
  22. GRB 050911: z~0.16 cluster in the field
  23. GRB050911: Swift-BAT detection of a long burst
  24. GRB 050910a: TAROT early optical limits
  25. WIRO observations in I of GRB 050908
  26. GRB 050906: Possible X-ray Counterpart
  27. GRB050908: Swift/UVOT Early upper limits
  28. GRB050908 : Swift-XRT refined analysis
  29. GRB 050908: Swift-BAT refined analysis
  30. GRB 050908: Optical observations
  31. GRB 050908: Optical Observations
  32. GRB 050908: Swift detection of a burst
  33. GRB 050906: Optical observations at the Very Large Telescope
  34. GRB 050904 BAT refined analysis of complete data set
  35. GRB 050904: Subaru Optical Spectroscopy
  36. GRB 050906: MARGE Optical Limits
  37. GRB 050906: Swift-BAT refined analysis
  38. GRB 050906: Swift XRT upper limit
  39. GRB 050906: Radio Observations
  40. GRB 050904: Keck I-band Imaging
  41. GRB050906: P60 Observations
  42. GRB 050904: more VLT NIR observations
  43. GRB 050904: photometric redshift
  44. GRB 050904: Swift/UVOT observations
  45. GRB 050904: NIR object inside the XRT error box
  46. GRB 050904: early Swift XRT analysis results
  47. GRB 050904: SOAR YJ and PROMPT Ic Observations
  48. GRB050904: Optical Observations
  49. GRB050904: P60 Observations
  50. GRB 050904: TAROT optical limits
  51. GRB 050827 : OSN 1.5m optical observations
  52. GRB 050827: P200 NIR Observations
  53. GRB050827: Swift/UVOT upper limits
  54. GRB 050827: Optical Limit
  55. GRB 050827: XRT possible afterglow detection
  56. GRB 050826 : Lulin R band observation
  57. GRB050824: Maidanak optical limits
  58. GRB 050827: Swift-BAT refined analysis
  59. Subaru Observations of GRB050724
  60. GRB 050826: Optical Candidate
  61. GRB 050826: Swift XRT preliminary analysis results
  62. GRB 050826: BAT refined analysis
  63. GRB050826: Swift/UVOT early upper limits
  64. GRB050826: Swift-BAT detection of a long burst
  65. GRB050824: MASTER final analysis of the OT observations
  66. Swift-BAT trigger 152038 is probably not a GRB
  67. GRB 050824: XRT refined analysis and possible afterglow detection
  68. GRB 050824: BAT refined analysis of a soft weak burst
  69. GRB050824: MASTER:OT decay
  70. GRB050824: MASTER observation OT
  71. GRB050805a: MASTER optical candidat
  72. XRF050509c: Radio upper limits from GMRT
  73. GRB050822: Swift/UVOT upper limits
  74. GRB 050820A BAT observations of second, larger episode of emission
  75. GRB050813: Maidanak I-band observations
  76. GRB 050822: Swift-BAT refined analysis
  77. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  78. GRB050820B at FRAM
  79. Swift/UVOT UV Photometry of GRB 050820B
  80. GRB 050822: Swift detection of a long burst
  81. GRB050820a BVRcIc field photometry
  82. GRB050820B XMM-Newton observation
  83. GRB 050820a: NIR Observations by WIRO
  84. GRB 050820B: Swift XRT position
  85. GRB050820B: Refined analysis of the Swift-BAT burst
  86. GRB050820: refined XRT analysis
  87. GRB 050820 Swift-BAT refined analysis
  88. GRB050819: refined XRT analysis
  89. GRB 050820: Swift detection of a GRB
  90. GRB 050819 Swift-BAT refined analysis
  91. GRB050819: Swift-BAT detection of a weak burst
  92. GRB 050817: Optical observations
  93. GRB050817: Negative Optical Observations
  94. GRB 050814: continued fading
  95. GRB050815: Optical afterglow detection by Swift UVOT
  96. GRB050815: XRT refined analysis
  97. GRB050815: Refined analysis of the Swift-BAT burst
  98. GRB 050815: ROTSE-III Optical Limits
  99. GRB050815: Swift-BAT detection of a burst
  100. GRB050814: Fading red source

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