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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"

28115 results found.

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

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