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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"

36214 results found.

  1. Swift-BAT trigger 155072 ground analysis
  2. Swift-BAT trigger 155072 is probably not a GRB
  3. GRB 050911: LCO limits on a variable source
  4. GRB 050908: DEIMOS spectrum and further analysis
  5. Swift is in normal operation
  6. GRB 050911, optical content of Swift/XRT error box
  7. GRB 050911: LCO observations
  8. GRB 050911, optical observations
  9. GRB 050911: Swift-BAT refined analysis
  10. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  11. GRB 050911: z~0.16 cluster in the field
  12. GRB 050910a: TAROT early optical limits
  13. RBO GRB 050908 observations
  14. WIRO observations in I of GRB 050908
  15. GRB 050906: Possible X-ray Counterpart
  16. GRB 050906: RTT150 optical observations
  17. GRB050908: VLT R-band decay index.
  18. GRB 050908: Swift-BAT refined analysis
  19. GRB 050908: Optical observations
  20. Gemini Spectroscopy of GRB 050908
  21. GRB 050908: spectroscopic redshift
  22. GRB 050908: Prompt PROMPT Observations
  23. GRB 050908 : Swift XRT position
  24. GRB 050908: KAIT observations
  25. GRB 050908: P60 Confirmation of Optical Afterglow
  26. GRB 050908: Optical Observations
  27. GRB 050908: Swift detection of a burst
  28. Swift trigger 154073 is not a GRB
  29. GRB 050906: Optical observations at the Very Large Telescope
  30. GRB050904: CrAO optical observations
  31. GRB 050904 BAT refined analysis of complete data set
  32. GRB 050904: Subaru Optical Spectroscopy
  33. GRB 050906: MARGE Optical Limits
  34. GRB 050906: Swift-BAT refined analysis
  35. GRB 050906: Swift XRT upper limit
  36. GRB 050906: Radio Observations
  37. GRB 050904: Keck I-band Imaging
  38. GRB 050904: more VLT NIR observations
  39. GRB 050904: BOOTES early R-band observation
  40. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  41. GRB 050906: Bright galaxy in BAT error box
  42. GRB 050906: Swift/BAT Detection of a possible burst
  43. GRB 050904: More SOAR
  44. GRB 050904: photometric redshift
  45. GRB 050904: Swift/UVOT observations
  46. GRB 050904: Afterglow Astrometry
  47. GRB 050904: NIR object inside the XRT error box
  48. GRB 050904: early Swift XRT analysis results
  49. GRB 050904: SOAR YJ and PROMPT Ic Observations
  50. GRB 050904: BAT refined analysis of partial data set
  51. GRB 050904: TAROT optical measurements
  52. GRB050904: Optical Observations
  53. GRB 050904: Environmental Constraints
  54. GRB 050904: Possible High-Redshift GRB
  55. GRB 050904: SOAR/PROMPT Observations
  56. GRB 050904: TAROT optical limits
  57. Swift-BAT triggers 153461-153465 are not GRBs
  58. GRB 050824: MDM Observations
  59. GRB 050827: Swift XRT preliminary analysis results
  60. IBAS Alerts 2641 and 2642: not a real GRB
  61. Swift Trigger #152652 is not a GRB
  62. GRB 050827 : OSN 1.5m optical observations
  63. GRB 050827: P200 NIR Observations
  64. GRB 050827: Optical Limit
  65. GRB 050827: XRT possible afterglow detection
  66. GRB 050826 : Lulin R band observation
  67. GRB050824: Maidanak optical limits
  68. GRB050820A: RTT150 optical observations
  69. GRB050827: RTT150 optical observations
  70. GRB 050827: Swift-BAT refined analysis
  71. GRB 050826: Optical Candidate
  72. GRB050824, HETE-2 Observation
  73. GRB 050826: Swift XRT preliminary analysis results
  74. GRB 050826: BAT refined analysis
  75. GRB050824: First 2 hours of power low optical decay?
  76. GRB 050826: Swift XRT position
  77. GRB050826: Swift-BAT detection of a long burst
  78. GRB050824: MASTER final analysis of the OT observations
  79. Possible GRB050825:MASTER optical observations
  80. Swift-BAT trigger 152038 is definitely not a GRB
  81. Swift-BAT trigger 152038 is probably not a GRB
  82. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  83. GRB050824, I-band imaging
  84. GRB050824: Radio Observations
  85. GRB 050824: Spectroscopic redshift from the VLT
  86. GRB 050822: refined XRT analysis
  87. GRB 050824: XRT refined analysis and possible afterglow detection
  88. GRB 050824: BAT refined analysis of a soft weak burst
  89. GRB050824: MASTER:OT decay
  90. GRB050824: MASTER observation OT
  91. GRB050805a: MASTER optical candidat
  92. GRB 050824: ROTSE-III Optical Limits
  93. GRB050824: Swift-BAT detection of a burst
  94. GRB 050824 optical candidate
  95. GRB050820A: RTT150 optical observations
  96. GRB050820a: PROMPT RcIc Observations
  97. GRB050815: Maidanak optical observation
  98. XRF050509c: Radio upper limits from GMRT
  99. VLT/UVES spectroscopy of GRB050820
  100. GRB 050820A BAT observations of second, larger episode of emission

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