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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"

45525 results found.

  1. GRB 050915: ROTSE-III optical limits
  2. GRB 050915: Swift detection of a GRB
  3. GRB050911: Upper limit on X-ray afterglow
  4. Swift-BAT trigger 155072 ground analysis
  5. Swift-BAT trigger 155072 is probably not a GRB
  6. GRB050914: XRT position probably due to cosmic ray
  7. GRB 050911: LCO limits on a variable source
  8. GRB 050908: DEIMOS spectrum and further analysis
  9. Swift is in normal operation
  10. GRB050911: Swift UVOT followup observations
  11. GRB 050911, optical content of Swift/XRT error box
  12. GRB050911: Swift-XRT position
  13. GRB 050911: LCO observations
  14. GRB 050911, optical observations
  15. GRB 050911: Swift-BAT refined analysis
  16. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  17. GRB 050911: z~0.16 cluster in the field
  18. GRB050911: Swift-BAT detection of a long burst
  19. GRB050908: detection of Swift/UVOT optical counterpart
  20. GRB 050910a: TAROT early optical limits
  21. RBO GRB 050908 observations
  22. WIRO observations in I of GRB 050908
  23. GRB 050906: Possible X-ray Counterpart
  24. GRB 050906: RTT150 optical observations
  25. GRB050908: Swift/UVOT Early upper limits
  26. GRB050908: VLT R-band decay index.
  27. GRB050908 : Swift-XRT refined analysis
  28. GRB 050908: Swift-BAT refined analysis
  29. GRB 050908: Optical observations
  30. Gemini Spectroscopy of GRB 050908
  31. GRB 050908: spectroscopic redshift
  32. GRB 050908: Prompt PROMPT Observations
  33. GRB 050908 : Swift XRT position
  34. GRB 050908: KAIT observations
  35. GRB 050908: P60 Confirmation of Optical Afterglow
  36. GRB 050908: Optical Observations
  37. GRB 050908: Swift detection of a burst
  38. Swift trigger 154073 is not a GRB
  39. GRB 050906: Optical observations at the Very Large Telescope
  40. GRB050904: CrAO optical observations
  41. GRB 050904 BAT refined analysis of complete data set
  42. GRB 050904: Subaru Optical Spectroscopy
  43. GRB 050906: MARGE Optical Limits
  44. GRB 050906: Swift-BAT refined analysis
  45. GRB 050906: Swift XRT upper limit
  46. GRB 050906: Radio Observations
  47. GRB 050904: Keck I-band Imaging
  48. GRB050906: P60 Observations
  49. GRB 050904: more VLT NIR observations
  50. GRB 050904: BOOTES early R-band observation
  51. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  52. GRB 050906: Bright galaxy in BAT error box
  53. GRB 050906: Swift/BAT Detection of a possible burst
  54. GRB 050904: More SOAR
  55. GRB 050904: photometric redshift
  56. GRB 050904: Swift/UVOT observations
  57. GRB 050904: Afterglow Astrometry
  58. GRB 050904: NIR object inside the XRT error box
  59. GRB 050904: early Swift XRT analysis results
  60. GRB 050904: SOAR YJ and PROMPT Ic Observations
  61. GRB 050904: BAT refined analysis of partial data set
  62. GRB 050904: TAROT optical measurements
  63. GRB050904: Optical Observations
  64. GRB 050904: Environmental Constraints
  65. GRB 050904: Possible High-Redshift GRB
  66. GRB 050904: SOAR/PROMPT Observations
  67. GRB050904: P60 Observations
  68. GRB 050904: TAROT optical limits
  69. GRB050904: Swift-BAT detection of a probable burst
  70. Swift-BAT triggers 153461-153465 are not GRBs
  71. Retraction of Swift-BAT trigger #153355
  72. GRB 050824: MDM Observations
  73. GRB 050827: Swift XRT preliminary analysis results
  74. IBAS Alerts 2641 and 2642: not a real GRB
  75. Swift Trigger #152652 is not a GRB
  76. GRB 050827 : OSN 1.5m optical observations
  77. GRB 050827: P200 NIR Observations
  78. GRB050827: Swift/UVOT upper limits
  79. GRB 050827: Optical Limit
  80. GRB 050827: XRT possible afterglow detection
  81. GRB 050826 : Lulin R band observation
  82. GRB050824: Maidanak optical limits
  83. GRB050820A: RTT150 optical observations
  84. GRB050827: RTT150 optical observations
  85. GRB 050827: Swift-BAT refined analysis
  86. GRB050827: Swift-BAT detection of a burst
  87. Subaru Observations of GRB050724
  88. GRB 050826: Optical Candidate
  89. GRB050824, HETE-2 Observation
  90. GRB 050826: Swift XRT preliminary analysis results
  91. GRB 050826: BAT refined analysis
  92. GRB050826: Swift/UVOT early upper limits
  93. GRB050824: First 2 hours of power low optical decay?
  94. GRB 050826: Swift XRT position
  95. GRB050826: Swift-BAT detection of a long burst
  96. GRB050824: MASTER final analysis of the OT observations
  97. Swift-BAT trigger 152038 is definitely not a GRB
  98. GRB050824: CORRECTION to UVOT observing times
  99. Swift-BAT trigger 152038 is probably not a GRB
  100. GRB050824: Swift/UVOT detection of fading afterglow

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