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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"

42884 results found.

  1. GRB 050911: LCO limits on a variable source
  2. GRB 050908: DEIMOS spectrum and further analysis
  3. Swift is in normal operation
  4. GRB050911: Swift UVOT followup observations
  5. GRB 050911, optical content of Swift/XRT error box
  6. GRB050911: Swift-XRT position
  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. GRB050911: Swift-BAT detection of a long burst
  13. GRB050908: detection of Swift/UVOT optical counterpart
  14. GRB 050910a: TAROT early optical limits
  15. RBO GRB 050908 observations
  16. WIRO observations in I of GRB 050908
  17. GRB 050906: Possible X-ray Counterpart
  18. GRB 050906: RTT150 optical observations
  19. GRB050908: Swift/UVOT Early upper limits
  20. GRB050908: VLT R-band decay index.
  21. GRB050908 : Swift-XRT refined analysis
  22. GRB 050908: Swift-BAT refined analysis
  23. GRB 050908: Optical observations
  24. Gemini Spectroscopy of GRB 050908
  25. GRB 050908: spectroscopic redshift
  26. GRB 050908: Prompt PROMPT Observations
  27. GRB 050908 : Swift XRT position
  28. GRB 050908: KAIT observations
  29. GRB 050908: P60 Confirmation of Optical Afterglow
  30. GRB 050908: Optical Observations
  31. GRB 050908: Swift detection of a burst
  32. Swift trigger 154073 is not a GRB
  33. GRB 050906: Optical observations at the Very Large Telescope
  34. GRB 050904 BAT refined analysis of complete data set
  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: BOOTES early R-band observation
  43. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  44. GRB 050906: Bright galaxy in BAT error box
  45. GRB 050906: Swift/BAT Detection of a possible burst
  46. GRB 050904: More SOAR
  47. GRB 050904: photometric redshift
  48. GRB 050904: Swift/UVOT observations
  49. GRB 050904: Afterglow Astrometry
  50. GRB 050904: NIR object inside the XRT error box
  51. GRB 050904: early Swift XRT analysis results
  52. GRB 050904: SOAR YJ and PROMPT Ic Observations
  53. GRB 050904: BAT refined analysis of partial data set
  54. GRB 050904: TAROT optical measurements
  55. GRB050904: Optical Observations
  56. GRB 050904: Environmental Constraints
  57. GRB 050904: Possible High-Redshift GRB
  58. GRB 050904: SOAR/PROMPT Observations
  59. GRB050904: P60 Observations
  60. GRB 050904: TAROT optical limits
  61. GRB050904: Swift-BAT detection of a probable burst
  62. Swift-BAT triggers 153461-153465 are not GRBs
  63. Retraction of Swift-BAT trigger #153355
  64. GRB 050824: MDM Observations
  65. GRB 050827: Swift XRT preliminary analysis results
  66. IBAS Alerts 2641 and 2642: not a real GRB
  67. Swift Trigger #152652 is not a GRB
  68. GRB 050827 : OSN 1.5m optical observations
  69. GRB 050827: P200 NIR Observations
  70. GRB050827: Swift/UVOT upper limits
  71. GRB 050827: Optical Limit
  72. GRB 050827: XRT possible afterglow detection
  73. GRB050824: Maidanak optical limits
  74. GRB050820A: RTT150 optical observations
  75. GRB050827: RTT150 optical observations
  76. GRB 050827: Swift-BAT refined analysis
  77. GRB050827: Swift-BAT detection of a burst
  78. Subaru Observations of GRB050724
  79. GRB 050826: Optical Candidate
  80. GRB050824, HETE-2 Observation
  81. GRB 050826: Swift XRT preliminary analysis results
  82. GRB 050826: BAT refined analysis
  83. GRB050826: Swift/UVOT early upper limits
  84. GRB 050826: Swift XRT position
  85. GRB050826: Swift-BAT detection of a long burst
  86. Possible GRB050825:MASTER optical observations
  87. Swift-BAT trigger 152038 is definitely not a GRB
  88. GRB050824: CORRECTION to UVOT observing times
  89. Swift-BAT trigger 152038 is probably not a GRB
  90. GRB050824: Swift/UVOT detection of fading afterglow
  91. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  92. GRB050824, I-band imaging
  93. GRB050824: Radio Observations
  94. GRB 050824: Spectroscopic redshift from the VLT
  95. GRB 050822: refined XRT analysis
  96. GRB 050824: XRT refined analysis and possible afterglow detection
  97. GRB 050824: BAT refined analysis of a soft weak burst
  98. GRB050824: MASTER:OT decay
  99. GRB050824: Swift-BAT detection of a burst
  100. GRB 050824 optical candidate

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