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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"

36208 results found.

  1. GRB 050911: LCO observations
  2. GRB 050911, optical observations
  3. GRB 050911: Swift-BAT refined analysis
  4. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  5. GRB 050911: z~0.16 cluster in the field
  6. GRB 050910a: TAROT early optical limits
  7. RBO GRB 050908 observations
  8. WIRO observations in I of GRB 050908
  9. GRB 050906: Possible X-ray Counterpart
  10. GRB 050906: RTT150 optical observations
  11. GRB050908: VLT R-band decay index.
  12. GRB 050908: Swift-BAT refined analysis
  13. GRB 050908: Optical observations
  14. Gemini Spectroscopy of GRB 050908
  15. GRB 050908: spectroscopic redshift
  16. GRB 050908: Prompt PROMPT Observations
  17. GRB 050908 : Swift XRT position
  18. GRB 050908: KAIT observations
  19. GRB 050908: P60 Confirmation of Optical Afterglow
  20. GRB 050908: Optical Observations
  21. GRB 050908: Swift detection of a burst
  22. Swift trigger 154073 is not a GRB
  23. GRB 050906: Optical observations at the Very Large Telescope
  24. GRB050904: CrAO optical observations
  25. GRB 050904 BAT refined analysis of complete data set
  26. GRB 050904: Subaru Optical Spectroscopy
  27. GRB 050906: MARGE Optical Limits
  28. GRB 050906: Swift-BAT refined analysis
  29. GRB 050906: Swift XRT upper limit
  30. GRB 050906: Radio Observations
  31. GRB 050904: Keck I-band Imaging
  32. GRB 050904: more VLT NIR observations
  33. GRB 050904: BOOTES early R-band observation
  34. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  35. GRB 050906: Bright galaxy in BAT error box
  36. GRB 050906: Swift/BAT Detection of a possible burst
  37. GRB 050904: More SOAR
  38. GRB 050904: photometric redshift
  39. GRB 050904: Swift/UVOT observations
  40. GRB 050904: Afterglow Astrometry
  41. GRB 050904: NIR object inside the XRT error box
  42. GRB 050904: early Swift XRT analysis results
  43. GRB 050904: SOAR YJ and PROMPT Ic Observations
  44. GRB 050904: BAT refined analysis of partial data set
  45. GRB 050904: TAROT optical measurements
  46. GRB050904: Optical Observations
  47. GRB 050904: Environmental Constraints
  48. GRB 050904: Possible High-Redshift GRB
  49. GRB 050904: SOAR/PROMPT Observations
  50. GRB 050904: TAROT optical limits
  51. Swift-BAT triggers 153461-153465 are not GRBs
  52. GRB 050824: MDM Observations
  53. GRB 050827: Swift XRT preliminary analysis results
  54. IBAS Alerts 2641 and 2642: not a real GRB
  55. Swift Trigger #152652 is not a GRB
  56. GRB 050827 : OSN 1.5m optical observations
  57. GRB 050827: P200 NIR Observations
  58. GRB 050827: Optical Limit
  59. GRB 050827: XRT possible afterglow detection
  60. GRB 050826 : Lulin R band observation
  61. GRB050824: Maidanak optical limits
  62. GRB050820A: RTT150 optical observations
  63. GRB050827: RTT150 optical observations
  64. GRB 050827: Swift-BAT refined analysis
  65. GRB 050826: Optical Candidate
  66. GRB050824, HETE-2 Observation
  67. GRB 050826: Swift XRT preliminary analysis results
  68. GRB 050826: BAT refined analysis
  69. GRB050824: First 2 hours of power low optical decay?
  70. GRB 050826: Swift XRT position
  71. GRB050826: Swift-BAT detection of a long burst
  72. GRB050824: MASTER final analysis of the OT observations
  73. Possible GRB050825:MASTER optical observations
  74. Swift-BAT trigger 152038 is definitely not a GRB
  75. Swift-BAT trigger 152038 is probably not a GRB
  76. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  77. GRB050824, I-band imaging
  78. GRB050824: Radio Observations
  79. GRB 050824: Spectroscopic redshift from the VLT
  80. GRB 050822: refined XRT analysis
  81. GRB 050824: XRT refined analysis and possible afterglow detection
  82. GRB 050824: BAT refined analysis of a soft weak burst
  83. GRB050824: MASTER:OT decay
  84. GRB050824: MASTER observation OT
  85. GRB050805a: MASTER optical candidat
  86. GRB 050824: ROTSE-III Optical Limits
  87. GRB050824: Swift-BAT detection of a burst
  88. GRB 050824 optical candidate
  89. GRB050820A: RTT150 optical observations
  90. GRB050820a: PROMPT RcIc Observations
  91. GRB050815: Maidanak optical observation
  92. XRF050509c: Radio upper limits from GMRT
  93. VLT/UVES spectroscopy of GRB050820
  94. GRB 050820A BAT observations of second, larger episode of emission
  95. GRB050813: Maidanak I-band observations
  96. GRB 050822: Swift-BAT refined analysis
  97. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  98. GRB050820B at FRAM
  99. GRB050820A: RTT150 optical observations
  100. GRB 050820a - corrections to GCN 3846

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