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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"

32697 results found.

  1. GRB 050911, optical observations
  2. GRB 050911: Swift-BAT refined analysis
  3. GRB 050911: z~0.16 cluster in the field
  4. GRB050908: detection of Swift/UVOT optical counterpart
  5. GRB 050910a: TAROT early optical limits
  6. RBO GRB 050908 observations
  7. WIRO observations in I of GRB 050908
  8. GRB 050906: Possible X-ray Counterpart
  9. GRB 050906: RTT150 optical observations
  10. GRB050908: Swift/UVOT Early upper limits
  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 050906: Optical observations at the Very Large Telescope
  22. GRB050904: CrAO optical observations
  23. GRB 050904 BAT refined analysis of complete data set
  24. GRB 050904: Subaru Optical Spectroscopy
  25. GRB 050906: MARGE Optical Limits
  26. GRB 050906: Swift-BAT refined analysis
  27. GRB 050906: Swift XRT upper limit
  28. GRB 050906: Radio Observations
  29. GRB 050904: Keck I-band Imaging
  30. GRB050906: P60 Observations
  31. GRB 050904: more VLT NIR observations
  32. GRB 050904: BOOTES early R-band observation
  33. GRB 050906: Bright galaxy in BAT error box
  34. GRB 050906: Swift/BAT Detection of a possible burst
  35. GRB 050904: More SOAR
  36. GRB 050904: photometric redshift
  37. GRB 050904: Swift/UVOT observations
  38. GRB 050904: Afterglow Astrometry
  39. GRB 050904: NIR object inside the XRT error box
  40. GRB 050904: early Swift XRT analysis results
  41. GRB 050904: SOAR YJ and PROMPT Ic Observations
  42. GRB 050904: BAT refined analysis of partial data set
  43. GRB050904: Optical Observations
  44. GRB 050904: Environmental Constraints
  45. GRB 050904: Possible High-Redshift GRB
  46. GRB 050904: SOAR/PROMPT Observations
  47. GRB050904: P60 Observations
  48. GRB 050904: TAROT optical limits
  49. GRB 050824: MDM Observations
  50. GRB 050827: Swift XRT preliminary analysis results
  51. GRB 050827 : OSN 1.5m optical observations
  52. GRB 050827: P200 NIR Observations
  53. GRB050827: Swift/UVOT upper limits
  54. GRB 050827: Optical Limit
  55. GRB 050827: XRT possible afterglow detection
  56. GRB 050826 : Lulin R band observation
  57. GRB050824: Maidanak optical limits
  58. GRB050820A: RTT150 optical observations
  59. GRB050827: RTT150 optical observations
  60. GRB 050827: Swift-BAT refined analysis
  61. GRB 050826: Optical Candidate
  62. GRB050824, HETE-2 Observation
  63. GRB 050826: Swift XRT preliminary analysis results
  64. GRB 050826: BAT refined analysis
  65. GRB050826: Swift/UVOT early upper limits
  66. GRB050824: First 2 hours of power low optical decay?
  67. GRB 050826: Swift XRT position
  68. GRB050824: MASTER final analysis of the OT observations
  69. GRB050824: CORRECTION to UVOT observing times
  70. GRB050824: Swift/UVOT detection of fading afterglow
  71. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  72. GRB050824: Radio Observations
  73. GRB 050824: Spectroscopic redshift from the VLT
  74. GRB 050822: refined XRT analysis
  75. GRB 050824: BAT refined analysis of a soft weak burst
  76. GRB050824: MASTER:OT decay
  77. GRB050824: MASTER observation OT
  78. GRB050805a: MASTER optical candidat
  79. GRB 050824: ROTSE-III Optical Limits
  80. GRB050820A: RTT150 optical observations
  81. GRB050820a: PROMPT RcIc Observations
  82. GRB050815: Maidanak optical observation
  83. XRF050509c: Radio upper limits from GMRT
  84. VLT/UVES spectroscopy of GRB050820
  85. GRB050822: Swift/UVOT upper limits
  86. GRB 050820A BAT observations of second, larger episode of emission
  87. GRB050813: Maidanak I-band observations
  88. GRB 050822: Swift-BAT refined analysis
  89. GRB050820A: RTT150 optical observations
  90. GRB 050820a - corrections to GCN 3846
  91. Swift/UVOT UV Photometry of GRB 050820B
  92. GRB 050822: ROTSE-III Prompt Optical Limits
  93. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  94. GRB050820A: Radio Observation
  95. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  96. GRB050820a BVRcIc field photometry
  97. GRB 050820a: NIR Observations by WIRO
  98. GRB 050820B: Swift XRT position
  99. GRB050820B: Refined analysis of the Swift-BAT burst
  100. Swift/UVOT photometry of GRB050820

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