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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"

32692 results found.

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

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