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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"

36093 results found.

  1. GRB 050906: RTT150 optical observations
  2. GRB050908: VLT R-band decay index.
  3. GRB 050908: Swift-BAT refined analysis
  4. GRB 050908: Optical observations
  5. Gemini Spectroscopy of GRB 050908
  6. GRB 050908: spectroscopic redshift
  7. GRB 050908: Prompt PROMPT Observations
  8. GRB 050908 : Swift XRT position
  9. GRB 050908: KAIT observations
  10. GRB 050908: P60 Confirmation of Optical Afterglow
  11. GRB 050908: Optical Observations
  12. GRB 050908: Swift detection of a burst
  13. Swift trigger 154073 is not a GRB
  14. GRB 050906: Optical observations at the Very Large Telescope
  15. GRB050904: CrAO optical observations
  16. GRB 050904 BAT refined analysis of complete data set
  17. GRB 050904: Subaru Optical Spectroscopy
  18. GRB 050906: MARGE Optical Limits
  19. GRB 050906: Swift-BAT refined analysis
  20. GRB 050906: Swift XRT upper limit
  21. GRB 050906: Radio Observations
  22. GRB 050904: Keck I-band Imaging
  23. GRB 050904: more VLT NIR observations
  24. GRB 050904: BOOTES early R-band observation
  25. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  26. GRB 050906: Bright galaxy in BAT error box
  27. GRB 050906: Swift/BAT Detection of a possible burst
  28. GRB 050904: More SOAR
  29. GRB 050904: photometric redshift
  30. GRB 050904: Swift/UVOT observations
  31. GRB 050904: Afterglow Astrometry
  32. GRB 050904: NIR object inside the XRT error box
  33. GRB 050904: early Swift XRT analysis results
  34. GRB 050904: SOAR YJ and PROMPT Ic Observations
  35. GRB 050904: BAT refined analysis of partial data set
  36. GRB 050904: TAROT optical measurements
  37. GRB050904: Optical Observations
  38. GRB 050904: Environmental Constraints
  39. GRB 050904: Possible High-Redshift GRB
  40. GRB 050904: SOAR/PROMPT Observations
  41. GRB 050904: TAROT optical limits
  42. Swift-BAT triggers 153461-153465 are not GRBs
  43. GRB 050824: MDM Observations
  44. GRB 050827: Swift XRT preliminary analysis results
  45. IBAS Alerts 2641 and 2642: not a real GRB
  46. Swift Trigger #152652 is not a GRB
  47. GRB 050827 : OSN 1.5m optical observations
  48. GRB 050827: P200 NIR Observations
  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. GRB050824: First 2 hours of power low optical decay?
  61. GRB 050826: Swift XRT position
  62. GRB050826: Swift-BAT detection of a long burst
  63. GRB050824: MASTER final analysis of the OT observations
  64. Possible GRB050825:MASTER optical observations
  65. Swift-BAT trigger 152038 is definitely not a GRB
  66. Swift-BAT trigger 152038 is probably not a GRB
  67. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  68. GRB050824, I-band imaging
  69. GRB050824: Radio Observations
  70. GRB 050824: Spectroscopic redshift from the VLT
  71. GRB 050822: refined XRT analysis
  72. GRB 050824: XRT refined analysis and possible afterglow detection
  73. GRB 050824: BAT refined analysis of a soft weak burst
  74. GRB050824: MASTER:OT decay
  75. GRB050824: MASTER observation OT
  76. GRB050805a: MASTER optical candidat
  77. GRB 050824: ROTSE-III Optical Limits
  78. GRB050824: Swift-BAT detection of a burst
  79. GRB 050824 optical candidate
  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. GRB 050820A BAT observations of second, larger episode of emission
  86. GRB050813: Maidanak I-band observations
  87. GRB 050822: Swift-BAT refined analysis
  88. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  89. GRB050820B at FRAM
  90. GRB050820A: RTT150 optical observations
  91. GRB 050820a - corrections to GCN 3846
  92. Swift/UVOT UV Photometry of GRB 050820B
  93. GRB 050822: ROTSE-III Prompt Optical Limits
  94. GRB 050822: Swift detection of a long burst
  95. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  96. GRB050820A: Radio Observation
  97. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  98. GRB050820a BVRcIc field photometry
  99. GRB 050820a: NIR Observations by WIRO
  100. GRB 050820B: Swift XRT position

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