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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"

35997 results found.

  1. GRB 050910a: TAROT early optical limits
  2. RBO GRB 050908 observations
  3. WIRO observations in I of GRB 050908
  4. GRB 050906: Possible X-ray Counterpart
  5. GRB 050906: RTT150 optical observations
  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 050908: Swift detection of a burst
  17. Swift trigger 154073 is not a GRB
  18. GRB 050906: Optical observations at the Very Large Telescope
  19. GRB050904: CrAO optical observations
  20. GRB 050904 BAT refined analysis of complete data set
  21. GRB 050904: Subaru Optical Spectroscopy
  22. GRB 050906: MARGE Optical Limits
  23. GRB 050906: Swift-BAT refined analysis
  24. GRB 050906: Swift XRT upper limit
  25. GRB 050906: Radio Observations
  26. GRB 050904: Keck I-band Imaging
  27. GRB 050904: more VLT NIR observations
  28. GRB 050904: BOOTES early R-band observation
  29. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  30. GRB 050906: Bright galaxy in BAT error box
  31. GRB 050906: Swift/BAT Detection of a possible burst
  32. GRB 050904: More SOAR
  33. GRB 050904: photometric redshift
  34. GRB 050904: Swift/UVOT observations
  35. GRB 050904: Afterglow Astrometry
  36. GRB 050904: NIR object inside the XRT error box
  37. GRB 050904: early Swift XRT analysis results
  38. GRB 050904: SOAR YJ and PROMPT Ic Observations
  39. GRB 050904: BAT refined analysis of partial data set
  40. GRB 050904: TAROT optical measurements
  41. GRB050904: Optical Observations
  42. GRB 050904: Environmental Constraints
  43. GRB 050904: Possible High-Redshift GRB
  44. GRB 050904: SOAR/PROMPT Observations
  45. GRB 050904: TAROT optical limits
  46. Swift-BAT triggers 153461-153465 are not GRBs
  47. GRB 050824: MDM Observations
  48. GRB 050827: Swift XRT preliminary analysis results
  49. IBAS Alerts 2641 and 2642: not a real GRB
  50. Swift Trigger #152652 is not a GRB
  51. GRB 050827 : OSN 1.5m optical observations
  52. GRB 050827: P200 NIR Observations
  53. GRB 050827: Optical Limit
  54. GRB 050827: XRT possible afterglow detection
  55. GRB 050826 : Lulin R band observation
  56. GRB050824: Maidanak optical limits
  57. GRB050820A: RTT150 optical observations
  58. GRB050827: RTT150 optical observations
  59. GRB 050827: Swift-BAT refined analysis
  60. GRB 050826: Optical Candidate
  61. GRB050824, HETE-2 Observation
  62. GRB 050826: Swift XRT preliminary analysis results
  63. GRB 050826: BAT refined analysis
  64. GRB050824: First 2 hours of power low optical decay?
  65. GRB 050826: Swift XRT position
  66. GRB050826: Swift-BAT detection of a long burst
  67. GRB050824: MASTER final analysis of the OT observations
  68. Possible GRB050825:MASTER optical observations
  69. Swift-BAT trigger 152038 is definitely not a GRB
  70. Swift-BAT trigger 152038 is probably not a GRB
  71. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  72. GRB050824, I-band imaging
  73. GRB050824: Radio Observations
  74. GRB 050824: Spectroscopic redshift from the VLT
  75. GRB 050822: refined XRT analysis
  76. GRB 050824: XRT refined analysis and possible afterglow detection
  77. GRB 050824: BAT refined analysis of a soft weak burst
  78. GRB050824: MASTER:OT decay
  79. GRB050824: MASTER observation OT
  80. GRB050805a: MASTER optical candidat
  81. GRB 050824: ROTSE-III Optical Limits
  82. GRB050824: Swift-BAT detection of a burst
  83. GRB 050824 optical candidate
  84. GRB050820A: RTT150 optical observations
  85. GRB050820a: PROMPT RcIc Observations
  86. GRB050815: Maidanak optical observation
  87. XRF050509c: Radio upper limits from GMRT
  88. VLT/UVES spectroscopy of GRB050820
  89. GRB 050820A BAT observations of second, larger episode of emission
  90. GRB050813: Maidanak I-band observations
  91. GRB 050822: Swift-BAT refined analysis
  92. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  93. GRB050820B at FRAM
  94. GRB050820A: RTT150 optical observations
  95. GRB 050820a - corrections to GCN 3846
  96. Swift/UVOT UV Photometry of GRB 050820B
  97. GRB 050822: ROTSE-III Prompt Optical Limits
  98. GRB 050822: Swift detection of a long burst
  99. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  100. GRB050820A: Radio Observation

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