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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"

22216 results found.

  1. HETE Fregate observations of GRB 050922C
  2. GRB050922C: optical observations
  3. GRB 050922C: NOT optical observations
  4. GRB 050922C: ROTSE-IIId Refined Analysis
  5. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  6. GRB050918: Possible Swift/XRT detected afterglow
  7. GRB 050915a: Radio Observations
  8. Swift-BAT trigger 155764 is not a GRB
  9. Swift-BAT trigger 155764 is probably not a GRB
  10. GRB 050915b, SMARTS optical/IR observations of the XRT position
  11. GRB 050915b, SMARTS optical/IR observations
  12. GRB 050915: IR Observations
  13. GRB050915: P60 Optical Observations
  14. GRB050915, optical observations
  15. Swift-BAT trigger 155072 ground analysis
  16. GRB 050911: LCO limits on a variable source
  17. GRB050911: Swift UVOT followup observations
  18. GRB 050911, optical content of Swift/XRT error box
  19. GRB 050911: LCO observations
  20. GRB 050911, optical observations
  21. GRB 050910a: TAROT early optical limits
  22. RBO GRB 050908 observations
  23. WIRO observations in I of GRB 050908
  24. GRB 050906: Possible X-ray Counterpart
  25. GRB 050906: RTT150 optical observations
  26. GRB050908: VLT R-band decay index.
  27. GRB 050908: Optical observations
  28. Gemini Spectroscopy of GRB 050908
  29. GRB 050908: Prompt PROMPT Observations
  30. GRB 050908: KAIT observations
  31. GRB 050908: P60 Confirmation of Optical Afterglow
  32. GRB 050908: Optical Observations
  33. GRB 050908: Swift detection of a burst
  34. Swift trigger 154073 is not a GRB
  35. GRB 050906: Optical observations at the Very Large Telescope
  36. GRB050904: CrAO optical observations
  37. GRB 050906: Swift-BAT refined analysis
  38. GRB 050906: Swift XRT upper limit
  39. GRB 050906: Radio Observations
  40. GRB050906: P60 Observations
  41. GRB 050904: more VLT NIR observations
  42. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  43. GRB 050904: More SOAR
  44. GRB 050904: Swift/UVOT observations
  45. GRB 050904: NIR object inside the XRT error box
  46. GRB 050904: SOAR YJ and PROMPT Ic Observations
  47. GRB050904: Optical Observations
  48. GRB 050904: Environmental Constraints
  49. GRB 050904: Possible High-Redshift GRB
  50. GRB 050904: SOAR/PROMPT Observations
  51. GRB050904: P60 Observations
  52. GRB050904: Swift-BAT detection of a probable burst
  53. GRB 050824: MDM Observations
  54. GRB 050827 : OSN 1.5m optical observations
  55. GRB 050827: P200 NIR Observations
  56. GRB 050826 : Lulin R band observation
  57. GRB050820A: RTT150 optical observations
  58. GRB050827: RTT150 optical observations
  59. Subaru Observations of GRB050724
  60. GRB 050826: Optical Candidate
  61. GRB050824, HETE-2 Observation
  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. GRB050824: CORRECTION to UVOT observing times
  66. GRB050824: Swift/UVOT detection of fading afterglow
  67. GRB050824, I-band imaging
  68. GRB050824: Radio Observations
  69. GRB 050824: ROTSE-III Optical Limits
  70. GRB 050824 optical candidate
  71. GRB050820A: RTT150 optical observations
  72. GRB050820a: PROMPT RcIc Observations
  73. VLT/UVES spectroscopy of GRB050820
  74. GRB 050820A BAT observations of second, larger episode of emission
  75. GRB050813: Maidanak I-band observations
  76. GRB050820B at FRAM
  77. GRB050820A: RTT150 optical observations
  78. GRB 050822: ROTSE-III Prompt Optical Limits
  79. GRB050820A: Radio Observation
  80. GRB 050820a: NIR Observations by WIRO
  81. GRB 050820B: Swift XRT position
  82. Swift/UVOT photometry of GRB050820
  83. GRB050820: refined XRT analysis
  84. GRB 050820: P60 Temporal Decay Index
  85. GRB 050820: High Resolution Spectroscopy from Keck
  86. GRB050819: refined XRT analysis
  87. GRB050819: RTT150 optical observations
  88. GRB 050820: Swift detection of a GRB
  89. Swift-BAT trigger 150993 is not a GRB
  90. GRB 050817: Optical observations
  91. GRB 050815: Radio Observation
  92. GRB050814: Radio Observation
  93. GRB050817: Negative Optical Observations
  94. GRB050817: Swift-BAT Detection of a burst
  95. GRB050815: Optical afterglow detection by Swift UVOT
  96. GRB 050813: Radio Observations
  97. GRB 050730: Third Epoch WSRT Radio Observations
  98. GRB050814: P60 Optical Afterglow Candidate
  99. GRB 050813: Non-fading of afterglow candidate
  100. GRB 050814: XRT refined analysis

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