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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

26363 results found.

  1. GRB050713b: Maidanak optical observations
  2. GRB 050724: Secure Host Redshift from Keck
  3. GRB 050724: WHT optical observations
  4. GRB050713: analysis of the XMM-Newton observation
  5. Swift-BAT trigger 147918 is not a real GRB
  6. GRB050724: VLT observations of the variable source
  7. GRB050709: Second Epoch Chandra Observation
  8. GRB050726: Swift-BAT detection of a weak burst
  9. GRB 050724: Optical Variability in Nearby Galaxy
  10. GRB 050724: J-band observations
  11. GRB 050724: GMOS Imaging and Spectroscopy
  12. GRB050724: Radio Observation
  13. GRB 050724: Optical imaging/astrometry
  14. GRB 050724: Swift/UVOT Upper Limit
  15. GRB050724: Refined analysis of the Swift-BAT possible short burst
  16. GRB 050724: possible host galaxy in DSS
  17. GRB 050721A: Swift-BAT refined analysis
  18. GRB 050721A: Early Swift XRT analysis results
  19. GRB050721A: optical decay
  20. GRB 050721: optical afterglow confirmed
  21. GRB 050709: Refined Spectral and Temporal Properties
  22. GRB050714b: Radio Observation
  23. GRB050712: Radio Observations
  24. GRB050713a: Radio Observation
  25. GRB 050712, Tautenburg optical afterglow observations
  26. Swift-BAT detection of a possible GRB
  27. GRB 050714B: VLT R-band observations
  28. GRB 050717: Additional LCO observations
  29. GRB 050716; J-band observations
  30. GRB 050717: LCO near-IR observations
  31. Swift/UVOT Observations of GRB 050717
  32. GRB 050717: Swift-BAT refined analysis
  33. GRB050717: Swift XRT position
  34. Swift detection of GRB 050717
  35. Swift UVOT Observations of GRB 050716
  36. GRB 050716: Refined XRT analysis.
  37. GRB050716: Refined analysis of the Swift-BAT burst
  38. GRB 050716: Lulin B and R band optical observations
  39. GRB050716, optical observation
  40. GRB050716: Faulkes North Telescope observation
  41. GRB050715: Refined analysis of the Swift-BAT burst
  42. GRB 050715: Swift-BAT detection
  43. GRB 050713b: RTT150 optical observations
  44. GRB050714B: Refined analysis of the Swift-BAT burst
  45. GRB 050714B: optical afterglow
  46. GRB 050714, R-band candidate
  47. GRB 050714, optical observations
  48. GRB 050713A: XRT refined analysis
  49. GRB 050713A: RAPTOR detection of early optical emission
  50. GRB050713B :Swift/UVOT observations
  51. GRB050713b: XRT refined analysis
  52. GRB050712: TNG R-band observations
  53. GRB 050713B: Swift-BAT Refined Analysis
  54. GRB 050713A: Swift/UVOT observation
  55. GRB 050713A : Swift-BAT Refined Analysis
  56. GRB050712: Swift UVOT Observation of Afterglow Emission
  57. GRB 050713A : Lulin R-band observation
  58. GRB 050713A XMM-Newton observation
  59. GRB 050713b : Lulin R-band observations
  60. GRB050713B: Faulkes North Telescope observation
  61. RBO RI observations of GRB 050713A
  62. GRB 050713B
  63. GRB050709 : Chandra source optical counterpart
  64. GRB050713: Liverpool Telescope prompt observations
  65. GRB 050712, optical observations
  66. GRB050709: Candidate X-ray Afterglow from Chandra
  67. GRB050713: possible I-band afterglow
  68. GRB050712: XRT refined analysis
  69. GRB050709: Radio Observations
  70. GRB 050709: Swift UVOT and XRT observations
  71. GRB 050712: Swift-BAT Refined Analysis
  72. GRB050712: UVOT candidate optical counterpart
  73. GRB 050709: LCO40 Observations
  74. GRB050709, optical observations
  75. PROMPT Rc Observations of GRB 050709
  76. GRB 050525a: PROMPT VRcIc Detections
  77. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  78. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  79. GRB 050626: Swift XRT observations
  80. GRB 050408: ARC 3.5-meter NIR Observations
  81. GRB 050701: Refined XRT analysis
  82. Swift UVOT observations of GRB 050701
  83. GRB050701: Swift-BAT Refined analysis
  84. Swift trigger 143708 is really GRB 050701
  85. GRB 050607, radio observations
  86. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  87. GRB050525a: HST Observations
  88. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  89. XRF 050509c: Optical monitoring
  90. Konus-Wind observation of an intermediate burst from SGR 1806-20
  91. XRF050509c: Radio Detection
  92. GRB 050607 optical decay
  93. GRB050607: refined analysis of prompt REM observations
  94. GRB 050607: PROMPT VRcIc Observations
  95. GRB 050607: Optical decay and spectral slope
  96. GRB050607,optical observation
  97. Optical Afterglow of GRB 050607
  98. GRB050607: Swift Detection of a long GRB
  99. GRB050607: prompt REM observations
  100. Limits on a SN in the field of GRB 050509b

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