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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

21932 results found.

  1. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  2. GRB 050730, SMARTS optical/IR afterglow observations
  3. GRB050730: Liverpool Telescope optical observations
  4. GRB050730: Swift-BAT detection of a weak burst
  5. GRB 050709: PROMPT Rc Observations
  6. GRB050713b: Maidanak optical observations
  7. GRB 050724: Secure Host Redshift from Keck
  8. GRB 050724: WHT optical observations
  9. GRB050726: Swift UVOT observations
  10. GRB 050724: Chandra Observations of the X-ray Afterglow
  11. GRB050724: Refined Radio Position
  12. GRB 050724, SMARTS optical/IR afterglow observations
  13. GRB 050726, SMARTS optical/IR observations
  14. GRB 050727: RTT150 optical observations
  15. GRB050724: VLT observations of the variable source
  16. GRB 050726: PROMPT Rc Observations
  17. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  18. GRB050724: Further Radio Observations
  19. GRB 050726: early Swift XRT analysis results
  20. GRB050726: Swift-BAT detection of a weak burst
  21. GRB 050724: Optical Variability in Nearby Galaxy
  22. GRB 050724: J-band observations
  23. GRB 050724: GMOS Imaging and Spectroscopy
  24. GRB050724: Radio Observation
  25. GRB 050724: spectroscopy of object in the XRT error circle
  26. GRB 050724: optical and near-IR observations
  27. GRB 050724: Optical imaging/astrometry
  28. GRB 050724: RTT150 optical observations
  29. GRB 050724 : Lulin early R-band monitoring observations
  30. GRB 050724: possible host galaxy in DSS
  31. GRB 050721: early afterglow light curve
  32. GRB 050721: optical afterglow confirmed
  33. GRB 050721a: Optical Observations
  34. GRB 050717: PROMPT RcIc Observations
  35. GRB050712: Radio Observations
  36. GRB 050712, Tautenburg optical afterglow observations
  37. Swift-BAT detection of a possible GRB
  38. GRB 050714B: VLT R-band observations
  39. GRB 050717: Additional LCO observations
  40. GRB 050716; J-band observations
  41. GRB 050717: LCO near-IR observations
  42. Swift/UVOT Observations of GRB 050717
  43. GRB 050717: Refined XRT analysis.
  44. Swift detection of GRB 050717
  45. GRB 050716 - UKIRT identification of candidate afterglow
  46. Swift UVOT Observations of GRB 050716
  47. GRB 050716: Refined XRT analysis.
  48. GRB 050716: Lulin B and R band optical observations
  49. GRB 050716: Optical Observations
  50. GRB050716: Faulkes North Telescope observation
  51. Swift/BAT detection of GRB 050716
  52. Swift UVOT Observations of GRB 050714B
  53. GRB 050714B: refined XRT analysis
  54. GRB 050713b: RTT150 optical observations
  55. Swift detection of a long transient (GRB 050714B?)
  56. GRB 050709: optical afterglow candidate
  57. GRB 050714, optical observations
  58. GRB 050709: Spectroscopy
  59. GRB050713B :Swift/UVOT observations
  60. GRB050712: TNG R-band observations
  61. GRB050712: Swift UVOT Observation of Afterglow Emission
  62. GRB 050713A : Lulin R-band observation
  63. GRB 050713b : Lulin R-band observations
  64. GRB050713B: Faulkes North Telescope observation
  65. RBO RI observations of GRB 050713A
  66. GRB 050713B
  67. GRB050713: Liverpool Telescope prompt observations
  68. GRB 050712, optical observations
  69. GRB050709: Candidate X-ray Afterglow from Chandra
  70. GRB 050713, R-band observations at NOT
  71. GRB 050713: ARC NIR Detections and Identification of Fading
  72. GRB 050713: Swift detection of Bright Burst
  73. GRB050709: Radio Observations
  74. GRB 050709: Swift UVOT and XRT observations
  75. GRB 050712: Swift detection of a weak burst
  76. GRB 050709: LCO40 Observations
  77. GRB050709, optical observations
  78. PROMPT Rc Observations of GRB 050709
  79. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  80. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  81. GRB 050626 optical observations
  82. GRB 050626: Swift XRT observations
  83. GRB 050701, optical observations
  84. GRB 050408: ARC 3.5-meter NIR Observations
  85. Swift UVOT observations of GRB 050701
  86. GRB 050607, radio observations
  87. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  88. GRB 050525A: Swift Late-Time Decay Rate
  89. GRB050525a: HST Observations
  90. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  91. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  92. XRF 050509c: Optical monitoring
  93. XRF050509c: Radio Detection
  94. GRB 050416(a): Host Galaxy Redshift Determination
  95. GRB 050607: MDM Observation
  96. GRB 050607 optical decay
  97. GRB 050607: RTT150 optical observations
  98. GRB050607: refined analysis of prompt REM observations
  99. Swift/UVOT observations of GRB050607
  100. GRB 050607 : Lulin R-band observation

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