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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').
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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"

36074 results found.

  1. GRB 050724: WHT optical observations
  2. GRB 050724: Chandra Observations of the X-ray Afterglow
  3. GRB050713: analysis of the XMM-Newton observation
  4. GRB 050724, SMARTS optical/IR afterglow observations
  5. GRB 050726, SMARTS optical/IR observations
  6. Swift-BAT trigger 147918 is not a real GRB
  7. GRB 050727: RTT150 optical observations
  8. GRB050727: KAIT optical limit
  9. GRB050709: Second Epoch Chandra Observation
  10. GRB 050726: PROMPT Rc Observations
  11. GRB050709: Second Epoch Chandra Observation
  12. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  13. GRB 050726: early Swift XRT analysis results
  14. GRB 050724: Optical Variability in Nearby Galaxy
  15. GRB 050724: J-band observations
  16. GRB 050724: GMOS Imaging and Spectroscopy
  17. GRB 050724: SWIFT XRT refined position
  18. GRB 050724: spectroscopy of object in the XRT error circle
  19. GRB 050724: Optical limit
  20. GRB 050724: optical and near-IR observations
  21. GRB 050724: Optical imaging/astrometry
  22. GRB 050724: RTT150 optical observations
  23. GRB 050724: Swift/UVOT Upper Limit
  24. GRB 050724: early Swift XRT analysis results
  25. GRB 050724 : Lulin early R-band monitoring observations
  26. GRB050724: Refined analysis of the Swift-BAT possible short burst
  27. GRB 050724: possible host galaxy in DSS
  28. Swift-BAT trigger 147325 is not due to a real GRB
  29. GRB050723: XRT distributed coordinates are not related to the burst
  30. GRB 050721: early afterglow light curve
  31. GRB 050721A: Swift-BAT refined analysis
  32. Correction to GCN Circ 3474 on GRB050525A
  33. GRB 050721A: Early Swift XRT analysis results
  34. GRB050721A: optical decay
  35. GRB 050721: optical afterglow confirmed
  36. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  37. GRB 050721a: Optical Observations
  38. GRB 050709: Refined Spectral and Temporal Properties
  39. GRB 050717: PROMPT RcIc Observations
  40. GRB 050714a: Refined XRT analysis and afterglow confirmation
  41. Swift-BAT trigger 146731 is not a real GRB
  42. GRB 050712, Tautenburg optical afterglow observations
  43. Swift-BAT detection of a possible GRB
  44. GRB 050714B: VLT R-band observations
  45. GRB 050717: Additional LCO observations
  46. GRB050717
  47. GRB 050716; J-band observations
  48. Konus-Wind observation of GRB 050717
  49. GRB 050717: LCO near-IR observations
  50. Swift/UVOT Observations of GRB 050717
  51. GRB 050717: Swift-BAT refined analysis
  52. GRB 050717: Refined XRT analysis.
  53. GRB050712: optical limits
  54. Swift detection of GRB 050717
  55. GRB 050716 - UKIRT identification of candidate afterglow
  56. Swift UVOT Observations of GRB 050716
  57. GRB 050716: Refined XRT analysis.
  58. GRB 050716: Lulin B and R band optical observations
  59. GRB050716, optical observation
  60. GRB 050716: Optical Observations
  61. GRB050716: Faulkes North Telescope observation
  62. Swift/BAT detection of GRB 050716
  63. GRB 050715: Swift-BAT detection
  64. Swift UVOT Observations of GRB 050714B
  65. Konus-Wind observation of GRB 050713A
  66. GRB 050714B: refined XRT analysis
  67. GRB 050713b: RTT150 optical observations
  68. GRB 050714B: candidate afterglow does not fade
  69. GRB050714B: Refined analysis of the Swift-BAT burst
  70. GRB 050714B: optical afterglow
  71. Swift detection of a long transient (GRB 050714B?)
  72. GRB 050709: optical afterglow candidate
  73. GRB 050714, R-band candidate
  74. GRB 050714: Swift XRT afterglow position
  75. GRB 050714, optical observations
  76. GRB 050714A: ROTSE-III Optical Limits
  77. GRB 050714 - A long GRB detected with INTEGRAL
  78. GRB 050713A: XRT refined analysis
  79. GRB 050709: Spectroscopy
  80. GRB 050713A: RAPTOR detection of early optical emission
  81. GRB050713B :Swift/UVOT observations
  82. GRB050712: TNG R-band observations
  83. GRB 050713B: Swift-BAT Refined Analysis
  84. Swift-BAT Trigger 145729 is not a GRB
  85. GRB 050713A: Swift/UVOT observation
  86. GRB 050713A : Swift-BAT Refined Analysis
  87. GRB 050713A : Lulin R-band observation
  88. GRB 050713A XMM-Newton observation
  89. GRB 050713b : Lulin R-band observations
  90. GRB050713B: Faulkes North Telescope observation
  91. RBO RI observations of GRB 050713A
  92. GRB 050713B
  93. GRB050709 : Chandra source optical counterpart
  94. GRB050713: Liverpool Telescope prompt observations
  95. GRB 050712, optical observations
  96. GRB 050713 : Planned XMM-Newton observation
  97. GRB050709: Candidate X-ray Afterglow from Chandra
  98. GRB 050713, R-band observations at NOT
  99. GRB 050713: ARC NIR Detections and Identification of Fading
  100. GRB050713: possible I-band afterglow

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