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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.

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

18651 results found.

  1. GRB050727: KAIT optical limit
  2. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  3. GRB 050726: early Swift XRT analysis results
  4. GRB050726: Swift-BAT detection of a weak burst
  5. GRB 050724: SWIFT XRT refined position
  6. GRB 050724: optical and near-IR observations
  7. GRB 050724: Swift/UVOT Upper Limit
  8. GRB 050724: early Swift XRT analysis results
  9. GRB050724: Refined analysis of the Swift-BAT possible short burst
  10. GRB050724: a short-burst detected by Swift
  11. Swift-BAT trigger 147325 is not due to a real GRB
  12. GRB050723: XRT distributed coordinates are not related to the burst
  13. GRB 050721A: Swift-BAT refined analysis
  14. GRB 050721A: Early Swift XRT analysis results
  15. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  16. GRB 050721a: Optical Observations
  17. GRB050721A: Swift-BAT detection of a weak burst
  18. GRB 050714a: Refined XRT analysis and afterglow confirmation
  19. Swift-BAT trigger 146731 is not a real GRB
  20. Swift-BAT detection of a possible GRB
  21. GRB050717
  22. Konus-Wind observation of GRB 050717
  23. Swift/UVOT Observations of GRB 050717
  24. GRB 050717: Swift-BAT refined analysis
  25. GRB 050717: Refined XRT analysis.
  26. GRB050712: optical limits
  27. GRB050717: Swift XRT position
  28. Swift detection of GRB 050717
  29. GRB 050716 - UKIRT identification of candidate afterglow
  30. Swift UVOT Observations of GRB 050716
  31. GRB 050716: Refined XRT analysis.
  32. GRB050716: Refined analysis of the Swift-BAT burst
  33. GRB050716, optical observation
  34. GRB050716: Faulkes North Telescope observation
  35. GRB050716: Correction to sign in XRT coordinate
  36. Swift/BAT detection of GRB 050716
  37. GRB050715: Refined analysis of the Swift-BAT burst
  38. GRB 050715: Swift-BAT detection
  39. Swift UVOT Observations of GRB 050714B
  40. Konus-Wind observation of GRB 050713A
  41. GRB 050714B: refined XRT analysis
  42. GRB050714B: Refined analysis of the Swift-BAT burst
  43. Swift detection of a long transient (GRB 050714B?)
  44. GRB 050714: Swift XRT afterglow position
  45. GRB 050713A: XRT refined analysis
  46. GRB 050713A: RAPTOR detection of early optical emission
  47. GRB050713B :Swift/UVOT observations
  48. GRB050713b: XRT refined analysis
  49. GRB 050713B: Swift-BAT Refined Analysis
  50. Swift-BAT Trigger 145729 is not a GRB
  51. GRB 050713A: Swift/UVOT observation
  52. GRB 050713A : Swift-BAT Refined Analysis
  53. GRB050712: Swift UVOT Observation of Afterglow Emission
  54. GRB 050713A XMM-Newton observation
  55. GRB050713B: Faulkes North Telescope observation
  56. RBO RI observations of GRB 050713A
  57. GRB 050713B
  58. GRB050713: Liverpool Telescope prompt observations
  59. GRB050709: Candidate X-ray Afterglow from Chandra
  60. GRB 050713, R-band observations at NOT
  61. GRB 050713: Swift detection of Bright Burst
  62. GRB 050713A: ROTSE-III Optical Limits
  63. GRB050712: XRT refined analysis
  64. GRB 050709: Swift UVOT and XRT observations
  65. GRB 050712: Swift-BAT Refined Analysis
  66. GRB050712: UVOT candidate optical counterpart
  67. GRB 050712: Swift XRT afterglow position
  68. GRB 050712: Swift detection of a weak burst
  69. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  70. GRB 050626: Swift XRT observations
  71. GRB 050701
  72. GRB 050701, optical observations
  73. GRB 050701: Refined XRT analysis
  74. Swift UVOT observations of GRB 050701
  75. GRB050701: Swift-BAT Refined analysis
  76. GRB 050701: Swift XRT afterglow position
  77. Swift trigger 143708 is really GRB 050701
  78. GRB 050525A: Swift Late-Time Decay Rate
  79. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  80. GRB 050416(a): Host Galaxy Redshift Determination
  81. Swift/UVOT observations of GRB050607
  82. GRB 050607: RAPTOR-S Early Optical Limits
  83. GRB050607: KAIT optical limits
  84. GRB 050607: MDM Observations
  85. GRB050607,optical observation
  86. GRB 050607 - XRT refined data analysis
  87. GRB050607 optical limit by "Pi of the Sky"
  88. GRB050607: Swift Detection of a long GRB
  89. GRB 050603 - XRT data analysis of the first day
  90. Konus-Wind observation of GRB 050603
  91. GRB 050603: Analysis of UVOT data
  92. GRB050603: Fading Afterglow observed by Swift UVOT
  93. GRB 050603: Swift XRT Position
  94. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  95. Swift/BAT Detection of GRB050603
  96. GRB 050408: jet break in the XRT light curve
  97. GRB050528, XRT observations
  98. Correction to GCN Circ 3502 on GRB 050528
  99. Swift-BAT GRB 050528: a soft burst
  100. Update on Swift-BAT GRB 050528 (Trigger 130679)

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