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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"

18631 results found.

  1. GRB050717
  2. Konus-Wind observation of GRB 050717
  3. Swift/UVOT Observations of GRB 050717
  4. GRB 050717: Swift-BAT refined analysis
  5. GRB 050717: Refined XRT analysis.
  6. GRB050712: optical limits
  7. GRB050717: Swift XRT position
  8. Swift detection of GRB 050717
  9. GRB 050716 - UKIRT identification of candidate afterglow
  10. Swift UVOT Observations of GRB 050716
  11. GRB 050716: Refined XRT analysis.
  12. GRB050716: Refined analysis of the Swift-BAT burst
  13. GRB050716, optical observation
  14. GRB050716: Faulkes North Telescope observation
  15. GRB050716: Correction to sign in XRT coordinate
  16. Swift/BAT detection of GRB 050716
  17. GRB050715: Refined analysis of the Swift-BAT burst
  18. GRB 050715: Swift-BAT detection
  19. Swift UVOT Observations of GRB 050714B
  20. Konus-Wind observation of GRB 050713A
  21. GRB 050714B: refined XRT analysis
  22. GRB050714B: Refined analysis of the Swift-BAT burst
  23. Swift detection of a long transient (GRB 050714B?)
  24. GRB 050714: Swift XRT afterglow position
  25. GRB 050713A: XRT refined analysis
  26. GRB 050713A: RAPTOR detection of early optical emission
  27. GRB050713B :Swift/UVOT observations
  28. GRB050713b: XRT refined analysis
  29. GRB 050713B: Swift-BAT Refined Analysis
  30. Swift-BAT Trigger 145729 is not a GRB
  31. GRB 050713A: Swift/UVOT observation
  32. GRB 050713A : Swift-BAT Refined Analysis
  33. GRB050712: Swift UVOT Observation of Afterglow Emission
  34. GRB 050713A XMM-Newton observation
  35. GRB050713B: Faulkes North Telescope observation
  36. RBO RI observations of GRB 050713A
  37. GRB 050713B
  38. GRB050713: Liverpool Telescope prompt observations
  39. GRB050709: Candidate X-ray Afterglow from Chandra
  40. GRB 050713, R-band observations at NOT
  41. GRB 050713: Swift detection of Bright Burst
  42. GRB 050713A: ROTSE-III Optical Limits
  43. GRB050712: XRT refined analysis
  44. GRB 050709: Swift UVOT and XRT observations
  45. GRB 050712: Swift-BAT Refined Analysis
  46. GRB050712: UVOT candidate optical counterpart
  47. GRB 050712: Swift XRT afterglow position
  48. GRB 050712: Swift detection of a weak burst
  49. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  50. GRB 050626: Swift XRT observations
  51. GRB 050701
  52. GRB 050701, optical observations
  53. GRB 050701: Refined XRT analysis
  54. Swift UVOT observations of GRB 050701
  55. GRB050701: Swift-BAT Refined analysis
  56. GRB 050701: Swift XRT afterglow position
  57. Swift trigger 143708 is really GRB 050701
  58. GRB 050525A: Swift Late-Time Decay Rate
  59. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  60. GRB 050416(a): Host Galaxy Redshift Determination
  61. Swift/UVOT observations of GRB050607
  62. GRB 050607: RAPTOR-S Early Optical Limits
  63. GRB050607: KAIT optical limits
  64. GRB 050607: MDM Observations
  65. GRB050607,optical observation
  66. GRB 050607 - XRT refined data analysis
  67. GRB050607 optical limit by "Pi of the Sky"
  68. GRB050607: Swift Detection of a long GRB
  69. GRB 050603 - XRT data analysis of the first day
  70. Konus-Wind observation of GRB 050603
  71. GRB 050603: Analysis of UVOT data
  72. GRB050603: Fading Afterglow observed by Swift UVOT
  73. GRB 050603: Swift XRT Position
  74. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  75. Swift/BAT Detection of GRB050603
  76. GRB 050408: jet break in the XRT light curve
  77. GRB050528, XRT observations
  78. Correction to GCN Circ 3502 on GRB 050528
  79. Swift-BAT GRB 050528: a soft burst
  80. Update on Swift-BAT GRB 050528 (Trigger 130679)
  81. Possible GRB050528: no candidate from Liverpool Telescope
  82. Swift-BAT detection of possible GRB 050528
  83. GRB 050509b: refined XRT/Chandra afterglow position analysis
  84. GRB050525a: optical upper limits
  85. GRB 050525B: Swift-BAT observations
  86. GRB050525A,optical observation
  87. GRB050525: Super-LOTIS observations
  88. GRB 050525, spectral lag pseudo-redshift
  89. GRB050306: optical afterglow not confirmed
  90. GRB 050525A: BOOTES simultaneous optical observations
  91. GRB 050525A: Swift-BAT refined analysis
  92. Swift/UVOT UV and optical detections of GRB 050525
  93. Konus-Wind observation of GRB 050525
  94. GRB 050525: TAROT observations of the early afterglow
  95. INTEGRAL detection of GRB 050525
  96. GRB 050525: Optical observation
  97. GRB050525: ROTSE-III Refined Analysis
  98. GRB 050525 - Very Bright, Not Short
  99. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  100. GRB 050525A: ROTSE-III Detection of Possible Counterpart

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