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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"

19554 results found.

  1. GRB 050717: Refined XRT analysis.
  2. GRB050712: optical limits
  3. GRB050717: Swift XRT position
  4. Swift detection of GRB 050717
  5. GRB 050716 - UKIRT identification of candidate afterglow
  6. Swift UVOT Observations of GRB 050716
  7. GRB 050716: Refined XRT analysis.
  8. GRB050716: Refined analysis of the Swift-BAT burst
  9. GRB050716, optical observation
  10. GRB050716: Faulkes North Telescope observation
  11. GRB050716: Correction to sign in XRT coordinate
  12. Swift/BAT detection of GRB 050716
  13. GRB050715: Refined analysis of the Swift-BAT burst
  14. GRB 050715: Swift-BAT detection
  15. Swift UVOT Observations of GRB 050714B
  16. Konus-Wind observation of GRB 050713A
  17. GRB 050714B: refined XRT analysis
  18. GRB050714B: Refined analysis of the Swift-BAT burst
  19. Swift detection of a long transient (GRB 050714B?)
  20. GRB 050714: Swift XRT afterglow position
  21. GRB 050713A: XRT refined analysis
  22. GRB 050713A: RAPTOR detection of early optical emission
  23. GRB050713B :Swift/UVOT observations
  24. GRB050713b: XRT refined analysis
  25. GRB 050713B: Swift-BAT Refined Analysis
  26. Swift-BAT Trigger 145729 is not a GRB
  27. GRB 050713A: Swift/UVOT observation
  28. GRB 050713A : Swift-BAT Refined Analysis
  29. GRB050712: Swift UVOT Observation of Afterglow Emission
  30. GRB 050713A XMM-Newton observation
  31. GRB050713B: Faulkes North Telescope observation
  32. RBO RI observations of GRB 050713A
  33. GRB 050713B
  34. GRB050713: Liverpool Telescope prompt observations
  35. GRB050709: Candidate X-ray Afterglow from Chandra
  36. GRB 050713, R-band observations at NOT
  37. GRB 050713: Swift detection of Bright Burst
  38. GRB 050713A: ROTSE-III Optical Limits
  39. GRB050712: XRT refined analysis
  40. GRB 050709: Swift UVOT and XRT observations
  41. GRB 050712: Swift-BAT Refined Analysis
  42. GRB050712: UVOT candidate optical counterpart
  43. GRB 050712: Swift XRT afterglow position
  44. GRB 050712: Swift detection of a weak burst
  45. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  46. GRB 050626: Swift XRT observations
  47. GRB 050701
  48. GRB 050701, optical observations
  49. GRB 050701: Refined XRT analysis
  50. Swift UVOT observations of GRB 050701
  51. GRB050701: Swift-BAT Refined analysis
  52. GRB 050701: Swift XRT afterglow position
  53. Swift trigger 143708 is really GRB 050701
  54. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  55. GRB 050525A: Swift Late-Time Decay Rate
  56. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  57. Konus-Wind observation of an intermediate burst from SGR 1806-20
  58. GRB 050416(a): Host Galaxy Redshift Determination
  59. Swift/UVOT observations of GRB050607
  60. GRB 050607: RAPTOR-S Early Optical Limits
  61. GRB050607: KAIT optical limits
  62. GRB 050607: MDM Observations
  63. GRB050607,optical observation
  64. GRB 050607 - XRT refined data analysis
  65. GRB050607 optical limit by "Pi of the Sky"
  66. GRB050607: Swift Detection of a long GRB
  67. GRB 050603 - XRT data analysis of the first day
  68. Konus-Wind observation of GRB 050603
  69. GRB 050603: Analysis of UVOT data
  70. GRB050603: Fading Afterglow observed by Swift UVOT
  71. GRB 050603: Swift XRT Position
  72. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  73. Swift/BAT Detection of GRB050603
  74. GRB 050408: jet break in the XRT light curve
  75. GRB050528, XRT observations
  76. Correction to GCN Circ 3502 on GRB 050528
  77. Swift-BAT GRB 050528: a soft burst
  78. Update on Swift-BAT GRB 050528 (Trigger 130679)
  79. Possible GRB050528: no candidate from Liverpool Telescope
  80. Swift-BAT detection of possible GRB 050528
  81. GRB 050509b: refined XRT/Chandra afterglow position analysis
  82. GRB050525a: optical upper limits
  83. GRB 050525B: Swift-BAT observations
  84. GRB050525A,optical observation
  85. GRB050525: Super-LOTIS observations
  86. GRB 050525, spectral lag pseudo-redshift
  87. GRB050306: optical afterglow not confirmed
  88. GRB 050525A: BOOTES simultaneous optical observations
  89. GRB 050525A: Swift-BAT refined analysis
  90. Swift/UVOT UV and optical detections of GRB 050525
  91. Konus-Wind observation of GRB 050525
  92. GRB 050525: TAROT observations of the early afterglow
  93. INTEGRAL detection of GRB 050525
  94. GRB 050525: Optical observation
  95. GRB050525: ROTSE-III Refined Analysis
  96. GRB 050525 - Very Bright, Not Short
  97. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  98. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  99. XRF 050522: Swift XRT refined analysis
  100. Swift/UVOT observation of XRF 050522

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