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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"

18507 results found.

  1. GRB 050713A: XRT refined analysis
  2. GRB 050713A: RAPTOR detection of early optical emission
  3. GRB050713B :Swift/UVOT observations
  4. GRB050713b: XRT refined analysis
  5. GRB 050713B: Swift-BAT Refined Analysis
  6. Swift-BAT Trigger 145729 is not a GRB
  7. GRB 050713A: Swift/UVOT observation
  8. GRB 050713A : Swift-BAT Refined Analysis
  9. GRB050712: Swift UVOT Observation of Afterglow Emission
  10. GRB 050713A XMM-Newton observation
  11. GRB050713B: Faulkes North Telescope observation
  12. RBO RI observations of GRB 050713A
  13. GRB 050713B
  14. GRB050713: Liverpool Telescope prompt observations
  15. GRB050709: Candidate X-ray Afterglow from Chandra
  16. GRB 050713, R-band observations at NOT
  17. GRB 050713: Swift detection of Bright Burst
  18. GRB 050713A: ROTSE-III Optical Limits
  19. GRB050712: XRT refined analysis
  20. GRB 050709: Swift UVOT and XRT observations
  21. GRB 050712: Swift-BAT Refined Analysis
  22. GRB050712: UVOT candidate optical counterpart
  23. GRB 050712: Swift XRT afterglow position
  24. GRB 050712: Swift detection of a weak burst
  25. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  26. GRB 050626: Swift XRT observations
  27. GRB 050701
  28. GRB 050701, optical observations
  29. GRB 050701: Refined XRT analysis
  30. Swift UVOT observations of GRB 050701
  31. GRB050701: Swift-BAT Refined analysis
  32. GRB 050701: Swift XRT afterglow position
  33. Swift trigger 143708 is really GRB 050701
  34. GRB 050525A: Swift Late-Time Decay Rate
  35. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  36. GRB 050416(a): Host Galaxy Redshift Determination
  37. Swift/UVOT observations of GRB050607
  38. GRB 050607: RAPTOR-S Early Optical Limits
  39. GRB050607: KAIT optical limits
  40. GRB 050607: MDM Observations
  41. GRB050607,optical observation
  42. GRB 050607 - XRT refined data analysis
  43. GRB050607 optical limit by "Pi of the Sky"
  44. GRB050607: Swift Detection of a long GRB
  45. GRB 050603 - XRT data analysis of the first day
  46. Konus-Wind observation of GRB 050603
  47. GRB 050603: Analysis of UVOT data
  48. GRB050603: Fading Afterglow observed by Swift UVOT
  49. GRB 050603: Swift XRT Position
  50. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  51. Swift/BAT Detection of GRB050603
  52. GRB 050408: jet break in the XRT light curve
  53. GRB050528, XRT observations
  54. Correction to GCN Circ 3502 on GRB 050528
  55. Swift-BAT GRB 050528: a soft burst
  56. Update on Swift-BAT GRB 050528 (Trigger 130679)
  57. Possible GRB050528: no candidate from Liverpool Telescope
  58. Swift-BAT detection of possible GRB 050528
  59. GRB 050509b: refined XRT/Chandra afterglow position analysis
  60. GRB050525a: optical upper limits
  61. GRB 050525B: Swift-BAT observations
  62. GRB050525A,optical observation
  63. GRB050525: Super-LOTIS observations
  64. GRB 050525, spectral lag pseudo-redshift
  65. GRB050306: optical afterglow not confirmed
  66. GRB 050525A: BOOTES simultaneous optical observations
  67. GRB 050525A: Swift-BAT refined analysis
  68. Swift/UVOT UV and optical detections of GRB 050525
  69. Konus-Wind observation of GRB 050525
  70. GRB 050525: TAROT observations of the early afterglow
  71. INTEGRAL detection of GRB 050525
  72. GRB 050525: Optical observation
  73. GRB050525: ROTSE-III Refined Analysis
  74. GRB 050525 - Very Bright, Not Short
  75. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  76. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  77. XRF 050522: Swift XRT refined analysis
  78. Swift/UVOT observation of XRF 050522
  79. GRB 050509A: Further I-band imaging
  80. RBO Observations of GRB050522
  81. XRF 050522: Swift XRT observation
  82. GRB 050520: VLT/ULTRACAM observations
  83. Swift UVOT Observations of GRB 050520
  84. GRB 050520: Swift XRT refined analysis
  85. XRF050509C: Chandra Afterglow Detection
  86. XRF 050509c: Swift XRT Upper Limit
  87. RBO Observations of GRB050520
  88. GRB 050520: TAROT optical limit
  89. GRB 050520: Swift XRT position
  90. No Swift-BAT Lightcurves in real-time for next 3 weeks
  91. Swift-BAT trigger 122203 is not a real GRB
  92. GRB 050504: Swift XRT afterglow candidate has faded
  93. GRB 050509B: Subaru Optical Observations
  94. GRB050502b: Early Observation
  95. Refined Chandra analysis of GRB 050509b
  96. GRB050509b, SDSS pre-burst observations
  97. Chandra observation of GRB 050509b
  98. GRB 050509b: RAPTOR deep, early limits.
  99. GRB050509B: Optical/Infared observations
  100. GRB 050509b: Swift/UVOT follow-up measurements

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