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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"

19594 results found.

  1. GRB050713: Liverpool Telescope prompt observations
  2. GRB050709: Candidate X-ray Afterglow from Chandra
  3. GRB 050713, R-band observations at NOT
  4. GRB 050713: Swift detection of Bright Burst
  5. GRB 050713A: ROTSE-III Optical Limits
  6. GRB050712: XRT refined analysis
  7. GRB 050709: Swift UVOT and XRT observations
  8. GRB 050712: Swift-BAT Refined Analysis
  9. GRB050712: UVOT candidate optical counterpart
  10. GRB 050712: Swift XRT afterglow position
  11. GRB 050712: Swift detection of a weak burst
  12. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  13. GRB 050626: Swift XRT observations
  14. GRB 050701
  15. GRB 050701, optical observations
  16. GRB 050701: Refined XRT analysis
  17. Swift UVOT observations of GRB 050701
  18. GRB050701: Swift-BAT Refined analysis
  19. GRB 050701: Swift XRT afterglow position
  20. Swift trigger 143708 is really GRB 050701
  21. GRB 050525A: Swift Late-Time Decay Rate
  22. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  23. GRB 050416(a): Host Galaxy Redshift Determination
  24. Swift/UVOT observations of GRB050607
  25. GRB 050607: RAPTOR-S Early Optical Limits
  26. GRB050607: KAIT optical limits
  27. GRB 050607: MDM Observations
  28. GRB050607,optical observation
  29. GRB 050607 - XRT refined data analysis
  30. GRB050607 optical limit by "Pi of the Sky"
  31. GRB050607: Swift Detection of a long GRB
  32. GRB 050603 - XRT data analysis of the first day
  33. Konus-Wind observation of GRB 050603
  34. GRB 050603: Analysis of UVOT data
  35. GRB050603: Fading Afterglow observed by Swift UVOT
  36. GRB 050603: Swift XRT Position
  37. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  38. Swift/BAT Detection of GRB050603
  39. GRB 050408: jet break in the XRT light curve
  40. GRB050528, XRT observations
  41. Correction to GCN Circ 3502 on GRB 050528
  42. Swift-BAT GRB 050528: a soft burst
  43. Update on Swift-BAT GRB 050528 (Trigger 130679)
  44. Possible GRB050528: no candidate from Liverpool Telescope
  45. Swift-BAT detection of possible GRB 050528
  46. GRB 050509b: refined XRT/Chandra afterglow position analysis
  47. GRB050525a: optical upper limits
  48. GRB 050525B: Swift-BAT observations
  49. GRB050525A,optical observation
  50. GRB050525: Super-LOTIS observations
  51. GRB 050525, spectral lag pseudo-redshift
  52. GRB050306: optical afterglow not confirmed
  53. GRB 050525A: BOOTES simultaneous optical observations
  54. GRB 050525A: Swift-BAT refined analysis
  55. Swift/UVOT UV and optical detections of GRB 050525
  56. Konus-Wind observation of GRB 050525
  57. GRB 050525: TAROT observations of the early afterglow
  58. INTEGRAL detection of GRB 050525
  59. GRB 050525: Optical observation
  60. GRB050525: ROTSE-III Refined Analysis
  61. GRB 050525 - Very Bright, Not Short
  62. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  63. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  64. XRF 050522: Swift XRT refined analysis
  65. Swift/UVOT observation of XRF 050522
  66. GRB 050509A: Further I-band imaging
  67. RBO Observations of GRB050522
  68. XRF 050522: Swift XRT observation
  69. GRB 050520: VLT/ULTRACAM observations
  70. Swift UVOT Observations of GRB 050520
  71. GRB 050520: Swift XRT refined analysis
  72. XRF050509C: Chandra Afterglow Detection
  73. XRF 050509c: Swift XRT Upper Limit
  74. RBO Observations of GRB050520
  75. GRB 050520: TAROT optical limit
  76. GRB 050520: Swift XRT position
  77. No Swift-BAT Lightcurves in real-time for next 3 weeks
  78. Swift-BAT trigger 122203 is not a real GRB
  79. GRB 050504: Swift XRT afterglow candidate has faded
  80. GRB 050509B: Subaru Optical Observations
  81. GRB050502b: Early Observation
  82. Refined Chandra analysis of GRB 050509b
  83. GRB050509b, SDSS pre-burst observations
  84. Chandra observation of GRB 050509b
  85. GRB 050509b: RAPTOR deep, early limits.
  86. GRB050509B: Optical/Infared observations
  87. GRB 050509b: Swift/UVOT follow-up measurements
  88. GRB 050509b Milagro GeV/TeV Observations
  89. GRB050509B: Optical observations at the Very Large Telescope
  90. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  91. GRB 050509a: Swift-BAT refined analysis
  92. GRB 050509B: WSRT Radio Observations
  93. GRB 050505: SARA Observations
  94. Swift UVOT Follow-up Observations of GRB 050509B
  95. GRB 050509B, Optical Observations
  96. GRB 050509B: Swift/XRT refined analysis
  97. GRB050509a: Swift UVOT observations
  98. GRB 050509b: Optical observations
  99. GRB 050509b: Possible Optical Counterpart
  100. GRB 050509A: Optical observations

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