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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"

43674 results found.

  1. GRB050714b: Radio Observation
  2. GRB050712: Radio Observations
  3. GRB 050714a: Refined XRT analysis and afterglow confirmation
  4. GRB050713a: Radio Observation
  5. Swift-BAT trigger 146731 is not a real GRB
  6. GRB 050712, Tautenburg optical afterglow observations
  7. Swift-BAT detection of a possible GRB
  8. GRB 050717: Additional LCO observations
  9. GRB 050716; J-band observations
  10. Konus-Wind observation of GRB 050717
  11. GRB 050717: LCO near-IR observations
  12. Swift/UVOT Observations of GRB 050717
  13. GRB 050717: Swift-BAT refined analysis
  14. GRB 050717: Refined XRT analysis.
  15. GRB050717: Swift XRT position
  16. Swift detection of GRB 050717
  17. GRB 050716 - UKIRT identification of candidate afterglow
  18. Swift UVOT Observations of GRB 050716
  19. GRB 050716: Refined XRT analysis.
  20. GRB050716: Refined analysis of the Swift-BAT burst
  21. GRB 050716: Lulin B and R band optical observations
  22. GRB050716: Faulkes North Telescope observation
  23. GRB050716: Correction to sign in XRT coordinate
  24. Swift/BAT detection of GRB 050716
  25. GRB050715: Refined analysis of the Swift-BAT burst
  26. GRB 050715: Swift-BAT detection
  27. Swift UVOT Observations of GRB 050714B
  28. Konus-Wind observation of GRB 050713A
  29. GRB 050714B: refined XRT analysis
  30. GRB 050713b: RTT150 optical observations
  31. GRB 050714B: candidate afterglow does not fade
  32. GRB050714B: Refined analysis of the Swift-BAT burst
  33. GRB 050714B: optical afterglow
  34. Swift detection of a long transient (GRB 050714B?)
  35. GRB 050709: optical afterglow candidate
  36. GRB 050714, R-band candidate
  37. GRB 050714: Swift XRT afterglow position
  38. GRB 050714, optical observations
  39. GRB 050714A: ROTSE-III Optical Limits
  40. GRB 050714 - A long GRB detected with INTEGRAL
  41. GRB 050713A: XRT refined analysis
  42. GRB 050709: Spectroscopy
  43. GRB 050713A: RAPTOR detection of early optical emission
  44. GRB050713B :Swift/UVOT observations
  45. GRB050713b: XRT refined analysis
  46. GRB050712: TNG R-band observations
  47. GRB 050713B: Swift-BAT Refined Analysis
  48. Swift-BAT Trigger 145729 is not a GRB
  49. GRB 050713A: Swift/UVOT observation
  50. GRB 050713A : Swift-BAT Refined Analysis
  51. GRB050712: Swift UVOT Observation of Afterglow Emission
  52. GRB 050713A XMM-Newton observation
  53. GRB 050713b : Lulin R-band observations
  54. GRB050713B: Faulkes North Telescope observation
  55. RBO RI observations of GRB 050713A
  56. GRB 050713B
  57. GRB050709 : Chandra source optical counterpart
  58. GRB050713: Liverpool Telescope prompt observations
  59. GRB 050712, optical observations
  60. GRB050709: Candidate X-ray Afterglow from Chandra
  61. GRB 050713, R-band observations at NOT
  62. GRB050713: possible I-band afterglow
  63. GRB 050713: Swift detection of Bright Burst
  64. GRB 050713A: ROTSE-III Optical Limits
  65. GRB050712: XRT refined analysis
  66. GRB050709: Radio Observations
  67. GRB 050709: Swift UVOT and XRT observations
  68. GRB 050712: Swift-BAT Refined Analysis
  69. GRB050712: UVOT candidate optical counterpart
  70. GRB 050712: Swift XRT afterglow position
  71. GRB 050712: Swift detection of a weak burst
  72. GRB 050709: LCO40 Observations
  73. GRB050709, optical observations
  74. GRB050709: A Possible Short-Hard GRB Localized by HETE
  75. PROMPT Rc Observations of GRB 050709
  76. GRB 050525a: PROMPT VRcIc Detections
  77. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  78. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  79. GRB 050626 optical observations
  80. GRB 050626: Swift XRT observations
  81. GRB 050701, optical observations
  82. GRB 050408: ARC 3.5-meter NIR Observations
  83. GRB 050701: Refined XRT analysis
  84. Swift UVOT observations of GRB 050701
  85. GRB050701: Swift-BAT Refined analysis
  86. GRB 050701: Swift XRT afterglow position
  87. Swift trigger 143708 is really GRB 050701
  88. GRB 050607, radio observations
  89. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  90. GRB 050626 - a long GRB detected with INTEGRAL
  91. GRB 050525A: Swift Late-Time Decay Rate
  92. GRB050525a: HST Observations
  93. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  94. H3804: A Possible New XRB Detected by HETE
  95. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  96. XRF 050509c: Optical monitoring
  97. Konus-Wind observation of an intermediate burst from SGR 1806-20
  98. IBAS Alert #2512 is NOT a GRB
  99. XRF050509c: Radio Detection
  100. GRB 050416(a): Host Galaxy Redshift Determination

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