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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"

21392 results found.

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

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