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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.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

19352 results found.

  1. GRB 050727: RTT150 optical observations
  2. GRB050727: KAIT optical limit
  3. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  4. GRB 050726: early Swift XRT analysis results
  5. GRB050726: Swift-BAT detection of a weak burst
  6. GRB 050724: SWIFT XRT refined position
  7. GRB 050724: optical and near-IR observations
  8. GRB 050724: Swift/UVOT Upper Limit
  9. GRB 050724: early Swift XRT analysis results
  10. GRB050724: Refined analysis of the Swift-BAT possible short burst
  11. GRB050724: a short-burst detected by Swift
  12. Swift-BAT trigger 147325 is not due to a real GRB
  13. GRB050723: XRT distributed coordinates are not related to the burst
  14. GRB 050721A: Swift-BAT refined analysis
  15. GRB 050721A: Early Swift XRT analysis results
  16. Swift BAT Trigger 146986 is SWIFT J1753.5-0127
  17. GRB 050721a: Optical Observations
  18. GRB050721A: Swift-BAT detection of a weak burst
  19. GRB 050714a: Refined XRT analysis and afterglow confirmation
  20. Swift-BAT trigger 146731 is not a real GRB
  21. Swift-BAT detection of a possible GRB
  22. GRB050717
  23. Konus-Wind observation of GRB 050717
  24. Swift/UVOT Observations of GRB 050717
  25. GRB 050717: Swift-BAT refined analysis
  26. GRB 050717: Refined XRT analysis.
  27. GRB050712: optical limits
  28. GRB050717: Swift XRT position
  29. Swift detection of GRB 050717
  30. GRB 050716 - UKIRT identification of candidate afterglow
  31. Swift UVOT Observations of GRB 050716
  32. GRB 050716: Refined XRT analysis.
  33. GRB050716: Refined analysis of the Swift-BAT burst
  34. GRB050716, optical observation
  35. GRB050716: Faulkes North Telescope observation
  36. GRB050716: Correction to sign in XRT coordinate
  37. Swift/BAT detection of GRB 050716
  38. GRB050715: Refined analysis of the Swift-BAT burst
  39. GRB 050715: Swift-BAT detection
  40. Swift UVOT Observations of GRB 050714B
  41. Konus-Wind observation of GRB 050713A
  42. GRB 050714B: refined XRT analysis
  43. GRB050714B: Refined analysis of the Swift-BAT burst
  44. Swift detection of a long transient (GRB 050714B?)
  45. GRB 050714: Swift XRT afterglow position
  46. GRB 050713A: XRT refined analysis
  47. GRB 050713A: RAPTOR detection of early optical emission
  48. GRB050713B :Swift/UVOT observations
  49. GRB050713b: XRT refined analysis
  50. GRB 050713B: Swift-BAT Refined Analysis
  51. Swift-BAT Trigger 145729 is not a GRB
  52. GRB 050713A: Swift/UVOT observation
  53. GRB 050713A : Swift-BAT Refined Analysis
  54. GRB050712: Swift UVOT Observation of Afterglow Emission
  55. GRB 050713A XMM-Newton observation
  56. GRB050713B: Faulkes North Telescope observation
  57. RBO RI observations of GRB 050713A
  58. GRB 050713B
  59. GRB050713: Liverpool Telescope prompt observations
  60. GRB050709: Candidate X-ray Afterglow from Chandra
  61. GRB 050713, R-band observations at NOT
  62. GRB 050713: Swift detection of Bright Burst
  63. GRB 050713A: ROTSE-III Optical Limits
  64. GRB050712: XRT refined analysis
  65. GRB 050709: Swift UVOT and XRT observations
  66. GRB 050712: Swift-BAT Refined Analysis
  67. GRB050712: UVOT candidate optical counterpart
  68. GRB 050712: Swift XRT afterglow position
  69. GRB 050712: Swift detection of a weak burst
  70. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  71. GRB 050626: Swift XRT observations
  72. GRB 050701
  73. GRB 050701, optical observations
  74. GRB 050701: Refined XRT analysis
  75. Swift UVOT observations of GRB 050701
  76. GRB050701: Swift-BAT Refined analysis
  77. GRB 050701: Swift XRT afterglow position
  78. Swift trigger 143708 is really GRB 050701
  79. GRB 050525A: Swift Late-Time Decay Rate
  80. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  81. GRB 050416(a): Host Galaxy Redshift Determination
  82. Swift/UVOT observations of GRB050607
  83. GRB 050607: RAPTOR-S Early Optical Limits
  84. GRB050607: KAIT optical limits
  85. GRB 050607: MDM Observations
  86. GRB050607,optical observation
  87. GRB 050607 - XRT refined data analysis
  88. GRB050607 optical limit by "Pi of the Sky"
  89. GRB050607: Swift Detection of a long GRB
  90. GRB 050603 - XRT data analysis of the first day
  91. Konus-Wind observation of GRB 050603
  92. GRB 050603: Analysis of UVOT data
  93. GRB050603: Fading Afterglow observed by Swift UVOT
  94. GRB 050603: Swift XRT Position
  95. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  96. Swift/BAT Detection of GRB050603
  97. GRB 050408: jet break in the XRT light curve
  98. GRB050528, XRT observations
  99. Correction to GCN Circ 3502 on GRB 050528
  100. Swift-BAT GRB 050528: a soft burst

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