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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"

19530 results found.

  1. Konus-Wind observation of GRB 050717
  2. Swift/UVOT Observations of GRB 050717
  3. GRB 050717: Swift-BAT refined analysis
  4. GRB 050717: Refined XRT analysis.
  5. GRB050712: optical limits
  6. GRB050717: Swift XRT position
  7. Swift detection of GRB 050717
  8. GRB 050716 - UKIRT identification of candidate afterglow
  9. Swift UVOT Observations of GRB 050716
  10. GRB 050716: Refined XRT analysis.
  11. GRB050716: Refined analysis of the Swift-BAT burst
  12. GRB050716, optical observation
  13. GRB050716: Faulkes North Telescope observation
  14. GRB050716: Correction to sign in XRT coordinate
  15. Swift/BAT detection of GRB 050716
  16. GRB050715: Refined analysis of the Swift-BAT burst
  17. GRB 050715: Swift-BAT detection
  18. Swift UVOT Observations of GRB 050714B
  19. Konus-Wind observation of GRB 050713A
  20. GRB 050714B: refined XRT analysis
  21. GRB050714B: Refined analysis of the Swift-BAT burst
  22. Swift detection of a long transient (GRB 050714B?)
  23. GRB 050714: Swift XRT afterglow position
  24. GRB 050713A: XRT refined analysis
  25. GRB 050713A: RAPTOR detection of early optical emission
  26. GRB050713B :Swift/UVOT observations
  27. GRB050713b: XRT refined analysis
  28. GRB 050713B: Swift-BAT Refined Analysis
  29. Swift-BAT Trigger 145729 is not a GRB
  30. GRB 050713A: Swift/UVOT observation
  31. GRB 050713A : Swift-BAT Refined Analysis
  32. GRB050712: Swift UVOT Observation of Afterglow Emission
  33. GRB 050713A XMM-Newton observation
  34. GRB050713B: Faulkes North Telescope observation
  35. RBO RI observations of GRB 050713A
  36. GRB 050713B
  37. GRB050713: Liverpool Telescope prompt observations
  38. GRB050709: Candidate X-ray Afterglow from Chandra
  39. GRB 050713, R-band observations at NOT
  40. GRB 050713: Swift detection of Bright Burst
  41. GRB 050713A: ROTSE-III Optical Limits
  42. GRB050712: XRT refined analysis
  43. GRB 050709: Swift UVOT and XRT observations
  44. GRB 050712: Swift-BAT Refined Analysis
  45. GRB050712: UVOT candidate optical counterpart
  46. GRB 050712: Swift XRT afterglow position
  47. GRB 050712: Swift detection of a weak burst
  48. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  49. GRB 050626: Swift XRT observations
  50. GRB 050701
  51. GRB 050701, optical observations
  52. GRB 050701: Refined XRT analysis
  53. Swift UVOT observations of GRB 050701
  54. GRB050701: Swift-BAT Refined analysis
  55. GRB 050701: Swift XRT afterglow position
  56. Swift trigger 143708 is really GRB 050701
  57. GRB 050525A: Swift Late-Time Decay Rate
  58. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  59. GRB 050416(a): Host Galaxy Redshift Determination
  60. Swift/UVOT observations of GRB050607
  61. GRB 050607: RAPTOR-S Early Optical Limits
  62. GRB050607: KAIT optical limits
  63. GRB 050607: MDM Observations
  64. GRB050607,optical observation
  65. GRB 050607 - XRT refined data analysis
  66. GRB050607 optical limit by "Pi of the Sky"
  67. GRB050607: Swift Detection of a long GRB
  68. GRB 050603 - XRT data analysis of the first day
  69. Konus-Wind observation of GRB 050603
  70. GRB 050603: Analysis of UVOT data
  71. GRB050603: Fading Afterglow observed by Swift UVOT
  72. GRB 050603: Swift XRT Position
  73. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  74. Swift/BAT Detection of GRB050603
  75. GRB 050408: jet break in the XRT light curve
  76. GRB050528, XRT observations
  77. Correction to GCN Circ 3502 on GRB 050528
  78. Swift-BAT GRB 050528: a soft burst
  79. Update on Swift-BAT GRB 050528 (Trigger 130679)
  80. Possible GRB050528: no candidate from Liverpool Telescope
  81. Swift-BAT detection of possible GRB 050528
  82. GRB 050509b: refined XRT/Chandra afterglow position analysis
  83. GRB050525a: optical upper limits
  84. GRB 050525B: Swift-BAT observations
  85. GRB050525A,optical observation
  86. GRB050525: Super-LOTIS observations
  87. GRB 050525, spectral lag pseudo-redshift
  88. GRB050306: optical afterglow not confirmed
  89. GRB 050525A: BOOTES simultaneous optical observations
  90. GRB 050525A: Swift-BAT refined analysis
  91. Swift/UVOT UV and optical detections of GRB 050525
  92. Konus-Wind observation of GRB 050525
  93. GRB 050525: TAROT observations of the early afterglow
  94. INTEGRAL detection of GRB 050525
  95. GRB 050525: Optical observation
  96. GRB050525: ROTSE-III Refined Analysis
  97. GRB 050525 - Very Bright, Not Short
  98. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  99. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  100. XRF 050522: Swift XRT refined analysis

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