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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"

28062 results found.

  1. GRB 050724: Secure Host Redshift from Keck
  2. GRB 050724: WHT optical observations
  3. GRB050713: analysis of the XMM-Newton observation
  4. Swift-BAT trigger 147918 is not a real GRB
  5. GRB050724: VLT observations of the variable source
  6. GRB050709: Second Epoch Chandra Observation
  7. GRB050726: Swift-BAT detection of a weak burst
  8. GRB 050724: Optical Variability in Nearby Galaxy
  9. GRB 050724: J-band observations
  10. GRB 050724: GMOS Imaging and Spectroscopy
  11. GRB050724: Radio Observation
  12. GRB 050724: Optical imaging/astrometry
  13. GRB 050724: Swift/UVOT Upper Limit
  14. GRB050724: Refined analysis of the Swift-BAT possible short burst
  15. GRB 050724: possible host galaxy in DSS
  16. GRB 050721A: Swift-BAT refined analysis
  17. GRB 050721A: Early Swift XRT analysis results
  18. GRB050721A: optical decay
  19. GRB 050721: optical afterglow confirmed
  20. GRB 050709: Refined Spectral and Temporal Properties
  21. GRB050714b: Radio Observation
  22. GRB050712: Radio Observations
  23. GRB050713a: Radio Observation
  24. GRB 050712, Tautenburg optical afterglow observations
  25. Swift-BAT detection of a possible GRB
  26. GRB 050714B: VLT R-band observations
  27. GRB 050717: Additional LCO observations
  28. GRB 050716; J-band observations
  29. GRB 050717: LCO near-IR observations
  30. Swift/UVOT Observations of GRB 050717
  31. GRB 050717: Swift-BAT refined analysis
  32. GRB050717: Swift XRT position
  33. Swift detection of GRB 050717
  34. Swift UVOT Observations of GRB 050716
  35. GRB 050716: Refined XRT analysis.
  36. GRB050716: Refined analysis of the Swift-BAT burst
  37. GRB 050716: Lulin B and R band optical observations
  38. GRB050716, optical observation
  39. GRB050716: Faulkes North Telescope observation
  40. GRB050715: Refined analysis of the Swift-BAT burst
  41. GRB 050715: Swift-BAT detection
  42. GRB 050713b: RTT150 optical observations
  43. GRB050714B: Refined analysis of the Swift-BAT burst
  44. GRB 050714B: optical afterglow
  45. GRB 050714, R-band candidate
  46. GRB 050714, optical observations
  47. GRB 050713A: XRT refined analysis
  48. GRB 050713A: RAPTOR detection of early optical emission
  49. GRB050713B :Swift/UVOT observations
  50. GRB050713b: XRT refined analysis
  51. GRB050712: TNG R-band observations
  52. GRB 050713B: Swift-BAT Refined Analysis
  53. GRB 050713A: Swift/UVOT observation
  54. GRB 050713A : Swift-BAT Refined Analysis
  55. GRB050712: Swift UVOT Observation of Afterglow Emission
  56. GRB 050713A : Lulin R-band observation
  57. GRB 050713A XMM-Newton observation
  58. GRB 050713b : Lulin R-band observations
  59. GRB050713B: Faulkes North Telescope observation
  60. RBO RI observations of GRB 050713A
  61. GRB 050713B
  62. GRB050709 : Chandra source optical counterpart
  63. GRB050713: Liverpool Telescope prompt observations
  64. GRB 050712, optical observations
  65. GRB050709: Candidate X-ray Afterglow from Chandra
  66. GRB050713: possible I-band afterglow
  67. GRB050712: XRT refined analysis
  68. GRB050709: Radio Observations
  69. GRB 050709: Swift UVOT and XRT observations
  70. GRB 050712: Swift-BAT Refined Analysis
  71. GRB050712: UVOT candidate optical counterpart
  72. GRB 050709: LCO40 Observations
  73. GRB050709, optical observations
  74. PROMPT Rc Observations of GRB 050709
  75. GRB 050525a: PROMPT VRcIc Detections
  76. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  77. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  78. GRB 050626: Swift XRT observations
  79. GRB 050408: ARC 3.5-meter NIR Observations
  80. GRB 050701: Refined XRT analysis
  81. Swift UVOT observations of GRB 050701
  82. GRB050701: Swift-BAT Refined analysis
  83. Swift trigger 143708 is really GRB 050701
  84. GRB 050607, radio observations
  85. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  86. GRB050525a: HST Observations
  87. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  88. XRF 050509c: Optical monitoring
  89. Konus-Wind observation of an intermediate burst from SGR 1806-20
  90. XRF050509c: Radio Detection
  91. GRB 050607 optical decay
  92. GRB050607: refined analysis of prompt REM observations
  93. GRB 050607: PROMPT VRcIc Observations
  94. GRB 050607: Optical decay and spectral slope
  95. GRB050607,optical observation
  96. Optical Afterglow of GRB 050607
  97. GRB050607: Swift Detection of a long GRB
  98. GRB050607: prompt REM observations
  99. Limits on a SN in the field of GRB 050509b
  100. GRB 050603 - XRT data analysis of the first day

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