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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"

26350 results found.

  1. GRB 050724: Swift/UVOT Upper Limit
  2. GRB050724: Refined analysis of the Swift-BAT possible short burst
  3. GRB 050724: possible host galaxy in DSS
  4. GRB 050721A: Swift-BAT refined analysis
  5. GRB 050721A: Early Swift XRT analysis results
  6. GRB050721A: optical decay
  7. GRB 050721: optical afterglow confirmed
  8. GRB 050709: Refined Spectral and Temporal Properties
  9. GRB050714b: Radio Observation
  10. GRB050712: Radio Observations
  11. GRB050713a: Radio Observation
  12. GRB 050712, Tautenburg optical afterglow observations
  13. Swift-BAT detection of a possible GRB
  14. GRB 050714B: VLT R-band observations
  15. GRB 050717: Additional LCO observations
  16. GRB 050716; J-band observations
  17. GRB 050717: LCO near-IR observations
  18. Swift/UVOT Observations of GRB 050717
  19. GRB 050717: Swift-BAT refined analysis
  20. GRB050717: Swift XRT position
  21. Swift detection of GRB 050717
  22. Swift UVOT Observations of GRB 050716
  23. GRB 050716: Refined XRT analysis.
  24. GRB050716: Refined analysis of the Swift-BAT burst
  25. GRB 050716: Lulin B and R band optical observations
  26. GRB050716, optical observation
  27. GRB050716: Faulkes North Telescope observation
  28. GRB050715: Refined analysis of the Swift-BAT burst
  29. GRB 050715: Swift-BAT detection
  30. GRB 050713b: RTT150 optical observations
  31. GRB050714B: Refined analysis of the Swift-BAT burst
  32. GRB 050714B: optical afterglow
  33. GRB 050714, R-band candidate
  34. GRB 050714, optical observations
  35. GRB 050713A: XRT refined analysis
  36. GRB 050713A: RAPTOR detection of early optical emission
  37. GRB050713B :Swift/UVOT observations
  38. GRB050713b: XRT refined analysis
  39. GRB050712: TNG R-band observations
  40. GRB 050713B: Swift-BAT Refined Analysis
  41. GRB 050713A: Swift/UVOT observation
  42. GRB 050713A : Swift-BAT Refined Analysis
  43. GRB050712: Swift UVOT Observation of Afterglow Emission
  44. GRB 050713A : Lulin R-band observation
  45. GRB 050713A XMM-Newton observation
  46. GRB 050713b : Lulin R-band observations
  47. GRB050713B: Faulkes North Telescope observation
  48. RBO RI observations of GRB 050713A
  49. GRB 050713B
  50. GRB050709 : Chandra source optical counterpart
  51. GRB050713: Liverpool Telescope prompt observations
  52. GRB 050712, optical observations
  53. GRB050709: Candidate X-ray Afterglow from Chandra
  54. GRB050713: possible I-band afterglow
  55. GRB050712: XRT refined analysis
  56. GRB050709: Radio Observations
  57. GRB 050709: Swift UVOT and XRT observations
  58. GRB 050712: Swift-BAT Refined Analysis
  59. GRB050712: UVOT candidate optical counterpart
  60. GRB 050709: LCO40 Observations
  61. GRB050709, optical observations
  62. PROMPT Rc Observations of GRB 050709
  63. GRB 050525a: PROMPT VRcIc Detections
  64. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  65. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  66. GRB 050626: Swift XRT observations
  67. GRB 050408: ARC 3.5-meter NIR Observations
  68. GRB 050701: Refined XRT analysis
  69. Swift UVOT observations of GRB 050701
  70. GRB050701: Swift-BAT Refined analysis
  71. Swift trigger 143708 is really GRB 050701
  72. GRB 050607, radio observations
  73. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  74. GRB050525a: HST Observations
  75. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  76. XRF 050509c: Optical monitoring
  77. Konus-Wind observation of an intermediate burst from SGR 1806-20
  78. XRF050509c: Radio Detection
  79. GRB 050607 optical decay
  80. GRB050607: refined analysis of prompt REM observations
  81. GRB 050607: PROMPT VRcIc Observations
  82. GRB 050607: Optical decay and spectral slope
  83. GRB050607,optical observation
  84. Optical Afterglow of GRB 050607
  85. GRB050607: Swift Detection of a long GRB
  86. GRB050607: prompt REM observations
  87. Limits on a SN in the field of GRB 050509b
  88. GRB 050603 - XRT data analysis of the first day
  89. GRB050603, submillimetre observations
  90. GRB050603: Radio Detection
  91. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  92. GRB 050603: INTEGRAL shows it is not a short GRB
  93. GRB 050525a, infrared observations
  94. GRB050528, XRT observations
  95. GRB050528: updated Liverpool Telescope limits
  96. Swift-BAT GRB 050528: a soft burst
  97. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  98. Possible GRB050528: no candidate from Liverpool Telescope
  99. GRB050525a: Radio Observations
  100. GRB 050509b: refined XRT/Chandra afterglow position analysis

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