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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"

28045 results found.

  1. GRB050721A: optical decay
  2. GRB 050721: optical afterglow confirmed
  3. GRB 050709: Refined Spectral and Temporal Properties
  4. GRB050714b: Radio Observation
  5. GRB050712: Radio Observations
  6. GRB050713a: Radio Observation
  7. GRB 050712, Tautenburg optical afterglow observations
  8. Swift-BAT detection of a possible GRB
  9. GRB 050714B: VLT R-band observations
  10. GRB 050717: Additional LCO observations
  11. GRB 050716; J-band observations
  12. GRB 050717: LCO near-IR observations
  13. Swift/UVOT Observations of GRB 050717
  14. GRB 050717: Swift-BAT refined analysis
  15. GRB050717: Swift XRT position
  16. Swift detection of GRB 050717
  17. Swift UVOT Observations of GRB 050716
  18. GRB 050716: Refined XRT analysis.
  19. GRB050716: Refined analysis of the Swift-BAT burst
  20. GRB 050716: Lulin B and R band optical observations
  21. GRB050716, optical observation
  22. GRB050716: Faulkes North Telescope observation
  23. GRB050715: Refined analysis of the Swift-BAT burst
  24. GRB 050715: Swift-BAT detection
  25. GRB 050713b: RTT150 optical observations
  26. GRB050714B: Refined analysis of the Swift-BAT burst
  27. GRB 050714B: optical afterglow
  28. GRB 050714, R-band candidate
  29. GRB 050714, optical observations
  30. GRB 050713A: XRT refined analysis
  31. GRB 050713A: RAPTOR detection of early optical emission
  32. GRB050713B :Swift/UVOT observations
  33. GRB050713b: XRT refined analysis
  34. GRB050712: TNG R-band observations
  35. GRB 050713B: Swift-BAT Refined Analysis
  36. GRB 050713A: Swift/UVOT observation
  37. GRB 050713A : Swift-BAT Refined Analysis
  38. GRB050712: Swift UVOT Observation of Afterglow Emission
  39. GRB 050713A : Lulin R-band observation
  40. GRB 050713A XMM-Newton observation
  41. GRB 050713b : Lulin R-band observations
  42. GRB050713B: Faulkes North Telescope observation
  43. RBO RI observations of GRB 050713A
  44. GRB 050713B
  45. GRB050709 : Chandra source optical counterpart
  46. GRB050713: Liverpool Telescope prompt observations
  47. GRB 050712, optical observations
  48. GRB050709: Candidate X-ray Afterglow from Chandra
  49. GRB050713: possible I-band afterglow
  50. GRB050712: XRT refined analysis
  51. GRB050709: Radio Observations
  52. GRB 050709: Swift UVOT and XRT observations
  53. GRB 050712: Swift-BAT Refined Analysis
  54. GRB050712: UVOT candidate optical counterpart
  55. GRB 050709: LCO40 Observations
  56. GRB050709, optical observations
  57. PROMPT Rc Observations of GRB 050709
  58. GRB 050525a: PROMPT VRcIc Detections
  59. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  60. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  61. GRB 050626: Swift XRT observations
  62. GRB 050408: ARC 3.5-meter NIR Observations
  63. GRB 050701: Refined XRT analysis
  64. Swift UVOT observations of GRB 050701
  65. GRB050701: Swift-BAT Refined analysis
  66. Swift trigger 143708 is really GRB 050701
  67. GRB 050607, radio observations
  68. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  69. GRB050525a: HST Observations
  70. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  71. XRF 050509c: Optical monitoring
  72. Konus-Wind observation of an intermediate burst from SGR 1806-20
  73. XRF050509c: Radio Detection
  74. GRB 050607 optical decay
  75. GRB050607: refined analysis of prompt REM observations
  76. GRB 050607: PROMPT VRcIc Observations
  77. GRB 050607: Optical decay and spectral slope
  78. GRB050607,optical observation
  79. Optical Afterglow of GRB 050607
  80. GRB050607: Swift Detection of a long GRB
  81. GRB050607: prompt REM observations
  82. Limits on a SN in the field of GRB 050509b
  83. GRB 050603 - XRT data analysis of the first day
  84. GRB050603, submillimetre observations
  85. GRB050603: Radio Detection
  86. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  87. GRB 050603: INTEGRAL shows it is not a short GRB
  88. GRB 050525a, infrared observations
  89. GRB050528, XRT observations
  90. GRB050528: updated Liverpool Telescope limits
  91. Swift-BAT GRB 050528: a soft burst
  92. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  93. Possible GRB050528: no candidate from Liverpool Telescope
  94. GRB050525a: Radio Observations
  95. GRB 050509b: refined XRT/Chandra afterglow position analysis
  96. GRB 050525: RTT150, Optical observations
  97. GRB 050525a: SARA Observations
  98. GRB 050525B: Swift-BAT observations
  99. GRB 050525: MITSuME Optical Observation in VRI
  100. GRB050525A,optical observation

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