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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"

26033 results found.

  1. GRB 050713A: XRT refined analysis
  2. GRB 050709: Spectroscopy
  3. GRB 050713A: RAPTOR detection of early optical emission
  4. GRB050713B :Swift/UVOT observations
  5. GRB050713b: XRT refined analysis
  6. GRB050712: TNG R-band observations
  7. GRB 050713B: Swift-BAT Refined Analysis
  8. Swift-BAT Trigger 145729 is not a GRB
  9. GRB 050713A: Swift/UVOT observation
  10. GRB 050713A : Swift-BAT Refined Analysis
  11. GRB050712: Swift UVOT Observation of Afterglow Emission
  12. GRB 050713A : Lulin R-band observation
  13. GRB 050713A XMM-Newton observation
  14. GRB050713B: Faulkes North Telescope observation
  15. RBO RI observations of GRB 050713A
  16. GRB 050713B
  17. GRB050713: Liverpool Telescope prompt observations
  18. GRB050709: Candidate X-ray Afterglow from Chandra
  19. GRB 050713, R-band observations at NOT
  20. GRB050713: possible I-band afterglow
  21. GRB 050713: Swift detection of Bright Burst
  22. GRB 050713A: ROTSE-III Optical Limits
  23. GRB050712: XRT refined analysis
  24. GRB 050709: Swift UVOT and XRT observations
  25. GRB 050712: Swift-BAT Refined Analysis
  26. GRB050712: UVOT candidate optical counterpart
  27. GRB 050712: Swift XRT afterglow position
  28. GRB 050712: Swift detection of a weak burst
  29. GRB050709: A Possible Short-Hard GRB Localized by HETE
  30. GRB 050525a: PROMPT VRcIc Detections
  31. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  32. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  33. GRB 050626 optical observations
  34. GRB 050626: Swift XRT observations
  35. GRB 050701
  36. GRB 050701, optical observations
  37. GRB 050408: ARC 3.5-meter NIR Observations
  38. GRB 050701: Refined XRT analysis
  39. Swift UVOT observations of GRB 050701
  40. GRB050701: Swift-BAT Refined analysis
  41. GRB 050701: Swift XRT afterglow position
  42. Swift trigger 143708 is really GRB 050701
  43. GRB 050607, radio observations
  44. GRB 050525A: Swift Late-Time Decay Rate
  45. GRB050525a: HST Observations
  46. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  47. XRF 050509c: Optical monitoring
  48. XRF050509c: Radio Detection
  49. GRB 050416(a): Host Galaxy Redshift Determination
  50. GRB 050607: MDM Observation
  51. GRB 050607 optical decay
  52. Swift/UVOT observations of GRB050607
  53. GRB 050607 : Lulin R-band observation
  54. GRB 050607: PROMPT VRcIc Observations
  55. GRB 050607: RAPTOR-S Early Optical Limits
  56. GRB050607: KAIT optical limits
  57. GRB 050525a, Mid-Infrared Observations
  58. GRB 050607: Optical decay and spectral slope
  59. GRB 050607: MDM Observations
  60. GRB050607,optical observation
  61. GRB 050607 - XRT refined data analysis
  62. Optical Afterglow of GRB 050607
  63. GRB050607 optical limit by "Pi of the Sky"
  64. GRB050607: Swift Detection of a long GRB
  65. Limits on a SN in the field of GRB 050509b
  66. GRB 050603: Redshift
  67. GRB 050603 - XRT data analysis of the first day
  68. Konus-Wind observation of GRB 050603
  69. GRB 050603: Analysis of UVOT data
  70. GRB050603: Fading Afterglow observed by Swift UVOT
  71. GRB050603, submillimetre observations
  72. GRB 050603: Swift XRT Position
  73. GRB050603: Radio Detection
  74. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  75. GRB 050603: Afterglow Identification from LCO
  76. Swift/BAT Detection of GRB050603
  77. GRB 050408: jet break in the XRT light curve
  78. GRB 050525a, infrared observations
  79. GRB 050525a, SMARTS optical/IR afterglow observations
  80. GRB050528, XRT observations
  81. Correction to GCN Circ 3502 on GRB 050528
  82. Swift-BAT GRB 050528: a soft burst
  83. Update on Swift-BAT GRB 050528 (Trigger 130679)
  84. Possible GRB050528: no candidate from Liverpool Telescope
  85. Swift-BAT detection of possible GRB 050528
  86. GRB 050509b: refined XRT/Chandra afterglow position analysis
  87. GRB050525a: optical upper limits
  88. GRB 050525a: SARA Observations
  89. GRB 050525B: Swift-BAT observations
  90. GRB 050525: MITSuME Optical Observation in VRI
  91. GRB 050525a: MDM Observations
  92. GRB050525A,optical observation
  93. GRB 050525 : Lulin optical afterglow observations
  94. GRB050525: Super-LOTIS observations
  95. GRB 050525, spectral lag pseudo-redshift
  96. GRB050306: optical afterglow not confirmed
  97. GRB 050525A: BOOTES simultaneous optical observations
  98. GRB 050525A: Swift-BAT refined analysis
  99. GRB050525: Optical observations
  100. Swift/UVOT UV and optical detections of GRB 050525

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