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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"

26038 results found.

  1. GRB050714B: Refined analysis of the Swift-BAT burst
  2. GRB 050714B: optical afterglow
  3. Swift detection of a long transient (GRB 050714B?)
  4. GRB 050709: optical afterglow candidate
  5. GRB 050714: Swift XRT afterglow position
  6. GRB 050713A: XRT refined analysis
  7. GRB 050709: Spectroscopy
  8. GRB 050713A: RAPTOR detection of early optical emission
  9. GRB050713B :Swift/UVOT observations
  10. GRB050713b: XRT refined analysis
  11. GRB050712: TNG R-band observations
  12. GRB 050713B: Swift-BAT Refined Analysis
  13. Swift-BAT Trigger 145729 is not a GRB
  14. GRB 050713A: Swift/UVOT observation
  15. GRB 050713A : Swift-BAT Refined Analysis
  16. GRB050712: Swift UVOT Observation of Afterglow Emission
  17. GRB 050713A : Lulin R-band observation
  18. GRB 050713A XMM-Newton observation
  19. GRB050713B: Faulkes North Telescope observation
  20. RBO RI observations of GRB 050713A
  21. GRB 050713B
  22. GRB050713: Liverpool Telescope prompt observations
  23. GRB050709: Candidate X-ray Afterglow from Chandra
  24. GRB 050713, R-band observations at NOT
  25. GRB050713: possible I-band afterglow
  26. GRB 050713: Swift detection of Bright Burst
  27. GRB 050713A: ROTSE-III Optical Limits
  28. GRB050712: XRT refined analysis
  29. GRB 050709: Swift UVOT and XRT observations
  30. GRB 050712: Swift-BAT Refined Analysis
  31. GRB050712: UVOT candidate optical counterpart
  32. GRB 050712: Swift XRT afterglow position
  33. GRB 050712: Swift detection of a weak burst
  34. GRB050709: A Possible Short-Hard GRB Localized by HETE
  35. GRB 050525a: PROMPT VRcIc Detections
  36. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  37. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  38. GRB 050626 optical observations
  39. GRB 050626: Swift XRT observations
  40. GRB 050701
  41. GRB 050701, optical observations
  42. GRB 050408: ARC 3.5-meter NIR Observations
  43. GRB 050701: Refined XRT analysis
  44. Swift UVOT observations of GRB 050701
  45. GRB050701: Swift-BAT Refined analysis
  46. GRB 050701: Swift XRT afterglow position
  47. Swift trigger 143708 is really GRB 050701
  48. GRB 050607, radio observations
  49. GRB 050525A: Swift Late-Time Decay Rate
  50. GRB050525a: HST Observations
  51. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  52. XRF 050509c: Optical monitoring
  53. XRF050509c: Radio Detection
  54. GRB 050416(a): Host Galaxy Redshift Determination
  55. GRB 050607: MDM Observation
  56. GRB 050607 optical decay
  57. Swift/UVOT observations of GRB050607
  58. GRB 050607 : Lulin R-band observation
  59. GRB 050607: PROMPT VRcIc Observations
  60. GRB 050607: RAPTOR-S Early Optical Limits
  61. GRB050607: KAIT optical limits
  62. GRB 050525a, Mid-Infrared Observations
  63. GRB 050607: Optical decay and spectral slope
  64. GRB 050607: MDM Observations
  65. GRB050607,optical observation
  66. GRB 050607 - XRT refined data analysis
  67. Optical Afterglow of GRB 050607
  68. GRB050607 optical limit by "Pi of the Sky"
  69. GRB050607: Swift Detection of a long GRB
  70. Limits on a SN in the field of GRB 050509b
  71. GRB 050603: Redshift
  72. GRB 050603 - XRT data analysis of the first day
  73. Konus-Wind observation of GRB 050603
  74. GRB 050603: Analysis of UVOT data
  75. GRB050603: Fading Afterglow observed by Swift UVOT
  76. GRB050603, submillimetre observations
  77. GRB 050603: Swift XRT Position
  78. GRB050603: Radio Detection
  79. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  80. GRB 050603: Afterglow Identification from LCO
  81. Swift/BAT Detection of GRB050603
  82. GRB 050408: jet break in the XRT light curve
  83. GRB 050525a, infrared observations
  84. GRB 050525a, SMARTS optical/IR afterglow observations
  85. GRB050528, XRT observations
  86. Correction to GCN Circ 3502 on GRB 050528
  87. Swift-BAT GRB 050528: a soft burst
  88. Update on Swift-BAT GRB 050528 (Trigger 130679)
  89. Possible GRB050528: no candidate from Liverpool Telescope
  90. Swift-BAT detection of possible GRB 050528
  91. GRB 050509b: refined XRT/Chandra afterglow position analysis
  92. GRB050525a: optical upper limits
  93. GRB 050525a: SARA Observations
  94. GRB 050525B: Swift-BAT observations
  95. GRB 050525: MITSuME Optical Observation in VRI
  96. GRB 050525a: MDM Observations
  97. GRB050525A,optical observation
  98. GRB 050525 : Lulin optical afterglow observations
  99. GRB050525: Super-LOTIS observations
  100. GRB 050525, spectral lag pseudo-redshift

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