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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

21933 results found.

  1. GRB050730: confirmation of redshift
  2. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  3. GRB 050730, SMARTS optical/IR afterglow observations
  4. GRB050730: Liverpool Telescope optical observations
  5. GRB050730: Swift-BAT detection of a weak burst
  6. GRB 050709: PROMPT Rc Observations
  7. GRB050713b: Maidanak optical observations
  8. GRB 050724: Secure Host Redshift from Keck
  9. GRB 050724: WHT optical observations
  10. GRB050726: Swift UVOT observations
  11. GRB 050724: Chandra Observations of the X-ray Afterglow
  12. GRB050724: Refined Radio Position
  13. GRB 050724, SMARTS optical/IR afterglow observations
  14. GRB 050726, SMARTS optical/IR observations
  15. GRB 050727: RTT150 optical observations
  16. GRB050724: VLT observations of the variable source
  17. GRB 050726: PROMPT Rc Observations
  18. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  19. GRB050724: Further Radio Observations
  20. GRB 050726: early Swift XRT analysis results
  21. GRB050726: Swift-BAT detection of a weak burst
  22. GRB 050724: Optical Variability in Nearby Galaxy
  23. GRB 050724: J-band observations
  24. GRB 050724: GMOS Imaging and Spectroscopy
  25. GRB050724: Radio Observation
  26. GRB 050724: spectroscopy of object in the XRT error circle
  27. GRB 050724: optical and near-IR observations
  28. GRB 050724: Optical imaging/astrometry
  29. GRB 050724: RTT150 optical observations
  30. GRB 050724 : Lulin early R-band monitoring observations
  31. GRB 050724: possible host galaxy in DSS
  32. GRB 050721: early afterglow light curve
  33. GRB 050721: optical afterglow confirmed
  34. GRB 050721a: Optical Observations
  35. GRB 050717: PROMPT RcIc Observations
  36. GRB050712: Radio Observations
  37. GRB 050712, Tautenburg optical afterglow observations
  38. Swift-BAT detection of a possible GRB
  39. GRB 050714B: VLT R-band observations
  40. GRB 050717: Additional LCO observations
  41. GRB 050716; J-band observations
  42. GRB 050717: LCO near-IR observations
  43. Swift/UVOT Observations of GRB 050717
  44. GRB 050717: Refined XRT analysis.
  45. Swift detection of GRB 050717
  46. GRB 050716 - UKIRT identification of candidate afterglow
  47. Swift UVOT Observations of GRB 050716
  48. GRB 050716: Refined XRT analysis.
  49. GRB 050716: Lulin B and R band optical observations
  50. GRB 050716: Optical Observations
  51. GRB050716: Faulkes North Telescope observation
  52. Swift/BAT detection of GRB 050716
  53. Swift UVOT Observations of GRB 050714B
  54. GRB 050714B: refined XRT analysis
  55. GRB 050713b: RTT150 optical observations
  56. Swift detection of a long transient (GRB 050714B?)
  57. GRB 050709: optical afterglow candidate
  58. GRB 050714, optical observations
  59. GRB 050709: Spectroscopy
  60. GRB050713B :Swift/UVOT observations
  61. GRB050712: TNG R-band observations
  62. GRB050712: Swift UVOT Observation of Afterglow Emission
  63. GRB 050713A : Lulin R-band observation
  64. GRB 050713b : Lulin R-band observations
  65. GRB050713B: Faulkes North Telescope observation
  66. RBO RI observations of GRB 050713A
  67. GRB 050713B
  68. GRB050713: Liverpool Telescope prompt observations
  69. GRB 050712, optical observations
  70. GRB050709: Candidate X-ray Afterglow from Chandra
  71. GRB 050713, R-band observations at NOT
  72. GRB 050713: ARC NIR Detections and Identification of Fading
  73. GRB 050713: Swift detection of Bright Burst
  74. GRB050709: Radio Observations
  75. GRB 050709: Swift UVOT and XRT observations
  76. GRB 050712: Swift detection of a weak burst
  77. GRB 050709: LCO40 Observations
  78. GRB050709, optical observations
  79. PROMPT Rc Observations of GRB 050709
  80. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  81. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  82. GRB 050626 optical observations
  83. GRB 050626: Swift XRT observations
  84. GRB 050701, optical observations
  85. GRB 050408: ARC 3.5-meter NIR Observations
  86. Swift UVOT observations of GRB 050701
  87. GRB 050607, radio observations
  88. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  89. GRB 050525A: Swift Late-Time Decay Rate
  90. GRB050525a: HST Observations
  91. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  92. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  93. XRF 050509c: Optical monitoring
  94. XRF050509c: Radio Detection
  95. GRB 050416(a): Host Galaxy Redshift Determination
  96. GRB 050607: MDM Observation
  97. GRB 050607 optical decay
  98. GRB 050607: RTT150 optical observations
  99. GRB050607: refined analysis of prompt REM observations
  100. Swift/UVOT observations of GRB050607

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