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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"

27392 results found.

  1. GRB050802: TNG optical observations
  2. GRB050803: Radio Observation
  3. GRB 050803: RTT150 optical observations
  4. GRB050801: Radio Observation
  5. GRB050730: Radio Detection
  6. GRB 050803: Keck Observations
  7. GRB 050803: Swift-BAT refined analysis
  8. GRB 050802.422: Fading of the afterglow and detection of the host
  9. GRB 050803: early Swift XRT analysis results
  10. GRB 050803: TAROT optical limits
  11. GCN GRB observation 050713A
  12. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  13. GRB050802 radio non-detection
  14. GRB 050730: OHP optical observations
  15. GRB 050802: early Swift XRT analysis results
  16. GRB 050802: Swift/UVOT observations
  17. GRB 050802: Swift-BAT refined analysis
  18. GRB050801: Optical photometry and decay index
  19. GRB 050802: Swift Gamma-ray Burst
  20. GRB050801: Swift/UVOT Optical and UV detections
  21. GRB 050730: Preliminary Analysis of MIKE Spectrum
  22. GCN 050801: early Swift XRT analysis results
  23. GRB 050801: Swift-BAT refined analysis
  24. GRB 050730: XRT refined analysis
  25. GRB 050730: early TAROT optical observations
  26. GRB 050730, spectra and optical photometry
  27. GRB050730: Refined BAT analysis of the Swift-BAT burst
  28. GRB 050730 XMM-Newton observation
  29. GRB050730: Swift-BAT detection of a weak burst
  30. GRB050713b: Maidanak optical observations
  31. GRB 050724: Secure Host Redshift from Keck
  32. GRB 050724: WHT optical observations
  33. GRB050713: analysis of the XMM-Newton observation
  34. Swift-BAT trigger 147918 is not a real GRB
  35. GRB050724: VLT observations of the variable source
  36. GRB050709: Second Epoch Chandra Observation
  37. GRB050726: Swift-BAT detection of a weak burst
  38. GRB 050724: Optical Variability in Nearby Galaxy
  39. GRB 050724: J-band observations
  40. GRB 050724: GMOS Imaging and Spectroscopy
  41. GRB050724: Radio Observation
  42. GRB 050724: Optical imaging/astrometry
  43. GRB 050724: Swift/UVOT Upper Limit
  44. GRB050724: Refined analysis of the Swift-BAT possible short burst
  45. GRB 050724: possible host galaxy in DSS
  46. GRB 050721A: Swift-BAT refined analysis
  47. GRB 050721A: Early Swift XRT analysis results
  48. GRB050721A: optical decay
  49. GRB 050721: optical afterglow confirmed
  50. GRB 050709: Refined Spectral and Temporal Properties
  51. GRB050714b: Radio Observation
  52. GRB050712: Radio Observations
  53. GRB050713a: Radio Observation
  54. GRB 050712, Tautenburg optical afterglow observations
  55. Swift-BAT detection of a possible GRB
  56. GRB 050714B: VLT R-band observations
  57. GRB 050717: Additional LCO observations
  58. GRB 050716; J-band observations
  59. GRB 050717: LCO near-IR observations
  60. Swift/UVOT Observations of GRB 050717
  61. GRB 050717: Swift-BAT refined analysis
  62. GRB050717: Swift XRT position
  63. Swift detection of GRB 050717
  64. Swift UVOT Observations of GRB 050716
  65. GRB 050716: Refined XRT analysis.
  66. GRB050716: Refined analysis of the Swift-BAT burst
  67. GRB 050716: Lulin B and R band optical observations
  68. GRB050716, optical observation
  69. GRB050716: Faulkes North Telescope observation
  70. GRB050715: Refined analysis of the Swift-BAT burst
  71. GRB 050715: Swift-BAT detection
  72. GRB 050713b: RTT150 optical observations
  73. GRB050714B: Refined analysis of the Swift-BAT burst
  74. GRB 050714B: optical afterglow
  75. GRB 050714, R-band candidate
  76. GRB 050714, optical observations
  77. GRB 050713A: XRT refined analysis
  78. GRB 050713A: RAPTOR detection of early optical emission
  79. GRB050713B :Swift/UVOT observations
  80. GRB050713b: XRT refined analysis
  81. GRB050712: TNG R-band observations
  82. GRB 050713B: Swift-BAT Refined Analysis
  83. GRB 050713A: Swift/UVOT observation
  84. GRB 050713A : Swift-BAT Refined Analysis
  85. GRB050712: Swift UVOT Observation of Afterglow Emission
  86. GRB 050713A : Lulin R-band observation
  87. GRB 050713A XMM-Newton observation
  88. GRB 050713b : Lulin R-band observations
  89. GRB050713B: Faulkes North Telescope observation
  90. RBO RI observations of GRB 050713A
  91. GRB 050713B
  92. GRB050709 : Chandra source optical counterpart
  93. GRB050713: Liverpool Telescope prompt observations
  94. GRB 050712, optical observations
  95. GRB050709: Candidate X-ray Afterglow from Chandra
  96. GRB050713: possible I-band afterglow
  97. GRB050712: XRT refined analysis
  98. GRB050709: Radio Observations
  99. GRB 050709: Swift UVOT and XRT observations
  100. GRB 050712: Swift-BAT Refined Analysis

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