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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"

28109 results found.

  1. GRB 050814: Swift detection of a burst
  2. GRB 050813: Magellan detection of a high redshift galaxy cluster
  3. GRB050813, SDSS pre-burst observations
  4. GRB 050813: Swift-BAT refined analysis
  5. GRB 050813: Photometry of object in XRT error circle
  6. GRB050813: SWIFT/UVOT observation
  7. GRB 050813: Swift XRT afterglow localization
  8. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  9. Detection of an intermediate burst from SGR 1806-20 on August 8
  10. GRB050805b: CrAO optical limit
  11. GRB050803, optical observations
  12. Retraction of Swift Trigger 149131 (GRB 050805B)
  13. GRB 050805b: OHP optical limits
  14. GRB 050805b: TAROT optical limits
  15. GRB050805b: MASTER optical observations
  16. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  17. GRB050805a: MASTER optical candidat
  18. GRB050802: TNG optical observations
  19. GRB050803: Radio Observation
  20. GRB 050803: RTT150 optical observations
  21. GRB050801: Radio Observation
  22. GRB050730: Radio Detection
  23. GRB 050803: Keck Observations
  24. GRB 050803: Swift-BAT refined analysis
  25. GRB 050802.422: Fading of the afterglow and detection of the host
  26. GRB 050803: early Swift XRT analysis results
  27. GRB 050803: TAROT optical limits
  28. GCN GRB observation 050713A
  29. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  30. GRB050802 radio non-detection
  31. GRB 050730: OHP optical observations
  32. GRB 050802: early Swift XRT analysis results
  33. GRB 050802: Swift/UVOT observations
  34. GRB 050802: Swift-BAT refined analysis
  35. GRB050801: Optical photometry and decay index
  36. GRB 050802: Swift Gamma-ray Burst
  37. GRB050801: Swift/UVOT Optical and UV detections
  38. GRB 050730: Preliminary Analysis of MIKE Spectrum
  39. GCN 050801: early Swift XRT analysis results
  40. GRB 050801: Swift-BAT refined analysis
  41. GRB 050730: XRT refined analysis
  42. GRB 050730: early TAROT optical observations
  43. GRB 050730, spectra and optical photometry
  44. GRB050730: Refined BAT analysis of the Swift-BAT burst
  45. GRB 050730 XMM-Newton observation
  46. GRB050730: Swift-BAT detection of a weak burst
  47. GRB050713b: Maidanak optical observations
  48. GRB 050724: Secure Host Redshift from Keck
  49. GRB 050724: WHT optical observations
  50. GRB050713: analysis of the XMM-Newton observation
  51. Swift-BAT trigger 147918 is not a real GRB
  52. GRB050724: VLT observations of the variable source
  53. GRB050709: Second Epoch Chandra Observation
  54. GRB050726: Swift-BAT detection of a weak burst
  55. GRB 050724: Optical Variability in Nearby Galaxy
  56. GRB 050724: J-band observations
  57. GRB 050724: GMOS Imaging and Spectroscopy
  58. GRB050724: Radio Observation
  59. GRB 050724: Optical imaging/astrometry
  60. GRB 050724: Swift/UVOT Upper Limit
  61. GRB050724: Refined analysis of the Swift-BAT possible short burst
  62. GRB 050724: possible host galaxy in DSS
  63. GRB 050721A: Swift-BAT refined analysis
  64. GRB 050721A: Early Swift XRT analysis results
  65. GRB050721A: optical decay
  66. GRB 050721: optical afterglow confirmed
  67. GRB 050709: Refined Spectral and Temporal Properties
  68. GRB050714b: Radio Observation
  69. GRB050712: Radio Observations
  70. GRB050713a: Radio Observation
  71. GRB 050712, Tautenburg optical afterglow observations
  72. Swift-BAT detection of a possible GRB
  73. GRB 050714B: VLT R-band observations
  74. GRB 050717: Additional LCO observations
  75. GRB 050716; J-band observations
  76. GRB 050717: LCO near-IR observations
  77. Swift/UVOT Observations of GRB 050717
  78. GRB 050717: Swift-BAT refined analysis
  79. GRB050717: Swift XRT position
  80. Swift detection of GRB 050717
  81. Swift UVOT Observations of GRB 050716
  82. GRB 050716: Refined XRT analysis.
  83. GRB050716: Refined analysis of the Swift-BAT burst
  84. GRB 050716: Lulin B and R band optical observations
  85. GRB050716, optical observation
  86. GRB050716: Faulkes North Telescope observation
  87. GRB050715: Refined analysis of the Swift-BAT burst
  88. GRB 050715: Swift-BAT detection
  89. GRB 050713b: RTT150 optical observations
  90. GRB050714B: Refined analysis of the Swift-BAT burst
  91. GRB 050714B: optical afterglow
  92. GRB 050714, R-band candidate
  93. GRB 050714, optical observations
  94. GRB 050713A: XRT refined analysis
  95. GRB 050713A: RAPTOR detection of early optical emission
  96. GRB050713B :Swift/UVOT observations
  97. GRB050713b: XRT refined analysis
  98. GRB050712: TNG R-band observations
  99. GRB 050713B: Swift-BAT Refined Analysis
  100. GRB 050713A: Swift/UVOT observation

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