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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"

28113 results found.

  1. GRB050814: SWIFT/UVOT observation
  2. GRB050814: Refined analysis of the Swift-BAT burst
  3. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  4. GRB 050814: Swift XRT Afterglow Localization
  5. GRB 050814: Swift detection of a burst
  6. GRB 050813: Magellan detection of a high redshift galaxy cluster
  7. GRB050813, SDSS pre-burst observations
  8. GRB 050813: Swift-BAT refined analysis
  9. GRB 050813: Photometry of object in XRT error circle
  10. GRB050813: SWIFT/UVOT observation
  11. GRB 050813: Swift XRT afterglow localization
  12. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  13. Detection of an intermediate burst from SGR 1806-20 on August 8
  14. GRB050805b: CrAO optical limit
  15. GRB050803, optical observations
  16. Retraction of Swift Trigger 149131 (GRB 050805B)
  17. GRB 050805b: OHP optical limits
  18. GRB 050805b: TAROT optical limits
  19. GRB050805b: MASTER optical observations
  20. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  21. GRB050805a: MASTER optical candidat
  22. GRB050802: TNG optical observations
  23. GRB050803: Radio Observation
  24. GRB 050803: RTT150 optical observations
  25. GRB050801: Radio Observation
  26. GRB050730: Radio Detection
  27. GRB 050803: Keck Observations
  28. GRB 050803: Swift-BAT refined analysis
  29. GRB 050802.422: Fading of the afterglow and detection of the host
  30. GRB 050803: early Swift XRT analysis results
  31. GRB 050803: TAROT optical limits
  32. GCN GRB observation 050713A
  33. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  34. GRB050802 radio non-detection
  35. GRB 050730: OHP optical observations
  36. GRB 050802: early Swift XRT analysis results
  37. GRB 050802: Swift/UVOT observations
  38. GRB 050802: Swift-BAT refined analysis
  39. GRB050801: Optical photometry and decay index
  40. GRB 050802: Swift Gamma-ray Burst
  41. GRB050801: Swift/UVOT Optical and UV detections
  42. GRB 050730: Preliminary Analysis of MIKE Spectrum
  43. GCN 050801: early Swift XRT analysis results
  44. GRB 050801: Swift-BAT refined analysis
  45. GRB 050730: XRT refined analysis
  46. GRB 050730: early TAROT optical observations
  47. GRB 050730, spectra and optical photometry
  48. GRB050730: Refined BAT analysis of the Swift-BAT burst
  49. GRB 050730 XMM-Newton observation
  50. GRB050730: Swift-BAT detection of a weak burst
  51. GRB050713b: Maidanak optical observations
  52. GRB 050724: Secure Host Redshift from Keck
  53. GRB 050724: WHT optical observations
  54. GRB050713: analysis of the XMM-Newton observation
  55. Swift-BAT trigger 147918 is not a real GRB
  56. GRB050724: VLT observations of the variable source
  57. GRB050709: Second Epoch Chandra Observation
  58. GRB050726: Swift-BAT detection of a weak burst
  59. GRB 050724: Optical Variability in Nearby Galaxy
  60. GRB 050724: J-band observations
  61. GRB 050724: GMOS Imaging and Spectroscopy
  62. GRB050724: Radio Observation
  63. GRB 050724: Optical imaging/astrometry
  64. GRB 050724: Swift/UVOT Upper Limit
  65. GRB050724: Refined analysis of the Swift-BAT possible short burst
  66. GRB 050724: possible host galaxy in DSS
  67. GRB 050721A: Swift-BAT refined analysis
  68. GRB 050721A: Early Swift XRT analysis results
  69. GRB050721A: optical decay
  70. GRB 050721: optical afterglow confirmed
  71. GRB 050709: Refined Spectral and Temporal Properties
  72. GRB050714b: Radio Observation
  73. GRB050712: Radio Observations
  74. GRB050713a: Radio Observation
  75. GRB 050712, Tautenburg optical afterglow observations
  76. Swift-BAT detection of a possible GRB
  77. GRB 050714B: VLT R-band observations
  78. GRB 050717: Additional LCO observations
  79. GRB 050716; J-band observations
  80. GRB 050717: LCO near-IR observations
  81. Swift/UVOT Observations of GRB 050717
  82. GRB 050717: Swift-BAT refined analysis
  83. GRB050717: Swift XRT position
  84. Swift detection of GRB 050717
  85. Swift UVOT Observations of GRB 050716
  86. GRB 050716: Refined XRT analysis.
  87. GRB050716: Refined analysis of the Swift-BAT burst
  88. GRB 050716: Lulin B and R band optical observations
  89. GRB050716, optical observation
  90. GRB050716: Faulkes North Telescope observation
  91. GRB050715: Refined analysis of the Swift-BAT burst
  92. GRB 050715: Swift-BAT detection
  93. GRB 050713b: RTT150 optical observations
  94. GRB050714B: Refined analysis of the Swift-BAT burst
  95. GRB 050714B: optical afterglow
  96. GRB 050714, R-band candidate
  97. GRB 050714, optical observations
  98. GRB 050713A: XRT refined analysis
  99. GRB 050713A: RAPTOR detection of early optical emission
  100. GRB050713B :Swift/UVOT observations

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