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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"

26315 results found.

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

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