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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"

28130 results found.

  1. GRB 050820 Swift-BAT refined analysis
  2. GRB050819: refined XRT analysis
  3. GRB 050820: Swift detection of a GRB
  4. GRB 050819 Swift-BAT refined analysis
  5. GRB050819: Swift-BAT detection of a weak burst
  6. GRB 050817: Optical observations
  7. GRB050817: Negative Optical Observations
  8. GRB 050814: continued fading
  9. GRB050815: Optical afterglow detection by Swift UVOT
  10. GRB050815: XRT refined analysis
  11. GRB050815: Refined analysis of the Swift-BAT burst
  12. GRB 050815: ROTSE-III Optical Limits
  13. GRB050815: Swift-BAT detection of a burst
  14. GRB050814: Fading red source
  15. GRB050814: P60 Optical Afterglow Candidate
  16. GRB 050813: Non-fading of afterglow candidate
  17. GRB 050814: XRT refined analysis
  18. GRB050814: SWIFT/UVOT observation
  19. GRB050814: Refined analysis of the Swift-BAT burst
  20. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  21. GRB 050814: Swift XRT Afterglow Localization
  22. GRB 050814: Swift detection of a burst
  23. GRB 050813: Magellan detection of a high redshift galaxy cluster
  24. GRB050813, SDSS pre-burst observations
  25. GRB 050813: Swift-BAT refined analysis
  26. GRB 050813: Photometry of object in XRT error circle
  27. GRB050813: SWIFT/UVOT observation
  28. GRB 050813: Swift XRT afterglow localization
  29. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  30. Detection of an intermediate burst from SGR 1806-20 on August 8
  31. GRB050805b: CrAO optical limit
  32. GRB050803, optical observations
  33. Retraction of Swift Trigger 149131 (GRB 050805B)
  34. GRB 050805b: OHP optical limits
  35. GRB 050805b: TAROT optical limits
  36. GRB050805b: MASTER optical observations
  37. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  38. GRB050805a: MASTER optical candidat
  39. GRB050802: TNG optical observations
  40. GRB050803: Radio Observation
  41. GRB 050803: RTT150 optical observations
  42. GRB050801: Radio Observation
  43. GRB050730: Radio Detection
  44. GRB 050803: Keck Observations
  45. GRB 050803: Swift-BAT refined analysis
  46. GRB 050802.422: Fading of the afterglow and detection of the host
  47. GRB 050803: early Swift XRT analysis results
  48. GRB 050803: TAROT optical limits
  49. GCN GRB observation 050713A
  50. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  51. GRB050802 radio non-detection
  52. GRB 050730: OHP optical observations
  53. GRB 050802: early Swift XRT analysis results
  54. GRB 050802: Swift/UVOT observations
  55. GRB 050802: Swift-BAT refined analysis
  56. GRB050801: Optical photometry and decay index
  57. GRB 050802: Swift Gamma-ray Burst
  58. GRB050801: Swift/UVOT Optical and UV detections
  59. GRB 050730: Preliminary Analysis of MIKE Spectrum
  60. GCN 050801: early Swift XRT analysis results
  61. GRB 050801: Swift-BAT refined analysis
  62. GRB 050730: XRT refined analysis
  63. GRB 050730: early TAROT optical observations
  64. GRB 050730, spectra and optical photometry
  65. GRB050730: Refined BAT analysis of the Swift-BAT burst
  66. GRB 050730 XMM-Newton observation
  67. GRB050730: Swift-BAT detection of a weak burst
  68. GRB050713b: Maidanak optical observations
  69. GRB 050724: Secure Host Redshift from Keck
  70. GRB 050724: WHT optical observations
  71. GRB050713: analysis of the XMM-Newton observation
  72. Swift-BAT trigger 147918 is not a real GRB
  73. GRB050724: VLT observations of the variable source
  74. GRB050709: Second Epoch Chandra Observation
  75. GRB050726: Swift-BAT detection of a weak burst
  76. GRB 050724: Optical Variability in Nearby Galaxy
  77. GRB 050724: J-band observations
  78. GRB 050724: GMOS Imaging and Spectroscopy
  79. GRB050724: Radio Observation
  80. GRB 050724: Optical imaging/astrometry
  81. GRB 050724: Swift/UVOT Upper Limit
  82. GRB050724: Refined analysis of the Swift-BAT possible short burst
  83. GRB 050724: possible host galaxy in DSS
  84. GRB 050721A: Swift-BAT refined analysis
  85. GRB 050721A: Early Swift XRT analysis results
  86. GRB050721A: optical decay
  87. GRB 050721: optical afterglow confirmed
  88. GRB 050709: Refined Spectral and Temporal Properties
  89. GRB050714b: Radio Observation
  90. GRB050712: Radio Observations
  91. GRB050713a: Radio Observation
  92. GRB 050712, Tautenburg optical afterglow observations
  93. Swift-BAT detection of a possible GRB
  94. GRB 050714B: VLT R-band observations
  95. GRB 050717: Additional LCO observations
  96. GRB 050716; J-band observations
  97. GRB 050717: LCO near-IR observations
  98. Swift/UVOT Observations of GRB 050717
  99. GRB 050717: Swift-BAT refined analysis
  100. GRB050717: Swift XRT position

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