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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"

28096 results found.

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

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