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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"

21394 results found.

  1. GRB060805B: optical observations
  2. GRB060814: Swift/UVOT upper limits
  3. GRB 060813: pseudo-z from spectral parameters of the prompt
  4. GRB 060814: Swift XRT refined analysis
  5. GRB 060814 - SDSS Pre-Burst Observations
  6. GRB 060814: TAROT optical observations
  7. GRB 060814: Swift detection of a bright burst
  8. Konus-Wind observation of GRB 060813
  9. GRB060813: Swift/UVOT upper limits
  10. GRB 060813: Swift XRT refined analysis
  11. GRB 060813: Refined analysis of the Swift-BAT burst
  12. GRB 060813: Swift detection of a burst
  13. GRB051109B: Late-time Radio Observations
  14. Image of the dust-scattering halo around SGR 1806-20
  15. A dust-scattering halo detected around SGR 1806-20
  16. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  17. GRB060807: Possible Highly Significant X-ray Emission Lines
  18. GRB060714: optical observations
  19. GRB 060729: An update on the Swift XRT and UVOT observations
  20. GRB060717: optical observations
  21. GRB060807: Optical limiting magnitudes
  22. GRB 060805B: optical observation at Sierra Nevada
  23. GRB 060805B: XRT Team Analysis
  24. GRB 060807: UVOT Upper limits
  25. GRB 060807: XRT Team refined analysis
  26. GRB 060807: Refined analysis of the Swift-BAT burst
  27. GRB060807: optical afterglow candidate
  28. GRB060807: optical upper limit in white light
  29. IPN triangulation of GRB060806 (long, exceptionally bright)
  30. GRB060807 - SDSS Pre-burst Observations
  31. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  32. GRB 060805B: Swift/UVOT Upper Limits
  33. GRB 060807: Kanazawa R-band observation
  34. GRB 060807: optical limit
  35. GRB 060807: Swift detection of a burst
  36. GRB 060801: Second Epoch WSRT Radio Observations
  37. GRB060805 Liverpool Telescope observations
  38. GRB 060805: optical upper limit in R
  39. GRB 060805: XRT Team Refined Analysis
  40. GRB 060805: Swift-BAT Refined Analysis
  41. GRB 060805: Swift/UVOT Upper Limits
  42. GRB 060805: P60 Observations
  43. GRB 060805: KAIT observations
  44. GRB 060805 - SDSS Pre-Burst Observations
  45. GRB 060805: Swift detection of a burst
  46. GRB 060804: Swift UVOT observations
  47. GRB 060804: Swift-XRT Team Refined Analysis
  48. GRB 060804: Refined analysis of the Swift-BAT burst
  49. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  50. GRB 060728: Upper limits of the X-ray emission
  51. GRB 060801: no variability of optical sources
  52. GRB 060801: WSRT Radio Observations
  53. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  54. GRB060801: Radio Observations
  55. GRB 051109B: Bright spiral host galaxy at low redshift
  56. GRB 060801: optical observations at FORS2/VLT
  57. GRB060801: Swift/UVOT Upper Limits
  58. GRB 060801: optical observations at Hanle and Calar Alto
  59. GRB060801: optical upper limit in R
  60. GRB 060801: Swift XRT refined analysis
  61. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  62. GRB 060801: Kanazawa Optical Observation
  63. GRB 060801: Swift detection of a short burst
  64. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  65. Swift-BAT trigger 221873 is not a GRB or a Transient
  66. GRB 060729: Swift/UVOT Detections
  67. GRB 060729: Refined analysis of the Swift-BAT burst
  68. GRB 060729: Swift-XRT refined analysis
  69. GRB 060729: Swift/UVOT Observations
  70. GRB 060729: ROTSE-III Detection of Optical Counterpart
  71. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  72. GRB 060728: Swift/UVOT Upper Limits
  73. GRB 060728: Refined analysis of the Swift-BAT burst
  74. Swift/XRT preliminary analysis
  75. GRB 060728: Swift detection of a burst
  76. GRB060614 ATCA Radio Limits
  77. GRB 060714: Swift/UVOT Observations
  78. GRB 060714: NOT observations
  79. GRB 060522: VLA observation
  80. GRB 060719: Swift/UVOT Upper Limits
  81. GRB 060719: VLT/ISAAC observations
  82. GRB 060719: Refined analysis of the Swift-BAT burst
  83. GRB 060719: XRT refined analysis
  84. GRB 060719: further analysis of VLT observations
  85. GRB 060719: optical limit by Pi-of-the-Sky
  86. GRB060719: FRAM early follow-up limit
  87. GRB060719: REM NIR Observations
  88. GRB 060719: LCO optical observations
  89. GRB 060719: Swift detection of a burst
  90. GRB 060717: Swift XRT refined analysis
  91. GRB 060717: NOT observations
  92. GRB 060714: Refined analysis of the Swift-BAT burst
  93. GRB 060717 optical upper limit
  94. GRB060717: Swift/UVOT upper limits
  95. GRB 060717: Swift XRT refined position
  96. GRB 060717: Swift-BAT refined analysis
  97. GRB 060717: Swift detection of a burst
  98. GRB 060714 : Liverpool Telescope Observations
  99. GRB 060714: Swift XRT refined analysis
  100. GRB 060708: VLT spectroscopy

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