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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"

28124 results found.

  1. GRB 060814: Swift XRT refined analysis
  2. GRB 060814: VLT optical limits
  3. GRB 060814: Swift detection of a bright burst
  4. GRB060813: Swift/UVOT upper limits
  5. GRB 060813: Swift XRT refined analysis
  6. GRB 060813: Swift detection of a burst
  7. GRB051109B: Late-time Radio Observations
  8. Image of the dust-scattering halo around SGR 1806-20
  9. Second VLA limit on new radio point source in SGR 1806-20
  10. A dust-scattering halo detected around SGR 1806-20
  11. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  12. GRB060807: Possible Highly Significant X-ray Emission Lines
  13. GRB060714: optical observations
  14. GRB 060729: An update on the Swift XRT and UVOT observations
  15. GRB060717: optical observations
  16. GRB 060805B: optical observation at Sierra Nevada
  17. GRB 060805B: XRT Team Analysis
  18. VLA Upper Limit on Outburst of SGR 1806-20
  19. GRB 060807: UVOT Upper limits
  20. GRB 060807: afterglow confirmation
  21. GRB 060807: XRT Team refined analysis
  22. GRB060807: optical afterglow candidate
  23. GRB060807: optical upper limit in white light
  24. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  25. GRB 060805B: Swift/UVOT Upper Limits
  26. GRB 060807: Kanazawa R-band observation
  27. GRB 060807: optical limit
  28. GRB 060807: Swift detection of a burst
  29. GRB 060801: Second Epoch WSRT Radio Observations
  30. GRB060805 Liverpool Telescope observations
  31. GRB 060805: optical upper limit in R
  32. GRB 060805: XRT Team Refined Analysis
  33. GRB 060805: Swift/UVOT Upper Limits
  34. GRB 060805: P60 Observations
  35. GRB 060805: Swift detection of a burst
  36. GRB 060804: Swift UVOT observations
  37. GRB 060804: Swift-XRT Team Refined Analysis
  38. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  39. GRB 060728: Upper limits of the X-ray emission
  40. GRB 060801: no variability of optical sources
  41. GRB 060801: WSRT Radio Observations
  42. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  43. GRB060801: Radio Observations
  44. GRB 051109B: Bright spiral host galaxy at low redshift
  45. GRB 060801: optical observations at FORS2/VLT
  46. GRB060801: Swift/UVOT Upper Limits
  47. GRB 060801: optical observations at Hanle and Calar Alto
  48. GRB060801: optical upper limit in R
  49. GRB 060801: Swift XRT refined analysis
  50. GRB 060801: Kanazawa Optical Observation
  51. GRB 060801: Swift detection of a short burst
  52. GRB 060218 / SN 2006aj Nebular Spectrum
  53. GRB 060729 redshift
  54. GRB 060729: Swift/UVOT Detections
  55. GRB 060729: Swift-XRT refined analysis
  56. GRB 060729: Swift/UVOT Observations
  57. GRB 060729: ROTSE-III Detection of Optical Counterpart
  58. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  59. GRB 060728: Refined analysis of the Swift-BAT burst
  60. Swift/XRT preliminary analysis
  61. GRB 060728: Swift detection of a burst
  62. GRB060614 ATCA Radio Limits
  63. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  64. GRB 060714: Swift/UVOT Observations
  65. GRB060719: prompt NIR observations with REM
  66. GRB 060714: NOT observations
  67. GRB 060719: near-infrared afterglow
  68. GRB 060522: VLA observation
  69. GRB 060719: Swift/UVOT Upper Limits
  70. GRB 060719: VLT/ISAAC observations
  71. GRB 060719: XRT refined analysis
  72. GRB 060719: further analysis of VLT observations
  73. GRB 060719: prompt PROMPT observations
  74. GRB060719: REM NIR Observations
  75. GRB 060719: Continued LCO optical observations
  76. GRB 060719: LCO optical observations
  77. GRB 060719: Swift detection of a burst
  78. GRB 060717: Swift XRT refined analysis
  79. GRB 060714: OA fading and a possible host detection
  80. GRB060714: optical observations
  81. GRB 060717: NOT observations
  82. GRB 060714: Refined analysis of the Swift-BAT burst
  83. GRB 060717 optical upper limit
  84. GRB060717: Swift/UVOT upper limits
  85. GRB 060717: Swift XRT refined position
  86. GRB 060714: REM infrared observations
  87. GRB 060717: Swift detection of a burst
  88. GRB060714: optical observations
  89. GRB 060714, SMARTS optical/IR afterglow observation
  90. GRB 060714 : Liverpool Telescope Observations
  91. GRB 060714: Swift XRT refined analysis
  92. GRB 060714: OA redshift
  93. GRB 060708: VLT spectroscopy
  94. GRB060708: MARGE low resolution spectrum observations
  95. Swift trigger 219136 is probably not a GRB
  96. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  97. GRB 060605: SkyNet Optical Limits
  98. GRB060712: P60 Observations
  99. GRB 060712: XRT refined analysis
  100. GRB 060712: Swift/UVOT Upper Limits

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