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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"

45662 results found.

  1. GRB 060813: Refined analysis of the Swift-BAT burst
  2. GRB 060813: Swift detection of a burst
  3. GRB051109B: Late-time Radio Observations
  4. Image of the dust-scattering halo around SGR 1806-20
  5. Second VLA limit on new radio point source in SGR 1806-20
  6. A dust-scattering halo detected around SGR 1806-20
  7. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  8. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  9. GRB060807: Possible Highly Significant X-ray Emission Lines
  10. GRB060714: optical observations
  11. IBAS Alert n. 3422: not a GRB
  12. GRB 060729: An update on the Swift XRT and UVOT observations
  13. GRB060717: optical observations
  14. GRB060807: Optical limiting magnitudes
  15. GRB 060805B: optical observation at Sierra Nevada
  16. GRB 060805B: XRT Team Analysis
  17. VLA Upper Limit on Outburst of SGR 1806-20
  18. GRB060806 is similar to previous activity of SGR1806-20
  19. GRB 060807: UVOT Upper limits
  20. GRB 060807: afterglow confirmation
  21. GRB 060807: XRT Team refined analysis
  22. GRB 060807: K- and R-band observations
  23. GRB 060807: Refined analysis of the Swift-BAT burst
  24. GRB060807: optical afterglow candidate
  25. GRB060806 = SGR1806-20
  26. GRB 060805B: RHESSI Spectral Fit
  27. GRB060807: optical upper limit in white light
  28. IPN triangulation of GRB060806 (long, exceptionally bright)
  29. GRB060807 - SDSS Pre-burst Observations
  30. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  31. GRB 060805B: Swift/UVOT Upper Limits
  32. GRB 060807, optical observation
  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. IPN triangulation of GRB060805B
  38. GRB060805 Liverpool Telescope observations
  39. GRB 060805: optical upper limit in R
  40. GRB 060805: XRT Team Refined Analysis
  41. GRB 060805: Swift-BAT Refined Analysis
  42. GRB 060805: Swift/UVOT Upper Limits
  43. GRB 060805: P60 Observations
  44. GRB 060805: KAIT observations
  45. GRB 060805 - SDSS Pre-Burst Observations
  46. GRB 060805: Swift detection of a burst
  47. GRB 060804: Swift UVOT observations
  48. GRB 060804: Swift-XRT Team Refined Analysis
  49. GRB 060804: Refined analysis of the Swift-BAT burst
  50. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  51. GRB 060728: Upper limits of the X-ray emission
  52. GRB 060801: no variability of optical sources
  53. GRB 060801: WSRT Radio Observations
  54. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  55. GRB060801: Radio Observations
  56. GRB 051109B: Bright spiral host galaxy at low redshift
  57. GRB 060801: optical observations at FORS2/VLT
  58. GRB060801: Swift/UVOT Upper Limits
  59. GRB 060801: optical observations at Hanle and Calar Alto
  60. GRB060801: optical upper limit in R
  61. GRB 060801: Swift XRT refined analysis
  62. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  63. GRB 060801, optical observation
  64. GRB 060801: Kanazawa Optical Observation
  65. GRB 060801: Swift detection of a short burst
  66. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  67. GRB 060218 / SN 2006aj Nebular Spectrum
  68. IBAS Alert n. 3415: not a GRB
  69. Swift-BAT trigger 221873 is not a GRB or a Transient
  70. GRB 060729 redshift
  71. GRB 060719: TORTOREM optical upper limits
  72. GRB 060729: Swift/UVOT Detections
  73. GRB 060729: Refined analysis of the Swift-BAT burst
  74. GRB 060729: Swift-XRT refined analysis
  75. GRB 060729 : Planned XMM-Newton observation
  76. GRB 060729: Swift/UVOT Observations
  77. GRB 060729: ROTSE-III Detection of Optical Counterpart
  78. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  79. GRB 060728: Swift/UVOT Upper Limits
  80. GRB 060728: Refined analysis of the Swift-BAT burst
  81. GRB 060728, SMARTS optical/IR observations
  82. Swift/XRT preliminary analysis
  83. GRB 060728: Swift detection of a burst
  84. GRB060614 ATCA Radio Limits
  85. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  86. GRB 060714: Swift/UVOT Observations
  87. GRB060719: prompt NIR observations with REM
  88. GRB 060714: NOT observations
  89. GRB 060719: near-infrared afterglow
  90. GRB 060719: correction to the coordinates reported in GCN 5347
  91. GRB 060522: VLA observation
  92. GRB 060719: Swift/UVOT Upper Limits
  93. GRB 060719: VLT/ISAAC observations
  94. GRB 060719: Refined analysis of the Swift-BAT burst
  95. GRB 060719: XRT refined analysis
  96. GRB 060719: further analysis of VLT observations
  97. GRB 060719: optical limit by Pi-of-the-Sky
  98. GRB060719: FRAM early follow-up limit
  99. GRB 060719: prompt PROMPT observations
  100. GRB060719: REM NIR Observations

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