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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"

45590 results found.

  1. GRB060825: BOOTES-IR optical observations
  2. GRB 060825: Swift detection of a burst
  3. GRB060801: host galaxy redshift
  4. GRB060729: analysis of XMM-Newton observation
  5. GRB 060814: pseudo-z from spectral parameters of the prompt
  6. IBAS Alerts No 3429 and 3430: not GRBs
  7. Radio observations of GRB 060719
  8. GRB 060729, SMARTS optical/IR observations
  9. GRB060814: Break in the XRT light curve
  10. GRB060813: Break in the XRT light curve
  11. GRB 060813: A long, bright GRB detected with Suzaku WAM
  12. GRB 060814: Confirmation of IR afterglow
  13. Konus-Wind observation of GRB 060814
  14. GRB 060814: Refined analysis of the Swift-BAT burst
  15. GRB 060814: P60 Observations
  16. GRB 060814: P200 NIR Observations
  17. GRB 060814: source inside revised XRT error box
  18. GRB 060814: Possible IR counterpart
  19. GRB060805B: optical observations
  20. GRB060814: Swift/UVOT upper limits
  21. GRB 060813: pseudo-z from spectral parameters of the prompt
  22. GRB 060814: Swift XRT refined analysis
  23. GRB 060814: VLT optical limits
  24. GRB 060814 - SDSS Pre-Burst Observations
  25. GRB 060814: TAROT optical observations
  26. GRB 060814: Swift detection of a bright burst
  27. Konus-Wind observation of GRB 060813
  28. GRB060813: Swift/UVOT upper limits
  29. GRB 060813: Swift XRT refined analysis
  30. GRB 060813: Refined analysis of the Swift-BAT burst
  31. GRB 060813: Swift detection of a burst
  32. GRB051109B: Late-time Radio Observations
  33. Image of the dust-scattering halo around SGR 1806-20
  34. Second VLA limit on new radio point source in SGR 1806-20
  35. A dust-scattering halo detected around SGR 1806-20
  36. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  37. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  38. GRB060807: Possible Highly Significant X-ray Emission Lines
  39. GRB060714: optical observations
  40. IBAS Alert n. 3422: not a GRB
  41. GRB 060729: An update on the Swift XRT and UVOT observations
  42. GRB060717: optical observations
  43. GRB060807: Optical limiting magnitudes
  44. GRB 060805B: optical observation at Sierra Nevada
  45. GRB 060805B: XRT Team Analysis
  46. VLA Upper Limit on Outburst of SGR 1806-20
  47. GRB060806 is similar to previous activity of SGR1806-20
  48. GRB 060807: UVOT Upper limits
  49. GRB 060807: afterglow confirmation
  50. GRB 060807: XRT Team refined analysis
  51. GRB 060807: K- and R-band observations
  52. GRB 060807: Refined analysis of the Swift-BAT burst
  53. GRB060807: optical afterglow candidate
  54. GRB060806 = SGR1806-20
  55. GRB 060805B: RHESSI Spectral Fit
  56. GRB060807: optical upper limit in white light
  57. IPN triangulation of GRB060806 (long, exceptionally bright)
  58. GRB060807 - SDSS Pre-burst Observations
  59. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  60. GRB 060805B: Swift/UVOT Upper Limits
  61. GRB 060807, optical observation
  62. GRB 060807: Kanazawa R-band observation
  63. GRB 060807: optical limit
  64. GRB 060807: Swift detection of a burst
  65. GRB 060801: Second Epoch WSRT Radio Observations
  66. IPN triangulation of GRB060805B
  67. GRB060805 Liverpool Telescope observations
  68. GRB 060805: optical upper limit in R
  69. GRB 060805: XRT Team Refined Analysis
  70. GRB 060805: Swift-BAT Refined Analysis
  71. GRB 060805: Swift/UVOT Upper Limits
  72. GRB 060805: P60 Observations
  73. GRB 060805: KAIT observations
  74. GRB 060805 - SDSS Pre-Burst Observations
  75. GRB 060805: Swift detection of a burst
  76. GRB 060804: Swift UVOT observations
  77. GRB 060804: Swift-XRT Team Refined Analysis
  78. GRB 060804: Refined analysis of the Swift-BAT burst
  79. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  80. GRB 060728: Upper limits of the X-ray emission
  81. GRB 060801: no variability of optical sources
  82. GRB 060801: WSRT Radio Observations
  83. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  84. GRB060801: Radio Observations
  85. GRB 051109B: Bright spiral host galaxy at low redshift
  86. GRB 060801: optical observations at FORS2/VLT
  87. GRB060801: Swift/UVOT Upper Limits
  88. GRB 060801: optical observations at Hanle and Calar Alto
  89. GRB060801: optical upper limit in R
  90. GRB 060801: Swift XRT refined analysis
  91. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  92. GRB 060801, optical observation
  93. GRB 060801: Kanazawa Optical Observation
  94. GRB 060801: Swift detection of a short burst
  95. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  96. GRB 060218 / SN 2006aj Nebular Spectrum
  97. IBAS Alert n. 3415: not a GRB
  98. Swift-BAT trigger 221873 is not a GRB or a Transient
  99. GRB 060729 redshift
  100. GRB 060719: TORTOREM optical upper limits

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