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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"

21392 results found.

  1. GRB 060813: pseudo-z from spectral parameters of the prompt
  2. GRB 060814: Swift XRT refined analysis
  3. GRB 060814 - SDSS Pre-Burst Observations
  4. GRB 060814: TAROT optical observations
  5. GRB 060814: Swift detection of a bright burst
  6. Konus-Wind observation of GRB 060813
  7. GRB060813: Swift/UVOT upper limits
  8. GRB 060813: Swift XRT refined analysis
  9. GRB 060813: Refined analysis of the Swift-BAT burst
  10. GRB 060813: Swift detection of a burst
  11. GRB051109B: Late-time Radio Observations
  12. Image of the dust-scattering halo around SGR 1806-20
  13. A dust-scattering halo detected around SGR 1806-20
  14. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  15. GRB060807: Possible Highly Significant X-ray Emission Lines
  16. GRB060714: optical observations
  17. GRB 060729: An update on the Swift XRT and UVOT observations
  18. GRB060717: optical observations
  19. GRB060807: Optical limiting magnitudes
  20. GRB 060805B: optical observation at Sierra Nevada
  21. GRB 060805B: XRT Team Analysis
  22. GRB 060807: UVOT Upper limits
  23. GRB 060807: XRT Team refined analysis
  24. GRB 060807: Refined analysis of the Swift-BAT burst
  25. GRB060807: optical afterglow candidate
  26. GRB060807: optical upper limit in white light
  27. IPN triangulation of GRB060806 (long, exceptionally bright)
  28. GRB060807 - SDSS Pre-burst Observations
  29. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  30. GRB 060805B: Swift/UVOT Upper Limits
  31. GRB 060807: Kanazawa R-band observation
  32. GRB 060807: optical limit
  33. GRB 060807: Swift detection of a burst
  34. GRB 060801: Second Epoch WSRT Radio Observations
  35. GRB060805 Liverpool Telescope observations
  36. GRB 060805: optical upper limit in R
  37. GRB 060805: XRT Team Refined Analysis
  38. GRB 060805: Swift-BAT Refined Analysis
  39. GRB 060805: Swift/UVOT Upper Limits
  40. GRB 060805: P60 Observations
  41. GRB 060805: KAIT observations
  42. GRB 060805 - SDSS Pre-Burst Observations
  43. GRB 060805: Swift detection of a burst
  44. GRB 060804: Swift UVOT observations
  45. GRB 060804: Swift-XRT Team Refined Analysis
  46. GRB 060804: Refined analysis of the Swift-BAT burst
  47. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  48. GRB 060728: Upper limits of the X-ray emission
  49. GRB 060801: no variability of optical sources
  50. GRB 060801: WSRT Radio Observations
  51. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  52. GRB060801: Radio Observations
  53. GRB 051109B: Bright spiral host galaxy at low redshift
  54. GRB 060801: optical observations at FORS2/VLT
  55. GRB060801: Swift/UVOT Upper Limits
  56. GRB 060801: optical observations at Hanle and Calar Alto
  57. GRB060801: optical upper limit in R
  58. GRB 060801: Swift XRT refined analysis
  59. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  60. GRB 060801: Kanazawa Optical Observation
  61. GRB 060801: Swift detection of a short burst
  62. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  63. Swift-BAT trigger 221873 is not a GRB or a Transient
  64. GRB 060729: Swift/UVOT Detections
  65. GRB 060729: Refined analysis of the Swift-BAT burst
  66. GRB 060729: Swift-XRT refined analysis
  67. GRB 060729: Swift/UVOT Observations
  68. GRB 060729: ROTSE-III Detection of Optical Counterpart
  69. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  70. GRB 060728: Swift/UVOT Upper Limits
  71. GRB 060728: Refined analysis of the Swift-BAT burst
  72. Swift/XRT preliminary analysis
  73. GRB 060728: Swift detection of a burst
  74. GRB060614 ATCA Radio Limits
  75. GRB 060714: Swift/UVOT Observations
  76. GRB 060714: NOT observations
  77. GRB 060522: VLA observation
  78. GRB 060719: Swift/UVOT Upper Limits
  79. GRB 060719: VLT/ISAAC observations
  80. GRB 060719: Refined analysis of the Swift-BAT burst
  81. GRB 060719: XRT refined analysis
  82. GRB 060719: further analysis of VLT observations
  83. GRB 060719: optical limit by Pi-of-the-Sky
  84. GRB060719: FRAM early follow-up limit
  85. GRB060719: REM NIR Observations
  86. GRB 060719: LCO optical observations
  87. GRB 060719: Swift detection of a burst
  88. GRB 060717: Swift XRT refined analysis
  89. GRB 060717: NOT observations
  90. GRB 060714: Refined analysis of the Swift-BAT burst
  91. GRB 060717 optical upper limit
  92. GRB060717: Swift/UVOT upper limits
  93. GRB 060717: Swift XRT refined position
  94. GRB 060717: Swift-BAT refined analysis
  95. GRB 060717: Swift detection of a burst
  96. GRB 060714 : Liverpool Telescope Observations
  97. GRB 060714: Swift XRT refined analysis
  98. GRB 060708: VLT spectroscopy
  99. GRB060708: MARGE low resolution spectrum observations
  100. Swift-BAT trigger 219136 is not a GRB

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