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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"

20445 results found.

  1. GRB 060814: P200 NIR Observations
  2. GRB 060814: VLT optical limits
  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. GRB 060813: Swift detection of a burst
  8. GRB051109B: Late-time Radio Observations
  9. Second VLA limit on new radio point source in SGR 1806-20
  10. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  11. GRB060807: Possible Highly Significant X-ray Emission Lines
  12. GRB 060729: An update on the Swift XRT and UVOT observations
  13. GRB060717: optical observations
  14. GRB 060805B: XRT Team Analysis
  15. VLA Upper Limit on Outburst of SGR 1806-20
  16. GRB060806 is similar to previous activity of SGR1806-20
  17. GRB 060807: K- and R-band observations
  18. GRB060807: optical afterglow candidate
  19. GRB060807: optical upper limit in white light
  20. IPN triangulation of GRB060806 (long, exceptionally bright)
  21. GRB060807 - SDSS Pre-burst Observations
  22. GRB 060805B: Swift/UVOT Upper Limits
  23. GRB 060807, optical observation
  24. GRB 060807: Kanazawa R-band observation
  25. GRB060805 Liverpool Telescope observations
  26. GRB 060805: Swift/UVOT Upper Limits
  27. GRB 060805: P60 Observations
  28. GRB 060805 - SDSS Pre-Burst Observations
  29. GRB 060805: Swift detection of a burst
  30. GRB 060804: Swift UVOT observations
  31. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  32. GRB 060728: Upper limits of the X-ray emission
  33. GRB 060801: no variability of optical sources
  34. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  35. GRB060801: Radio Observations
  36. GRB 051109B: Bright spiral host galaxy at low redshift
  37. GRB060801: Swift/UVOT Upper Limits
  38. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  39. GRB 060801, optical observation
  40. GRB 060801: Kanazawa Optical Observation
  41. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  42. GRB 060719: TORTOREM optical upper limits
  43. GRB 060729: Swift-XRT refined analysis
  44. GRB 060729: Swift/UVOT Observations
  45. GRB 060729: ROTSE-III Detection of Optical Counterpart
  46. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  47. GRB 060728: Swift/UVOT Upper Limits
  48. GRB 060728, SMARTS optical/IR observations
  49. Swift/XRT preliminary analysis
  50. GRB 060728: Swift detection of a burst
  51. GRB 060714: Swift/UVOT Observations
  52. GRB060719: prompt NIR observations with REM
  53. GRB 060714: NOT observations
  54. GRB 060719: near-infrared afterglow
  55. GRB 060522: VLA observation
  56. GRB 060719: Swift/UVOT Upper Limits
  57. GRB 060719: VLT/ISAAC observations
  58. GRB 060719: Refined analysis of the Swift-BAT burst
  59. GRB 060719: XRT refined analysis
  60. GRB060719: REM NIR Observations
  61. GRB 060719: VLT observations
  62. GRB 060719: LCO optical observations
  63. GRB 060719: Swift detection of a burst
  64. GRB 060714: Refined analysis of the Swift-BAT burst
  65. GRB060717: Swift/UVOT upper limits
  66. GRB060717 - SDSS Pre-burst Observations
  67. GRB 060714: REM infrared observations
  68. GRB 060717, optical observation
  69. GRB 060717: Swift detection of a burst
  70. GRB 060714 : Liverpool Telescope Observations
  71. GRB 060708: VLT spectroscopy
  72. Swift trigger 219136 is probably not a GRB
  73. GRB 060714, optical observation
  74. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  75. GRB060712: P60 Observations
  76. GRB 060712: Swift/UVOT Upper Limits
  77. GRB 060712: XRT refined position
  78. GRB 060712: Refined analysis of the Swift-BAT burst
  79. GRB 060707: OA fading and redshift
  80. GCN 060708: Swift-UVOT Observations
  81. GCN 060707: Swift-UVOT observations
  82. GRB 060708: Swift detection of a burst with an UVOT countpart
  83. GRB 060707: Refined analysis of the Swift-BAT burst
  84. GRB 060515: Upper Limit on Host Galaxy
  85. GRB 060109: Upper Limit on Host Galaxy
  86. GRB 060105: Upper limit on Host Galaxy
  87. GRB 060614: Redshift
  88. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  89. GRB050326: Host Galaxy Candidates
  90. GRB050124: Possible Host Galaxy
  91. GRB050223: Host Galaxy
  92. Konus-Wind observation of GRB 060614
  93. GRB060605: optical observation
  94. GRB 060605, optical observations
  95. GRB060614: SSO 1m observations
  96. GRB 060614: Swift-BAT refined analysis
  97. GRB 060614: Swift/UVOT Observations
  98. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  99. GRB 060602A: Swift/XRT analysis
  100. GRB 060610: KAIT observations

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