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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"

28116 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. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  5. GRB060807: Possible Highly Significant X-ray Emission Lines
  6. GRB 060729: An update on the Swift XRT and UVOT observations
  7. GRB060717: optical observations
  8. GRB060807: Optical limiting magnitudes
  9. GRB 060805B: XRT Team Analysis
  10. GRB060806 is similar to previous activity of SGR1806-20
  11. GRB 060807: XRT Team refined analysis
  12. GRB 060807: Refined analysis of the Swift-BAT burst
  13. GRB060807: optical afterglow candidate
  14. IPN triangulation of GRB060806 (long, exceptionally bright)
  15. GRB060807 - SDSS Pre-burst Observations
  16. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  17. GRB 060805B: Swift/UVOT Upper Limits
  18. GRB 060807, optical observation
  19. GRB 060807: Kanazawa R-band observation
  20. GRB 060807: Swift detection of a burst
  21. GRB060805 Liverpool Telescope observations
  22. GRB 060805: XRT Team Refined Analysis
  23. GRB 060805: Swift-BAT Refined Analysis
  24. GRB 060805: Swift/UVOT Upper Limits
  25. GRB 060805: P60 Observations
  26. GRB 060805 - SDSS Pre-Burst Observations
  27. GRB 060804: Swift UVOT observations
  28. GRB 060804: Swift-XRT Team Refined Analysis
  29. GRB 060804: Refined analysis of the Swift-BAT burst
  30. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  31. GRB 060728: Upper limits of the X-ray emission
  32. GRB 060801: no variability of optical sources
  33. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  34. GRB060801: Radio Observations
  35. GRB 051109B: Bright spiral host galaxy at low redshift
  36. GRB060801: Swift/UVOT Upper Limits
  37. GRB 060801: optical observations at Hanle and Calar Alto
  38. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  39. GRB 060801, optical observation
  40. GRB 060801: Kanazawa Optical Observation
  41. GRB 060719: TORTOREM optical upper limits
  42. GRB 060729: Refined analysis of the Swift-BAT burst
  43. GRB 060729: Swift-XRT refined analysis
  44. GRB 060729: Swift/UVOT Observations
  45. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  46. GRB 060728: Swift/UVOT Upper Limits
  47. GRB 060728, SMARTS optical/IR observations
  48. Swift/XRT preliminary analysis
  49. GRB 060728: Swift detection of a burst
  50. GRB 060714: Swift/UVOT Observations
  51. GRB060719: prompt NIR observations with REM
  52. GRB 060714: NOT observations
  53. GRB 060719: near-infrared afterglow
  54. GRB 060719: correction to the coordinates reported in GCN 5347
  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. GRB 060719: further analysis of VLT observations
  61. GRB060719: REM NIR Observations
  62. GRB 060719: VLT observations
  63. GRB 060719: LCO optical observations
  64. GRB 060719: Swift detection of a burst
  65. GRB 060717: Swift XRT refined analysis
  66. GRB 060714: Refined analysis of the Swift-BAT burst
  67. GRB060717: Swift/UVOT upper limits
  68. GRB 060717: Swift-BAT refined analysis
  69. GRB060717 - SDSS Pre-burst Observations
  70. GRB 060714: REM infrared observations
  71. GRB 060717, optical observation
  72. GRB 060714 : Liverpool Telescope Observations
  73. GRB 060714: Swift XRT refined analysis
  74. GRB 060708: VLT spectroscopy
  75. Swift trigger 219136 is probably not a GRB
  76. GRB 060714, optical observation
  77. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  78. GRB060712: P60 Observations
  79. GRB 060712: XRT refined analysis
  80. GRB 060712: Swift/UVOT Upper Limits
  81. GRB060526: optical observations
  82. GRB 060712: XRT refined position
  83. GRB 060712: Refined analysis of the Swift-BAT burst
  84. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  85. GRB 060707: OA fading and redshift
  86. GRB 060708: Swift-XRT refined analysis
  87. GCN 060708: Swift-UVOT Observations
  88. GRB 060708: Refined analysis of the Swift-BAT burst
  89. GCN 060707: Swift-UVOT observations
  90. GRB 060707: Swift-XRT refined analysis
  91. GRB 060708: Swift detection of a burst with an UVOT countpart
  92. GRB 060707: Refined analysis of the Swift-BAT burst
  93. GRB 060707: BOOTES-IR optical observation
  94. GRB 060515: Upper Limit on Host Galaxy
  95. GRB 060614: SMARTS host galaxy observations
  96. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  97. GRB 060109: Upper Limit on Host Galaxy
  98. GRB 060105: Upper limit on Host Galaxy
  99. GRB 060614: Redshift
  100. Trigger 215279: Swift detection of a possible burst (GRB 060619)

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