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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"

42869 results found.

  1. Konus-Wind observation of GRB 060813
  2. GRB060813: Swift/UVOT upper limits
  3. GRB 060813: Swift XRT refined analysis
  4. GRB 060813: Refined analysis of the Swift-BAT burst
  5. GRB 060813: Swift detection of a burst
  6. GRB051109B: Late-time Radio Observations
  7. Second VLA limit on new radio point source in SGR 1806-20
  8. A dust-scattering halo detected around SGR 1806-20
  9. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  10. GRB060807: Possible Highly Significant X-ray Emission Lines
  11. GRB060714: optical observations
  12. IBAS Alert n. 3422: not a GRB
  13. GRB 060729: An update on the Swift XRT and UVOT 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: K- and R-band observations
  22. GRB 060807: Refined analysis of the Swift-BAT burst
  23. GRB060807: optical afterglow candidate
  24. GRB060806 = SGR1806-20
  25. GRB 060805B: RHESSI Spectral Fit
  26. IPN triangulation of GRB060806 (long, exceptionally bright)
  27. GRB060807 - SDSS Pre-burst Observations
  28. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  29. GRB 060807: Kanazawa R-band observation
  30. GRB 060807: optical limit
  31. GRB 060807: Swift detection of a burst
  32. IPN triangulation of GRB060805B
  33. GRB060805 Liverpool Telescope observations
  34. GRB 060805: XRT Team Refined Analysis
  35. GRB 060805: Swift-BAT Refined Analysis
  36. GRB 060805: Swift/UVOT Upper Limits
  37. GRB 060805: P60 Observations
  38. GRB 060805: KAIT observations
  39. GRB 060805 - SDSS Pre-Burst Observations
  40. GRB 060805: Swift detection of a burst
  41. GRB 060804: Swift UVOT observations
  42. GRB 060804: Swift-XRT Team Refined Analysis
  43. GRB 060804: Refined analysis of the Swift-BAT burst
  44. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  45. GRB 060728: Upper limits of the X-ray emission
  46. GRB 060801: no variability of optical sources
  47. IBAS Alert 3418: not a GRB
  48. GRB 060801: WSRT Radio Observations
  49. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  50. GRB060801: Radio Observations
  51. GRB 051109B: Bright spiral host galaxy at low redshift
  52. GRB 060801: optical observations at FORS2/VLT
  53. GRB060801: Swift/UVOT Upper Limits
  54. GRB 060801: optical observations at Hanle and Calar Alto
  55. GRB 060801: Swift XRT refined analysis
  56. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  57. GRB 060801: Swift detection of a short burst
  58. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  59. GRB 060218 / SN 2006aj Nebular Spectrum
  60. IBAS Alert n. 3415: not a GRB
  61. GRB 060729 redshift
  62. GRB 060719: TORTOREM optical upper limits
  63. GRB 060729: Swift/UVOT Detections
  64. GRB 060729: Refined analysis of the Swift-BAT burst
  65. GRB 060729: Swift-XRT refined analysis
  66. GRB 060729: Swift/UVOT Observations
  67. GRB 060729: ROTSE-III Detection of Optical Counterpart
  68. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  69. GRB 060728: Swift/UVOT Upper Limits
  70. GRB 060728: Refined analysis of the Swift-BAT burst
  71. GRB 060728, SMARTS optical/IR observations
  72. Swift/XRT preliminary analysis
  73. GRB 060728: Swift detection of a burst
  74. GRB060614 ATCA Radio Limits
  75. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  76. GRB 060714: Swift/UVOT Observations
  77. GRB060719: prompt NIR observations with REM
  78. GRB 060714: NOT observations
  79. GRB 060719: near-infrared afterglow
  80. GRB 060719: correction to the coordinates reported in GCN 5347
  81. GRB 060522: VLA observation
  82. GRB 060719: Swift/UVOT Upper Limits
  83. GRB 060719: VLT/ISAAC observations
  84. GRB 060719: Refined analysis of the Swift-BAT burst
  85. GRB 060719: XRT refined analysis
  86. GRB 060719: further analysis of VLT observations
  87. GRB 060719: optical limit by Pi-of-the-Sky
  88. GRB060719: FRAM early follow-up limit
  89. GRB 060719: prompt PROMPT observations
  90. GRB060719: REM NIR Observations
  91. GRB 060719: Continued LCO optical observations
  92. GRB 060719: VLT observations
  93. GRB 060719: LCO optical observations
  94. GRB 060719: Swift detection of a burst
  95. GRB 060717: Swift XRT refined analysis
  96. GRB 060714: OA fading and a possible host detection
  97. GRB 060717: NOT observations
  98. GRB 060714: Refined analysis of the Swift-BAT burst
  99. GRB060717: Swift/UVOT upper limits
  100. GRB 060717: Swift XRT refined position

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