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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"

36338 results found.

  1. Radio observations of GRB 060719
  2. GRB 060729, SMARTS optical/IR observations
  3. GRB060814: Break in the XRT light curve
  4. GRB060813: Break in the XRT light curve
  5. GRB 060813: A long, bright GRB detected with Suzaku WAM
  6. GRB 060814: Confirmation of IR afterglow
  7. Konus-Wind observation of GRB 060814
  8. GRB 060814: Refined analysis of the Swift-BAT burst
  9. GRB 060814: P60 Observations
  10. GRB 060814: P200 NIR Observations
  11. GRB 060814: source inside revised XRT error box
  12. GRB 060814: Possible IR counterpart
  13. GRB060805B: optical observations
  14. GRB060814: Swift/UVOT upper limits
  15. GRB 060813: pseudo-z from spectral parameters of the prompt
  16. GRB 060814: Swift XRT refined analysis
  17. GRB 060814: VLT optical limits
  18. GRB 060814 - SDSS Pre-Burst Observations
  19. GRB 060814: TAROT optical observations
  20. GRB 060814: Swift detection of a bright burst
  21. Konus-Wind observation of GRB 060813
  22. GRB060813: Swift/UVOT upper limits
  23. GRB 060813: Swift XRT refined analysis
  24. GRB 060813: Refined analysis of the Swift-BAT burst
  25. GRB 060813: Swift detection of a burst
  26. GRB051109B: Late-time Radio Observations
  27. Second VLA limit on new radio point source in SGR 1806-20
  28. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  29. GRB060714: optical observations
  30. IBAS Alert n. 3422: not a GRB
  31. GRB 060729: An update on the Swift XRT and UVOT observations
  32. GRB060717: optical observations
  33. GRB060807: Optical limiting magnitudes
  34. GRB 060805B: optical observation at Sierra Nevada
  35. GRB 060805B: XRT Team Analysis
  36. VLA Upper Limit on Outburst of SGR 1806-20
  37. GRB 060807: UVOT Upper limits
  38. GRB 060807: afterglow confirmation
  39. GRB 060807: XRT Team refined analysis
  40. GRB 060807: K- and R-band observations
  41. GRB 060807: Refined analysis of the Swift-BAT burst
  42. GRB060807: optical afterglow candidate
  43. GRB 060805B: RHESSI Spectral Fit
  44. GRB060807: optical upper limit in white light
  45. IPN triangulation of GRB060806 (long, exceptionally bright)
  46. GRB060807 - SDSS Pre-burst Observations
  47. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  48. GRB 060805B: Swift/UVOT Upper Limits
  49. GRB 060807, optical observation
  50. GRB 060807: Kanazawa R-band observation
  51. GRB 060807: optical limit
  52. GRB 060807: Swift detection of a burst
  53. GRB 060801: Second Epoch WSRT Radio Observations
  54. IPN triangulation of GRB060805B
  55. GRB 060805: optical upper limit in R
  56. GRB 060805: XRT Team Refined Analysis
  57. GRB 060805: Swift-BAT Refined Analysis
  58. GRB 060805: Swift/UVOT Upper Limits
  59. GRB 060805: P60 Observations
  60. GRB 060805: KAIT observations
  61. GRB 060805 - SDSS Pre-Burst Observations
  62. GRB 060805: Swift detection of a burst
  63. GRB 060804: Swift UVOT observations
  64. GRB 060804: Swift-XRT Team Refined Analysis
  65. GRB 060804: Refined analysis of the Swift-BAT burst
  66. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  67. GRB 060728: Upper limits of the X-ray emission
  68. GRB 060801: no variability of optical sources
  69. IBAS Alert 3418: not a GRB
  70. GRB 060801: WSRT Radio Observations
  71. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  72. GRB060801: Radio Observations
  73. GRB 051109B: Bright spiral host galaxy at low redshift
  74. GRB 060801: optical observations at FORS2/VLT
  75. GRB 060801: optical observations at Hanle and Calar Alto
  76. GRB060801: optical upper limit in R
  77. GRB 060801: Swift XRT refined analysis
  78. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  79. GRB 060801, optical observation
  80. GRB 060801: Kanazawa Optical Observation
  81. GRB 060801: Swift detection of a short burst
  82. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  83. GRB 060218 / SN 2006aj Nebular Spectrum
  84. IBAS Alert n. 3415: not a GRB
  85. Swift-BAT trigger 221873 is not a GRB or a Transient
  86. GRB 060729 redshift
  87. GRB 060719: TORTOREM optical upper limits
  88. GRB 060729: Swift/UVOT Detections
  89. GRB 060729: Refined analysis of the Swift-BAT burst
  90. GRB 060729: Swift-XRT refined analysis
  91. GRB 060729 : Planned XMM-Newton observation
  92. GRB 060729: Swift/UVOT Observations
  93. GRB 060729: ROTSE-III Detection of Optical Counterpart
  94. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  95. GRB 060728: Swift/UVOT Upper Limits
  96. GRB 060728: Refined analysis of the Swift-BAT burst
  97. GRB 060728, SMARTS optical/IR observations
  98. GRB 060728: Swift detection of a burst
  99. GRB060614 ATCA Radio Limits
  100. GRB 060218 (SN 2006aj): IR afterglow detection six months after the

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