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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"

28280 results found.

  1. GRB 060908, Swift-BAT refined analysis
  2. GRB 060908 - SDSS Pre-burst Observations
  3. GRB 060908: REM optical prompt observation
  4. GRB 060908: Swift detection of a burst with a bright optical counterpart
  5. GRB 060904A: Suzaku/WAM observation of the prompt emission
  6. GRB060906 , optical observation
  7. GRB 060906: Early RAPTOR optical limits
  8. GRB 060906, Swift-BAT refined spectral analysis
  9. GRB 060906: Swift/XRT Refined Analysis
  10. VLT redshift of GRB 060906
  11. GRB 060906, Swift-BAT refined analysis
  12. GRB 060906: Confirmation of P60 Optical Afterglow
  13. GRB 060906 (?): P60 Optical Afterglow Candidate
  14. GRB060904b, optical observations
  15. GRB060904A: Swift/UVOT optical observations
  16. GRB 060904A: Subaru NIR observation
  17. GRB 060904B: Swift-BAT refined analysis
  18. GRB 060904A: Refined analysis of the Swift-BAT burst
  19. GRB 060904A: Suzaku-XIS and -HXD observation plan
  20. GRB 060904A: P60 Observations
  21. GRB 060904B: Optical observations at Crni Vrh
  22. GRB 060904B: TAROT optical counterpart observations
  23. GRB060904B - SDSS Pre-Burst Observations
  24. GRB 060904: TAROT optical observations
  25. GRB 060904B: Swift detection of a burst with optical counterpart
  26. GRB060904 - SDSS Pre-Burst Observations
  27. GRB 060904: Swift detection of a bright burst
  28. GRB060901: Optical observations
  29. 060901: Swift UVOT followup observations
  30. GRB 060901: Swift/XRT Refined Analysis
  31. GRB 060901: Swift/XRT Position
  32. GRB 060901: a long GRB detected by INTEGRAL
  33. Two bright bursts from SGR 1806-20 detected with IBAS
  34. GRB 060605, observations using an Integral Field Unit
  35. GRB 060604: VLA Observation
  36. GRB 060814: Suzaku/WAM observation of the prompt emission
  37. GRB 060605: VLA Observation
  38. GRB 060707: VLA observation
  39. GRB 060825: VLA observations
  40. GRB060826 - SDSS Pre-Burst Observations
  41. GRB 060826(?): Swift detection of a possible burst
  42. GRB 060825: XRT Team Refined Analysis
  43. GRB 060825: Swift-BAT Refined Analysis
  44. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  45. GRB 060825: TNG optical observations
  46. GRB 060825: TAROT optical observations
  47. GRB 060825: P60 Observations
  48. GRB 060825: Swift detection of a burst
  49. GRB060801: host galaxy redshift
  50. GRB060729: analysis of XMM-Newton observation
  51. GRB 060729, SMARTS optical/IR observations
  52. GRB 060813: A long, bright GRB detected with Suzaku WAM
  53. Konus-Wind observation of GRB 060814
  54. GRB 060814: Refined analysis of the Swift-BAT burst
  55. GRB 060814: P60 Observations
  56. GRB 060814: P200 NIR Observations
  57. GRB060805B: optical observations
  58. GRB 060814: Swift XRT refined analysis
  59. GRB 060814: VLT optical limits
  60. GRB 060814 - SDSS Pre-Burst Observations
  61. GRB 060814: TAROT optical observations
  62. GRB 060814: Swift detection of a bright burst
  63. Konus-Wind observation of GRB 060813
  64. GRB 060813: Swift XRT refined analysis
  65. GRB 060813: Refined analysis of the Swift-BAT burst
  66. GRB 060813: Swift detection of a burst
  67. GRB051109B: Late-time Radio Observations
  68. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  69. GRB060807: Possible Highly Significant X-ray Emission Lines
  70. GRB 060729: An update on the Swift XRT and UVOT observations
  71. GRB060717: optical observations
  72. GRB060807: Optical limiting magnitudes
  73. GRB 060805B: XRT Team Analysis
  74. GRB060806 is similar to previous activity of SGR1806-20
  75. GRB 060807: XRT Team refined analysis
  76. GRB 060807: Refined analysis of the Swift-BAT burst
  77. GRB060807: optical afterglow candidate
  78. IPN triangulation of GRB060806 (long, exceptionally bright)
  79. GRB060807 - SDSS Pre-burst Observations
  80. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  81. GRB 060805B: Swift/UVOT Upper Limits
  82. GRB 060807, optical observation
  83. GRB 060807: Kanazawa R-band observation
  84. GRB 060807: Swift detection of a burst
  85. GRB060805 Liverpool Telescope observations
  86. GRB 060805: XRT Team Refined Analysis
  87. GRB 060805: Swift-BAT Refined Analysis
  88. GRB 060805: Swift/UVOT Upper Limits
  89. GRB 060805: P60 Observations
  90. GRB 060805 - SDSS Pre-Burst Observations
  91. GRB 060804: Swift UVOT observations
  92. GRB 060804: Swift-XRT Team Refined Analysis
  93. GRB 060804: Refined analysis of the Swift-BAT burst
  94. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  95. GRB 060728: Upper limits of the X-ray emission
  96. GRB 060801: no variability of optical sources
  97. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  98. GRB060801: Radio Observations
  99. GRB 051109B: Bright spiral host galaxy at low redshift
  100. GRB060801: Swift/UVOT Upper Limits

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