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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"

28238 results found.

  1. GRB 060908: Detection of a possible host
  2. GRB 060807: Detection of a possible host galaxy
  3. GRB 060923A: VLA K-band Observations
  4. GRB 060930: Xinglong TNT optical observations
  5. GRB 060929: Further XRT Refined Analysis
  6. GRB 060929: Swift/UVOT Optical Observations
  7. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  8. GRB060929: Swift-XRT refined analysis.
  9. GRB 060929: TNG K-band observations
  10. GRB 060929, Swift-BAT refined analysis
  11. GRB060929: Optical limit
  12. Liverpool Telescope observations of GRB 060929
  13. GRB060908: optical observations
  14. GRB 060927: Swift/UVOT Optical Observations
  15. GRB 060927: Swift XRT Team refined analysis
  16. GRB 060927 optical limit
  17. GRB 060927, Swift-BAT refined analysis
  18. GRB 060927: Xinglong TNT optical observations
  19. GRB 060927, optical observation
  20. GRB060927 - SDSS Pre-Burst Observations
  21. Swift XRT boresight
  22. GRB060926: VLT redshift
  23. GRB 060926: Swift-UVOT Detections
  24. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  25. GRB 060926, Swift-BAT refined analysis
  26. GRB 060923A: Radio Observations
  27. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  28. GRB 060926: Swift detection of a burst
  29. GRB 060923C, Swift-BAT refined analysis
  30. GRB 060923C: VLA Observation
  31. GRB 060923C: NIR afterglow confirmed
  32. GRB060923C: AROMA optical obsevation
  33. GRB 060923C, optical observation
  34. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  35. GRB 060923C: VLT J-band observations
  36. GRB 060923B: Swift XRT Refined Analysis
  37. GRB 060923A: Swift XRT refined analysis
  38. GRB 060923A: Keck and Gemini Observations
  39. GRB 060923C: Xinglong TNT optical observations
  40. GRB 060923B, Swift-BAT refined analysis
  41. GRB 060923C: Swift detection of a burst
  42. GRB 060923B: Swift detection of a burst
  43. GRB 060923, Swift-BAT refined analysis
  44. GRB 060923: UKIRT nIR observations - candidate afterglow
  45. GRB060923 - SDSS Pre-Burst Observations
  46. GRB 060923: Swift detection of a burst
  47. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  48. GRB 060919 : Faulkes South Telescope Observations
  49. GRB 060919, Swift-BAT refined analysis
  50. GRB060919: XRT refined analysis
  51. GRB 060919: TAROT optical observations
  52. GRB 060919: Swift detection of a burst
  53. GRB 060912A: VLA Observation
  54. GRB 060912A: Probable Host Galaxy
  55. GRB 060912, Swift-BAT refined analysis
  56. GRB 060912: Correction to GCN 5559
  57. GRB 060912: Swift detection of a burst with an optical afterglow
  58. VLA observations of GRB 060908
  59. GRB 060908, Swift-BAT refined analysis
  60. GRB 060908 - SDSS Pre-burst Observations
  61. GRB 060908: REM optical prompt observation
  62. GRB 060908: Swift detection of a burst with a bright optical counterpart
  63. GRB 060904A: Suzaku/WAM observation of the prompt emission
  64. GRB060906 , optical observation
  65. GRB 060906: Early RAPTOR optical limits
  66. GRB 060906, Swift-BAT refined spectral analysis
  67. GRB 060906: Swift/XRT Refined Analysis
  68. VLT redshift of GRB 060906
  69. GRB 060906, Swift-BAT refined analysis
  70. GRB 060906: Confirmation of P60 Optical Afterglow
  71. GRB 060906 (?): P60 Optical Afterglow Candidate
  72. GRB060904b, optical observations
  73. GRB060904A: Swift/UVOT optical observations
  74. GRB 060904A: Subaru NIR observation
  75. GRB 060904B: Swift-BAT refined analysis
  76. GRB 060904A: Refined analysis of the Swift-BAT burst
  77. GRB 060904A: Suzaku-XIS and -HXD observation plan
  78. GRB 060904A: P60 Observations
  79. GRB 060904B: Optical observations at Crni Vrh
  80. GRB 060904B: TAROT optical counterpart observations
  81. GRB060904B - SDSS Pre-Burst Observations
  82. GRB 060904: TAROT optical observations
  83. GRB 060904B: Swift detection of a burst with optical counterpart
  84. GRB060904 - SDSS Pre-Burst Observations
  85. GRB 060904: Swift detection of a bright burst
  86. GRB060901: Optical observations
  87. 060901: Swift UVOT followup observations
  88. GRB 060901: Swift/XRT Refined Analysis
  89. GRB 060901: Swift/XRT Position
  90. GRB 060901: a long GRB detected by INTEGRAL
  91. Two bright bursts from SGR 1806-20 detected with IBAS
  92. GRB 060605, observations using an Integral Field Unit
  93. GRB 060604: VLA Observation
  94. GRB 060814: Suzaku/WAM observation of the prompt emission
  95. GRB 060605: VLA Observation
  96. GRB 060707: VLA observation
  97. GRB 060825: VLA observations
  98. GRB060826 - SDSS Pre-Burst Observations
  99. GRB 060826(?): Swift detection of a possible burst
  100. GRB 060825: XRT Team Refined Analysis

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