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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"

28120 results found.

  1. GRB 060927, optical observation
  2. GRB060927 - SDSS Pre-Burst Observations
  3. Swift XRT boresight
  4. GRB060926: VLT redshift
  5. GRB 060926: Swift-UVOT Detections
  6. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  7. GRB 060926, Swift-BAT refined analysis
  8. GRB 060923A: Radio Observations
  9. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  10. GRB 060926: Swift detection of a burst
  11. GRB 060923C, Swift-BAT refined analysis
  12. GRB 060923C: VLA Observation
  13. GRB 060923C: NIR afterglow confirmed
  14. GRB060923C: AROMA optical obsevation
  15. GRB 060923C, optical observation
  16. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  17. GRB 060923C: VLT J-band observations
  18. GRB 060923B: Swift XRT Refined Analysis
  19. GRB 060923A: Swift XRT refined analysis
  20. GRB 060923A: Keck and Gemini Observations
  21. GRB 060923C: Xinglong TNT optical observations
  22. GRB 060923B, Swift-BAT refined analysis
  23. GRB 060923C: Swift detection of a burst
  24. GRB 060923B: Swift detection of a burst
  25. GRB 060923, Swift-BAT refined analysis
  26. GRB 060923: UKIRT nIR observations - candidate afterglow
  27. GRB060923 - SDSS Pre-Burst Observations
  28. GRB 060923: Swift detection of a burst
  29. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  30. GRB 060919 : Faulkes South Telescope Observations
  31. GRB 060919, Swift-BAT refined analysis
  32. GRB060919: XRT refined analysis
  33. GRB 060919: TAROT optical observations
  34. GRB 060919: Swift detection of a burst
  35. GRB 060912A: VLA Observation
  36. GRB 060912A: Probable Host Galaxy
  37. GRB 060912, Swift-BAT refined analysis
  38. GRB 060912: Correction to GCN 5559
  39. GRB 060912: Swift detection of a burst with an optical afterglow
  40. VLA observations of GRB 060908
  41. GRB 060908, Swift-BAT refined analysis
  42. GRB 060908 - SDSS Pre-burst Observations
  43. GRB 060908: REM optical prompt observation
  44. GRB 060908: Swift detection of a burst with a bright optical counterpart
  45. GRB 060904A: Suzaku/WAM observation of the prompt emission
  46. GRB060906 , optical observation
  47. GRB 060906: Early RAPTOR optical limits
  48. GRB 060906, Swift-BAT refined spectral analysis
  49. GRB 060906: Swift/XRT Refined Analysis
  50. VLT redshift of GRB 060906
  51. GRB 060906, Swift-BAT refined analysis
  52. GRB 060906: Confirmation of P60 Optical Afterglow
  53. GRB 060906 (?): P60 Optical Afterglow Candidate
  54. GRB060904b, optical observations
  55. GRB060904A: Swift/UVOT optical observations
  56. GRB 060904A: Subaru NIR observation
  57. GRB 060904B: Swift-BAT refined analysis
  58. GRB 060904A: Refined analysis of the Swift-BAT burst
  59. GRB 060904A: Suzaku-XIS and -HXD observation plan
  60. GRB 060904A: P60 Observations
  61. GRB 060904B: Optical observations at Crni Vrh
  62. GRB 060904B: TAROT optical counterpart observations
  63. GRB060904B - SDSS Pre-Burst Observations
  64. GRB 060904: TAROT optical observations
  65. GRB 060904B: Swift detection of a burst with optical counterpart
  66. GRB060904 - SDSS Pre-Burst Observations
  67. GRB 060904: Swift detection of a bright burst
  68. GRB060901: Optical observations
  69. 060901: Swift UVOT followup observations
  70. GRB 060901: Swift/XRT Refined Analysis
  71. GRB 060901: Swift/XRT Position
  72. GRB 060901: a long GRB detected by INTEGRAL
  73. Two bright bursts from SGR 1806-20 detected with IBAS
  74. GRB 060605, observations using an Integral Field Unit
  75. GRB 060604: VLA Observation
  76. GRB 060814: Suzaku/WAM observation of the prompt emission
  77. GRB 060605: VLA Observation
  78. GRB 060707: VLA observation
  79. GRB 060825: VLA observations
  80. GRB060826 - SDSS Pre-Burst Observations
  81. GRB 060826(?): Swift detection of a possible burst
  82. GRB 060825: XRT Team Refined Analysis
  83. GRB 060825: Swift-BAT Refined Analysis
  84. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  85. GRB 060825: TNG optical observations
  86. GRB 060825: TAROT optical observations
  87. GRB 060825: P60 Observations
  88. GRB 060825: Swift detection of a burst
  89. GRB060801: host galaxy redshift
  90. GRB060729: analysis of XMM-Newton observation
  91. GRB 060729, SMARTS optical/IR observations
  92. GRB 060813: A long, bright GRB detected with Suzaku WAM
  93. Konus-Wind observation of GRB 060814
  94. GRB 060814: Refined analysis of the Swift-BAT burst
  95. GRB 060814: P60 Observations
  96. GRB 060814: P200 NIR Observations
  97. GRB060805B: optical observations
  98. GRB 060814: Swift XRT refined analysis
  99. GRB 060814: VLT optical limits
  100. GRB 060814 - SDSS Pre-Burst Observations

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