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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"

28249 results found.

  1. GRB 061004, Swift BAT refined analysis
  2. GRB 061004: Swift detection of a burst
  3. GRB 060928: Suzaku/WAM observation of the prompt emission
  4. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  5. GRB 060928: Swift observations
  6. IPN triangulation of GRB060928 (long, exceptionally bright)
  7. GRB 060930: near-IR afterglow candidate
  8. GRB 061002: Swift-XRT Team Refined Analysis
  9. VLA observations of GRB 060926
  10. GRB061002 - SDSS Pre-Burst Observations
  11. GRB 061002, Swift-BAT refined analysis
  12. GRB 060908: Detection of a possible host
  13. GRB 060807: Detection of a possible host galaxy
  14. GRB 060923A: VLA K-band Observations
  15. GRB 060930: Xinglong TNT optical observations
  16. GRB 060929: Further XRT Refined Analysis
  17. GRB 060929: Swift/UVOT Optical Observations
  18. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  19. GRB060929: Swift-XRT refined analysis.
  20. GRB 060929: TNG K-band observations
  21. GRB 060929, Swift-BAT refined analysis
  22. GRB060929: Optical limit
  23. Liverpool Telescope observations of GRB 060929
  24. GRB060908: optical observations
  25. GRB 060927: Swift/UVOT Optical Observations
  26. GRB 060927: Swift XRT Team refined analysis
  27. GRB 060927 optical limit
  28. GRB 060927, Swift-BAT refined analysis
  29. GRB 060927: Xinglong TNT optical observations
  30. GRB 060927, optical observation
  31. GRB060927 - SDSS Pre-Burst Observations
  32. Swift XRT boresight
  33. GRB060926: VLT redshift
  34. GRB 060926: Swift-UVOT Detections
  35. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  36. GRB 060926, Swift-BAT refined analysis
  37. GRB 060923A: Radio Observations
  38. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  39. GRB 060926: Swift detection of a burst
  40. GRB 060923C, Swift-BAT refined analysis
  41. GRB 060923C: VLA Observation
  42. GRB 060923C: NIR afterglow confirmed
  43. GRB060923C: AROMA optical obsevation
  44. GRB 060923C, optical observation
  45. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  46. GRB 060923C: VLT J-band observations
  47. GRB 060923B: Swift XRT Refined Analysis
  48. GRB 060923A: Swift XRT refined analysis
  49. GRB 060923A: Keck and Gemini Observations
  50. GRB 060923C: Xinglong TNT optical observations
  51. GRB 060923B, Swift-BAT refined analysis
  52. GRB 060923C: Swift detection of a burst
  53. GRB 060923B: Swift detection of a burst
  54. GRB 060923, Swift-BAT refined analysis
  55. GRB 060923: UKIRT nIR observations - candidate afterglow
  56. GRB060923 - SDSS Pre-Burst Observations
  57. GRB 060923: Swift detection of a burst
  58. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  59. GRB 060919 : Faulkes South Telescope Observations
  60. GRB 060919, Swift-BAT refined analysis
  61. GRB060919: XRT refined analysis
  62. GRB 060919: TAROT optical observations
  63. GRB 060919: Swift detection of a burst
  64. GRB 060912A: VLA Observation
  65. GRB 060912A: Probable Host Galaxy
  66. GRB 060912, Swift-BAT refined analysis
  67. GRB 060912: Correction to GCN 5559
  68. GRB 060912: Swift detection of a burst with an optical afterglow
  69. VLA observations of GRB 060908
  70. GRB 060908, Swift-BAT refined analysis
  71. GRB 060908 - SDSS Pre-burst Observations
  72. GRB 060908: REM optical prompt observation
  73. GRB 060908: Swift detection of a burst with a bright optical counterpart
  74. GRB 060904A: Suzaku/WAM observation of the prompt emission
  75. GRB060906 , optical observation
  76. GRB 060906: Early RAPTOR optical limits
  77. GRB 060906, Swift-BAT refined spectral analysis
  78. GRB 060906: Swift/XRT Refined Analysis
  79. VLT redshift of GRB 060906
  80. GRB 060906, Swift-BAT refined analysis
  81. GRB 060906: Confirmation of P60 Optical Afterglow
  82. GRB 060906 (?): P60 Optical Afterglow Candidate
  83. GRB060904b, optical observations
  84. GRB060904A: Swift/UVOT optical observations
  85. GRB 060904A: Subaru NIR observation
  86. GRB 060904B: Swift-BAT refined analysis
  87. GRB 060904A: Refined analysis of the Swift-BAT burst
  88. GRB 060904A: Suzaku-XIS and -HXD observation plan
  89. GRB 060904A: P60 Observations
  90. GRB 060904B: Optical observations at Crni Vrh
  91. GRB 060904B: TAROT optical counterpart observations
  92. GRB060904B - SDSS Pre-Burst Observations
  93. GRB 060904: TAROT optical observations
  94. GRB 060904B: Swift detection of a burst with optical counterpart
  95. GRB060904 - SDSS Pre-Burst Observations
  96. GRB 060904: Swift detection of a bright burst
  97. GRB060901: Optical observations
  98. 060901: Swift UVOT followup observations
  99. GRB 060901: Swift/XRT Refined Analysis
  100. GRB 060901: Swift/XRT Position

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