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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

26354 results found.

  1. GRB 061006: Swift-XRT Team Refined Analysis
  2. GRB061006 (Swift 232585) might be a short-hard GRB
  3. GRB 060930: near-IR afterglow candidate retraction
  4. GRB 061004: Optical afterglow candidate and redshift
  5. GRB 061004: Swift-XRT Team Refined Analysis
  6. GRB 061004, Swift BAT refined analysis
  7. GRB 061004: Swift detection of a burst
  8. GRB 060928: Suzaku/WAM observation of the prompt emission
  9. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  10. GRB 060928: Swift observations
  11. IPN triangulation of GRB060928 (long, exceptionally bright)
  12. GRB 060930: near-IR afterglow candidate
  13. GRB 061002: Swift-XRT Team Refined Analysis
  14. VLA observations of GRB 060926
  15. GRB061002 - SDSS Pre-Burst Observations
  16. GRB 061002, Swift-BAT refined analysis
  17. GRB 060908: Detection of a possible host
  18. GRB 060807: Detection of a possible host galaxy
  19. GRB 060923A: VLA K-band Observations
  20. GRB 060930: Xinglong TNT optical observations
  21. GRB 060929: Further XRT Refined Analysis
  22. GRB 060929: Swift/UVOT Optical Observations
  23. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  24. GRB060929: Swift-XRT refined analysis.
  25. GRB 060929: TNG K-band observations
  26. GRB 060929, Swift-BAT refined analysis
  27. GRB060929: Optical limit
  28. Liverpool Telescope observations of GRB 060929
  29. GRB060908: optical observations
  30. GRB 060927: Swift/UVOT Optical Observations
  31. GRB 060927: Swift XRT Team refined analysis
  32. GRB 060927 optical limit
  33. GRB 060927, Swift-BAT refined analysis
  34. GRB 060927: Xinglong TNT optical observations
  35. GRB 060927, optical observation
  36. GRB060927 - SDSS Pre-Burst Observations
  37. Swift XRT boresight
  38. GRB060926: VLT redshift
  39. GRB 060926: Swift-UVOT Detections
  40. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  41. GRB 060926, Swift-BAT refined analysis
  42. GRB 060923A: Radio Observations
  43. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  44. GRB 060926: Swift detection of a burst
  45. GRB 060923C, Swift-BAT refined analysis
  46. GRB 060923C: VLA Observation
  47. GRB 060923C: NIR afterglow confirmed
  48. GRB060923C: AROMA optical obsevation
  49. GRB 060923C, optical observation
  50. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  51. GRB 060923C: VLT J-band observations
  52. GRB 060923B: Swift XRT Refined Analysis
  53. GRB 060923A: Swift XRT refined analysis
  54. GRB 060923A: Keck and Gemini Observations
  55. GRB 060923C: Xinglong TNT optical observations
  56. GRB 060923B, Swift-BAT refined analysis
  57. GRB 060923C: Swift detection of a burst
  58. GRB 060923B: Swift detection of a burst
  59. GRB 060923, Swift-BAT refined analysis
  60. GRB 060923: UKIRT nIR observations - candidate afterglow
  61. GRB060923 - SDSS Pre-Burst Observations
  62. GRB 060923: Swift detection of a burst
  63. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  64. GRB 060919 : Faulkes South Telescope Observations
  65. GRB 060919, Swift-BAT refined analysis
  66. GRB060919: XRT refined analysis
  67. GRB 060919: TAROT optical observations
  68. GRB 060919: Swift detection of a burst
  69. GRB 060912A: VLA Observation
  70. GRB 060912A: Probable Host Galaxy
  71. GRB 060912, Swift-BAT refined analysis
  72. GRB 060912: Correction to GCN 5559
  73. GRB 060912: Swift detection of a burst with an optical afterglow
  74. VLA observations of GRB 060908
  75. GRB 060908, Swift-BAT refined analysis
  76. GRB 060908 - SDSS Pre-burst Observations
  77. GRB 060908: REM optical prompt observation
  78. GRB 060908: Swift detection of a burst with a bright optical counterpart
  79. GRB 060904A: Suzaku/WAM observation of the prompt emission
  80. GRB060906 , optical observation
  81. GRB 060906: Early RAPTOR optical limits
  82. GRB 060906, Swift-BAT refined spectral analysis
  83. GRB 060906: Swift/XRT Refined Analysis
  84. VLT redshift of GRB 060906
  85. GRB 060906, Swift-BAT refined analysis
  86. GRB 060906: Confirmation of P60 Optical Afterglow
  87. GRB 060906 (?): P60 Optical Afterglow Candidate
  88. GRB060904b, optical observations
  89. GRB060904A: Swift/UVOT optical observations
  90. GRB 060904A: Subaru NIR observation
  91. GRB 060904B: Swift-BAT refined analysis
  92. GRB 060904A: Refined analysis of the Swift-BAT burst
  93. GRB 060904A: Suzaku-XIS and -HXD observation plan
  94. GRB 060904A: P60 Observations
  95. GRB 060904B: Optical observations at Crni Vrh
  96. GRB 060904B: TAROT optical counterpart observations
  97. GRB060904B - SDSS Pre-Burst Observations
  98. GRB 060904: TAROT optical observations
  99. GRB 060904B: Swift detection of a burst with optical counterpart
  100. GRB060904 - SDSS Pre-Burst Observations

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