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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"

28056 results found.

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

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