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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"

28086 results found.

  1. GRB061025: Swift/UVOT observations
  2. GRB 061025: REM observations
  3. GRB 061025: ROTSE-III Optical Limits
  4. GRB 061025: a long GRB detected by INTEGRAL
  5. Swift XRT boresight update
  6. GRB 061021: Swift/UVOT Observation
  7. GRB 061021, Swift-BAT refined analysis
  8. GRB 061021: Swift detection of a burst
  9. GRB061019: optical observations
  10. GRB 061019: SARA upper limit
  11. GRB 061019: Swift/UVOT upper limit
  12. GRB 061019: SMARTS afterglow confirmation
  13. GRB061019: Swift XRT refined analysis
  14. GRB 061019, Swift-BAT refined analysis
  15. GRB 061019: TAROT La Silla observatory optical observations
  16. GRB 061019: REM K-band candidate afterglow
  17. GRB 061007: Second Epoch ATCA Radio Observations
  18. GRB 061007: Suzaku/WAM observation of the prompt emission
  19. GRB 061006: astrometry-corrected XRT position
  20. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  21. GRB 061007: ATCA Radio Observations
  22. GRB061007: Swift UVOT followup observations
  23. GRB 061006: optical afterglow
  24. GRB 061007: OA fading and VLT redshift
  25. GRB 061007: Correction to GCN 5712
  26. GRB 061007: Swift-BAT refined analysis
  27. GRB 061007: Swift XRT refined analysis
  28. GRB 061006: Swift/UVOT optical observations
  29. GRB 061007: Swift detection of a burst with an optical counterpart
  30. GRB 061007: ROTSE-III Detection of Optical Counterpart
  31. GRB 061006: VLT observation
  32. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  33. GRB 061006: Swift-XRT Team Refined Analysis
  34. GRB061006 (Swift 232585) might be a short-hard GRB
  35. GRB 060930: near-IR afterglow candidate retraction
  36. GRB 061004: Optical afterglow candidate and redshift
  37. GRB 061004: Swift-XRT Team Refined Analysis
  38. GRB 061004, Swift BAT refined analysis
  39. GRB 061004: Swift detection of a burst
  40. GRB 060928: Suzaku/WAM observation of the prompt emission
  41. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  42. GRB 060928: Swift observations
  43. IPN triangulation of GRB060928 (long, exceptionally bright)
  44. GRB 060930: near-IR afterglow candidate
  45. GRB 061002: Swift-XRT Team Refined Analysis
  46. VLA observations of GRB 060926
  47. GRB061002 - SDSS Pre-Burst Observations
  48. GRB 061002, Swift-BAT refined analysis
  49. GRB 060908: Detection of a possible host
  50. GRB 060807: Detection of a possible host galaxy
  51. GRB 060923A: VLA K-band Observations
  52. GRB 060930: Xinglong TNT optical observations
  53. GRB 060929: Further XRT Refined Analysis
  54. GRB 060929: Swift/UVOT Optical Observations
  55. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  56. GRB060929: Swift-XRT refined analysis.
  57. GRB 060929: TNG K-band observations
  58. GRB 060929, Swift-BAT refined analysis
  59. GRB060929: Optical limit
  60. Liverpool Telescope observations of GRB 060929
  61. GRB060908: optical observations
  62. GRB 060927: Swift/UVOT Optical Observations
  63. GRB 060927: Swift XRT Team refined analysis
  64. GRB 060927 optical limit
  65. GRB 060927, Swift-BAT refined analysis
  66. GRB 060927: Xinglong TNT optical observations
  67. GRB 060927, optical observation
  68. GRB060927 - SDSS Pre-Burst Observations
  69. Swift XRT boresight
  70. GRB060926: VLT redshift
  71. GRB 060926: Swift-UVOT Detections
  72. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  73. GRB 060926, Swift-BAT refined analysis
  74. GRB 060923A: Radio Observations
  75. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  76. GRB 060926: Swift detection of a burst
  77. GRB 060923C, Swift-BAT refined analysis
  78. GRB 060923C: VLA Observation
  79. GRB 060923C: NIR afterglow confirmed
  80. GRB060923C: AROMA optical obsevation
  81. GRB 060923C, optical observation
  82. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  83. GRB 060923C: VLT J-band observations
  84. GRB 060923B: Swift XRT Refined Analysis
  85. GRB 060923A: Swift XRT refined analysis
  86. GRB 060923A: Keck and Gemini Observations
  87. GRB 060923C: Xinglong TNT optical observations
  88. GRB 060923B, Swift-BAT refined analysis
  89. GRB 060923C: Swift detection of a burst
  90. GRB 060923B: Swift detection of a burst
  91. GRB 060923, Swift-BAT refined analysis
  92. GRB 060923: UKIRT nIR observations - candidate afterglow
  93. GRB060923 - SDSS Pre-Burst Observations
  94. GRB 060923: Swift detection of a burst
  95. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  96. GRB 060919 : Faulkes South Telescope Observations
  97. GRB 060919, Swift-BAT refined analysis
  98. GRB060919: XRT refined analysis
  99. GRB 060919: TAROT optical observations
  100. GRB 060919: Swift detection of a burst

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