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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"

28117 results found.

  1. GRB 061110: Candidate confirmed
  2. GRB 061110 : Optical afterglow candidate
  3. GRB 061110: ROTSE-III Optical Limits
  4. GRB 061110: Swift detection of a burst
  5. GRB061110A - Optical Non-detection
  6. GRB 061109: optical observation
  7. GRB 061109: TAROT Calern observatory optical observations
  8. GRB 061027: TAROT La Silla observatory optical observations
  9. GRB 061028: Swift/XRT Astrometry Correction
  10. GRB 061102: Swift/UVOT Magnitude Upper Limits
  11. GRB 061102, XRT refined analysis
  12. GRB061102B: Super-LOTIS observations
  13. GRB 061028: Optical R passband observations
  14. GRB 061102B: Swift detection of a possible burst
  15. GRB 061102, Swift-BAT refined analysis
  16. GRB 061102: Swift detection of a burst
  17. GRB 061028: VLA Observation
  18. GRB 061004: Swift/XRT Astrometry Correction
  19. GRB 060801: Swift/XRT Astrometry Correction
  20. GRB 061028: Futher P200 Observations
  21. GRB 061028: P200 Observations
  22. GRB 061028: SARA upper limit
  23. GRB 061028: z band imaging
  24. GRB061028: XRT refined analysis
  25. GRB 061028: Swift/UVOT Observations
  26. GRB 061028, Swift-BAT refined analysis
  27. GRB 061028: TAROT Calern observatory optical observations
  28. GRB 061028: Swift detection of a burst
  29. GRB 061027, Swift refined analysis of a possible burst
  30. GRB 061027: Swift detection of a possible burst
  31. GRB061025: Swift XRT refined analysis
  32. GRB061025: Swift/UVOT observations
  33. GRB 061025: REM observations
  34. GRB 061025: ROTSE-III Optical Limits
  35. GRB 061025: a long GRB detected by INTEGRAL
  36. Swift XRT boresight update
  37. GRB 061021: Swift/UVOT Observation
  38. GRB 061021, Swift-BAT refined analysis
  39. GRB 061021: Swift detection of a burst
  40. GRB061019: optical observations
  41. GRB 061019: SARA upper limit
  42. GRB 061019: Swift/UVOT upper limit
  43. GRB 061019: SMARTS afterglow confirmation
  44. GRB061019: Swift XRT refined analysis
  45. GRB 061019, Swift-BAT refined analysis
  46. GRB 061019: TAROT La Silla observatory optical observations
  47. GRB 061019: REM K-band candidate afterglow
  48. GRB 061007: Second Epoch ATCA Radio Observations
  49. GRB 061007: Suzaku/WAM observation of the prompt emission
  50. GRB 061006: astrometry-corrected XRT position
  51. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  52. GRB 061007: ATCA Radio Observations
  53. GRB061007: Swift UVOT followup observations
  54. GRB 061006: optical afterglow
  55. GRB 061007: OA fading and VLT redshift
  56. GRB 061007: Correction to GCN 5712
  57. GRB 061007: Swift-BAT refined analysis
  58. GRB 061007: Swift XRT refined analysis
  59. GRB 061006: Swift/UVOT optical observations
  60. GRB 061007: Swift detection of a burst with an optical counterpart
  61. GRB 061007: ROTSE-III Detection of Optical Counterpart
  62. GRB 061006: VLT observation
  63. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  64. GRB 061006: Swift-XRT Team Refined Analysis
  65. GRB061006 (Swift 232585) might be a short-hard GRB
  66. GRB 060930: near-IR afterglow candidate retraction
  67. GRB 061004: Optical afterglow candidate and redshift
  68. GRB 061004: Swift-XRT Team Refined Analysis
  69. GRB 061004, Swift BAT refined analysis
  70. GRB 061004: Swift detection of a burst
  71. GRB 060928: Suzaku/WAM observation of the prompt emission
  72. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  73. GRB 060928: Swift observations
  74. IPN triangulation of GRB060928 (long, exceptionally bright)
  75. GRB 060930: near-IR afterglow candidate
  76. GRB 061002: Swift-XRT Team Refined Analysis
  77. VLA observations of GRB 060926
  78. GRB061002 - SDSS Pre-Burst Observations
  79. GRB 061002, Swift-BAT refined analysis
  80. GRB 060908: Detection of a possible host
  81. GRB 060807: Detection of a possible host galaxy
  82. GRB 060923A: VLA K-band Observations
  83. GRB 060930: Xinglong TNT optical observations
  84. GRB 060929: Further XRT Refined Analysis
  85. GRB 060929: Swift/UVOT Optical Observations
  86. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  87. GRB060929: Swift-XRT refined analysis.
  88. GRB 060929: TNG K-band observations
  89. GRB 060929, Swift-BAT refined analysis
  90. GRB060929: Optical limit
  91. Liverpool Telescope observations of GRB 060929
  92. GRB060908: optical observations
  93. GRB 060927: Swift/UVOT Optical Observations
  94. GRB 060927: Swift XRT Team refined analysis
  95. GRB 060927 optical limit
  96. GRB 060927, Swift-BAT refined analysis
  97. GRB 060927: Xinglong TNT optical observations
  98. GRB 060927, optical observation
  99. GRB060927 - SDSS Pre-Burst Observations
  100. Swift XRT boresight

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