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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"

19670 results found.

  1. GRB 061004: Swift-XRT Team Refined Analysis
  2. GRB 061004, Swift BAT refined analysis
  3. GRB 061004: Swift detection of a burst
  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. GRB061002: Swift UVOT followup observations
  8. GRB 061002: Swift-XRT Team Refined Analysis
  9. GRB 061002, Swift-BAT refined analysis
  10. GRB061002: MASTER-VWF-Kislovodsk observations
  11. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  12. GRB 061002: Swift detection of a burst
  13. GRB 060929: Further XRT Refined Analysis
  14. GRB 060929: Swift/UVOT Optical Observations
  15. GRB060929: Swift-XRT refined analysis.
  16. GRB 060929, Swift-BAT further refined analysis - late-time flare
  17. GRB 060929, Swift-BAT refined analysis
  18. GRB 060929: BART observation
  19. GRB 060929: MASTER-VWF-Kislovodsk observations
  20. GRB 060929: BOOTES-IR & OSN observations
  21. Liverpool Telescope observations of GRB 060929
  22. GRB 060929: Swift detection of a burst
  23. GRB 060729: An update on the late-time Swift observations
  24. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  25. GRB 060927: pseudo-z from spectral parameters of the prompt emission
  26. GRB 060927: Swift/UVOT Optical Observations
  27. GRB 060927: Swift XRT Team refined analysis
  28. GRB 060927, Swift-BAT refined analysis
  29. GRB060927: Faulkes Telescope South observation
  30. GRB060927 - SDSS Pre-Burst Observations
  31. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  32. Swift XRT boresight
  33. GRB 060927: Swift detection of a burst
  34. GRB060926: VLT redshift
  35. GRB 060926: Swift-UVOT Detections
  36. GRB 060926: Swift XRT refined analysis
  37. GRB 060926, Swift-BAT refined analysis
  38. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  39. GRB 060926: BOOTES-IR observations
  40. GRB060926 OPTIMA-Burst optical observation
  41. GRB 060926: Swift detection of a burst
  42. GRB 060923C, Swift-BAT refined analysis
  43. GRB 060923C: VLA Observation
  44. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  45. GRB060923B: Swift/UVOT upper limits
  46. GRB 060923B: Swift XRT Refined Analysis
  47. GRB 060923C: Swift XRT refined analysis
  48. GRB 060923C, Swift-BAT partial refined analysis
  49. GRB 060923A: Swift XRT refined analysis
  50. GRB 060923A: Keck and Gemini Observations
  51. GRB 060923B, Swift-BAT refined analysis
  52. GRB060923C : Faulkes Telescope South optical limits
  53. GRB060923C: Faulkes Telescope North optical observations
  54. GRB 060923C: Swift detection of a burst
  55. GRB 060923B: Swift detection of a burst
  56. GRB 060923, Swift-BAT refined analysis
  57. GRB 060923: Early Super-LOTIS Observations
  58. GRB060923: Faulkes Telescope North optical observations
  59. GRB 060923: KAIT observations
  60. GRB 060923: Swift detection of a burst
  61. Swift detection of IGR J17497-2821 (trigger 230504)
  62. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  63. GRB060919: Swift/UVOT optical observations
  64. GRB 060919, Swift-BAT refined analysis
  65. GRB060919: XRT refined analysis
  66. GRB 060919: TAROT optical observations
  67. GRB 060919: Swift detection of a burst
  68. GRB 060912A: VLA Observation
  69. GRB060825: MAGIC telescope GeV observation
  70. Konus-Wind observation of GRB 060912
  71. GRB060912: Swift/UVOT Observations
  72. GRB060912: OPTIMA-Burst optical observations
  73. GRB 060912: Swift XRT Team Refined Analysis
  74. GRB 060912, Swift-BAT refined analysis
  75. GRB 060912: Swift detection of a burst with an optical afterglow
  76. VLA observations of GRB 060908
  77. GRB 060908, Swift/XRT refined analysis
  78. GRB 060908: Swift/UVOT Observations
  79. GRB 060908, Swift-BAT refined analysis
  80. GRB 060908 - SDSS Pre-burst Observations
  81. GRB 060908: Swift detection of a burst with a bright optical counterpart
  82. GRB 060904A: Suzaku/WAM observation of the prompt emission
  83. GRB060904b optical detections (delayed report due to internet outage)
  84. GRB 060906: Early RAPTOR optical limits
  85. GRB 060906, Swift-BAT refined spectral analysis
  86. GRB 060906: Swift/XRT Refined Analysis
  87. GRB 060906: Swift-UVOT observations
  88. VLT redshift of GRB 060906
  89. GRB 060906, Swift-BAT refined analysis
  90. GRB 060906: KAIT observations
  91. GRB 060906 (?): P60 Optical Afterglow Candidate
  92. GRB 060906: Swift detection of a probable burst
  93. GRB 060904A Milagro GeV/TeV Observations
  94. GRB060904A: Swift/UVOT optical observations
  95. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  96. GRB 060904B: Swift-BAT refined analysis
  97. GRB060904b: Optical observations with Swift/UVOT
  98. Konus-Wind observation of GRB 060904A
  99. GRB 060904B: Swift-XRT refined analysis
  100. GRB 060904A: Refined analysis of the Swift-BAT burst

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