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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"

19412 results found.

  1. GRB 061028: Swift/UVOT Observations
  2. GRB 061028, Swift-BAT refined analysis
  3. GRB 061028: TAROT Calern observatory optical observations
  4. GRB 061028: Swift detection of a burst
  5. GRB 061027, Swift refined analysis of a possible burst
  6. GRB 061027: Swift detection of a possible burst
  7. GRB061025: Swift XRT refined analysis
  8. GRB061025: Swift/UVOT observations
  9. GRB061025: Swift XRT position
  10. Swift XRT boresight update
  11. GRB 061021, Swift-BAT Lag analysis
  12. Konus-Wind observation of GRB 061021
  13. GRB 061021: Swift-XRT refined analysis
  14. GRB 061021: Swift/UVOT Observation
  15. GRB 061021, Swift-BAT refined analysis
  16. GRB 061021: Swift detection of a burst
  17. GRB 061019: Super-LOTIS upper limit
  18. GRB 061019: SARA upper limit
  19. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  20. GRB 061019: Swift/UVOT upper limit
  21. GRB061019: Swift XRT refined analysis
  22. GRB 061019, Swift-BAT refined analysis
  23. GRB 061019: TAROT La Silla observatory optical observations
  24. GRB061019: Swift/XRT position
  25. GRB 061019: Swift-BAT detection of a burst
  26. GRB 061006: astrometry-corrected XRT position
  27. Konus-Wind observation of GRB 061007
  28. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  29. GRB061007: Swift UVOT followup observations
  30. GRB 061007: Magellan Spectroscopy
  31. GRB 061007: Correction to GCN 5712
  32. GRB 061007: Swift-BAT refined analysis
  33. GRB 061007: Swift XRT refined analysis
  34. GRB 061006: Swift/UVOT optical observations
  35. Konus-Wind observation of the short hard GRB 061006
  36. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  37. GRB 061007: Swift detection of a burst with an optical counterpart
  38. GRB 061007: ROTSE-III Detection of Optical Counterpart
  39. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  40. GRB 061006: Swift-XRT Team Refined Analysis
  41. GRB061006 (Swift 232585) might be a short-hard GRB
  42. GRB061006: Faulkes Telescope South Observations
  43. GRB 061006: Swift detection of a burst
  44. GRB061004: Swift/UVOT optical observations
  45. GRB 061004: Swift-XRT Team Refined Analysis
  46. GRB 061004, Swift BAT refined analysis
  47. GRB 061004: Swift detection of a burst
  48. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  49. GRB 060928: Swift observations
  50. IPN triangulation of GRB060928 (long, exceptionally bright)
  51. GRB061002: Swift UVOT followup observations
  52. GRB 061002: Swift-XRT Team Refined Analysis
  53. GRB 061002, Swift-BAT refined analysis
  54. GRB061002: MASTER-VWF-Kislovodsk observations
  55. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  56. GRB 061002: Swift detection of a burst
  57. GRB 060929: Further XRT Refined Analysis
  58. GRB 060929: Swift/UVOT Optical Observations
  59. GRB060929: Swift-XRT refined analysis.
  60. GRB 060929, Swift-BAT further refined analysis - late-time flare
  61. GRB 060929, Swift-BAT refined analysis
  62. GRB 060929: BART observation
  63. GRB 060929: MASTER-VWF-Kislovodsk observations
  64. GRB 060929: BOOTES-IR & OSN observations
  65. Liverpool Telescope observations of GRB 060929
  66. GRB 060929: Swift detection of a burst
  67. GRB 060729: An update on the late-time Swift observations
  68. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  69. GRB 060927: pseudo-z from spectral parameters of the prompt emission
  70. GRB 060927: Swift/UVOT Optical Observations
  71. GRB 060927: Swift XRT Team refined analysis
  72. GRB 060927, Swift-BAT refined analysis
  73. GRB060927: Faulkes Telescope South observation
  74. GRB060927 - SDSS Pre-Burst Observations
  75. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  76. Swift XRT boresight
  77. GRB 060927: Swift detection of a burst
  78. GRB060926: VLT redshift
  79. GRB 060926: Swift-UVOT Detections
  80. GRB 060926: Swift XRT refined analysis
  81. GRB 060926, Swift-BAT refined analysis
  82. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  83. GRB 060926: BOOTES-IR observations
  84. GRB060926 OPTIMA-Burst optical observation
  85. GRB 060926: Swift detection of a burst
  86. GRB 060923C, Swift-BAT refined analysis
  87. GRB 060923C: VLA Observation
  88. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  89. GRB060923B: Swift/UVOT upper limits
  90. GRB 060923B: Swift XRT Refined Analysis
  91. GRB 060923C: Swift XRT refined analysis
  92. GRB 060923C, Swift-BAT partial refined analysis
  93. GRB 060923A: Swift XRT refined analysis
  94. GRB 060923A: Keck and Gemini Observations
  95. GRB 060923B, Swift-BAT refined analysis
  96. GRB060923C : Faulkes Telescope South optical limits
  97. GRB060923C: Faulkes Telescope North optical observations
  98. GRB 060923C: Swift detection of a burst
  99. GRB 060923B: Swift detection of a burst
  100. GRB 060923, Swift-BAT refined analysis

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