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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"

19535 results found.

  1. GRB 061110B: Swift detection of a burst
  2. GRB 061110: ROTSE-III Optical Limits
  3. GRB 061110: Swift detection of a burst
  4. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  5. GRB 061109: TAROT Calern observatory optical observations
  6. GRB 061109: Swift detection of a possible burst
  7. GRB061028: MAGIC telescope GeV observation
  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. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  13. GRB061102B: Super-LOTIS observations
  14. GRB 061028: Optical R passband observations
  15. GRB 061102B: Swift detection of a possible burst
  16. GRB 061102, Swift-BAT refined analysis
  17. GRB 061102: Swift detection of a burst
  18. GRB 061028: VLA Observation
  19. GRB 061004: Swift/XRT Astrometry Correction
  20. GRB 060801: Swift/XRT Astrometry Correction
  21. GRB 061028: MDM Observations
  22. GRB 061028: SARA upper limit
  23. GRB061028: XRT refined analysis
  24. GRB 061028: Swift/UVOT Observations
  25. GRB 061028, Swift-BAT refined analysis
  26. GRB 061028: TAROT Calern observatory optical observations
  27. GRB 061028: Swift detection of a burst
  28. GRB 061027, Swift refined analysis of a possible burst
  29. GRB 061027: Swift detection of a possible burst
  30. GRB061025: Swift XRT refined analysis
  31. GRB061025: Swift/UVOT observations
  32. GRB061025: Swift XRT position
  33. Swift XRT boresight update
  34. GRB 061021, Swift-BAT Lag analysis
  35. Konus-Wind observation of GRB 061021
  36. GRB 061021: Swift-XRT refined analysis
  37. GRB 061021: Swift/UVOT Observation
  38. GRB 061021, Swift-BAT refined analysis
  39. GRB 061021: Swift detection of a burst
  40. GRB 061019: Super-LOTIS upper limit
  41. GRB 061019: SARA upper limit
  42. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  43. GRB 061019: Swift/UVOT upper limit
  44. GRB061019: Swift XRT refined analysis
  45. GRB 061019, Swift-BAT refined analysis
  46. GRB 061019: TAROT La Silla observatory optical observations
  47. GRB061019: Swift/XRT position
  48. GRB 061019: Swift-BAT detection of a burst
  49. GRB 061006: astrometry-corrected XRT position
  50. Konus-Wind observation of GRB 061007
  51. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  52. GRB061007: Swift UVOT followup observations
  53. GRB 061007: Magellan Spectroscopy
  54. GRB 061007: Correction to GCN 5712
  55. GRB 061007: Swift-BAT refined analysis
  56. GRB 061007: Swift XRT refined analysis
  57. GRB 061006: Swift/UVOT optical observations
  58. Konus-Wind observation of the short hard GRB 061006
  59. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  60. GRB 061007: Swift detection of a burst with an optical counterpart
  61. GRB 061007: ROTSE-III Detection of Optical Counterpart
  62. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  63. GRB 061006: Swift-XRT Team Refined Analysis
  64. GRB061006 (Swift 232585) might be a short-hard GRB
  65. GRB061006: Faulkes Telescope South Observations
  66. GRB 061006: Swift detection of a burst
  67. GRB061004: Swift/UVOT optical observations
  68. GRB 061004: Swift-XRT Team Refined Analysis
  69. GRB 061004, Swift BAT refined analysis
  70. GRB 061004: Swift detection of a burst
  71. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  72. GRB 060928: Swift observations
  73. IPN triangulation of GRB060928 (long, exceptionally bright)
  74. GRB061002: Swift UVOT followup observations
  75. GRB 061002: Swift-XRT Team Refined Analysis
  76. GRB 061002, Swift-BAT refined analysis
  77. GRB061002: MASTER-VWF-Kislovodsk observations
  78. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  79. GRB 061002: Swift detection of a burst
  80. GRB 060929: Further XRT Refined Analysis
  81. GRB 060929: Swift/UVOT Optical Observations
  82. GRB060929: Swift-XRT refined analysis.
  83. GRB 060929, Swift-BAT further refined analysis - late-time flare
  84. GRB 060929, Swift-BAT refined analysis
  85. GRB 060929: BART observation
  86. GRB 060929: MASTER-VWF-Kislovodsk observations
  87. GRB 060929: BOOTES-IR & OSN observations
  88. Liverpool Telescope observations of GRB 060929
  89. GRB 060929: Swift detection of a burst
  90. GRB 060729: An update on the late-time Swift observations
  91. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  92. GRB 060927: pseudo-z from spectral parameters of the prompt emission
  93. GRB 060927: Swift/UVOT Optical Observations
  94. GRB 060927: Swift XRT Team refined analysis
  95. GRB 060927, Swift-BAT refined analysis
  96. GRB060927: Faulkes Telescope South observation
  97. GRB060927 - SDSS Pre-Burst Observations
  98. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  99. Swift XRT boresight
  100. GRB 060927: Swift detection of a burst

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