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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"

19419 results found.

  1. GRB 061102: Swift detection of a burst
  2. GRB 061028: VLA Observation
  3. GRB 061004: Swift/XRT Astrometry Correction
  4. GRB 060801: Swift/XRT Astrometry Correction
  5. GRB 061028: MDM Observations
  6. GRB 061028: SARA upper limit
  7. GRB061028: XRT refined analysis
  8. GRB 061028: Swift/UVOT Observations
  9. GRB 061028, Swift-BAT refined analysis
  10. GRB 061028: TAROT Calern observatory optical observations
  11. GRB 061028: Swift detection of a burst
  12. GRB 061027, Swift refined analysis of a possible burst
  13. GRB 061027: Swift detection of a possible burst
  14. GRB061025: Swift XRT refined analysis
  15. GRB061025: Swift/UVOT observations
  16. GRB061025: Swift XRT position
  17. Swift XRT boresight update
  18. GRB 061021, Swift-BAT Lag analysis
  19. Konus-Wind observation of GRB 061021
  20. GRB 061021: Swift-XRT refined analysis
  21. GRB 061021: Swift/UVOT Observation
  22. GRB 061021, Swift-BAT refined analysis
  23. GRB 061021: Swift detection of a burst
  24. GRB 061019: Super-LOTIS upper limit
  25. GRB 061019: SARA upper limit
  26. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  27. GRB 061019: Swift/UVOT upper limit
  28. GRB061019: Swift XRT refined analysis
  29. GRB 061019, Swift-BAT refined analysis
  30. GRB 061019: TAROT La Silla observatory optical observations
  31. GRB061019: Swift/XRT position
  32. GRB 061019: Swift-BAT detection of a burst
  33. GRB 061006: astrometry-corrected XRT position
  34. Konus-Wind observation of GRB 061007
  35. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  36. GRB061007: Swift UVOT followup observations
  37. GRB 061007: Magellan Spectroscopy
  38. GRB 061007: Correction to GCN 5712
  39. GRB 061007: Swift-BAT refined analysis
  40. GRB 061007: Swift XRT refined analysis
  41. GRB 061006: Swift/UVOT optical observations
  42. Konus-Wind observation of the short hard GRB 061006
  43. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  44. GRB 061007: Swift detection of a burst with an optical counterpart
  45. GRB 061007: ROTSE-III Detection of Optical Counterpart
  46. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  47. GRB 061006: Swift-XRT Team Refined Analysis
  48. GRB061006 (Swift 232585) might be a short-hard GRB
  49. GRB061006: Faulkes Telescope South Observations
  50. GRB 061006: Swift detection of a burst
  51. GRB061004: Swift/UVOT optical observations
  52. GRB 061004: Swift-XRT Team Refined Analysis
  53. GRB 061004, Swift BAT refined analysis
  54. GRB 061004: Swift detection of a burst
  55. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  56. GRB 060928: Swift observations
  57. IPN triangulation of GRB060928 (long, exceptionally bright)
  58. GRB061002: Swift UVOT followup observations
  59. GRB 061002: Swift-XRT Team Refined Analysis
  60. GRB 061002, Swift-BAT refined analysis
  61. GRB061002: MASTER-VWF-Kislovodsk observations
  62. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  63. GRB 061002: Swift detection of a burst
  64. GRB 060929: Further XRT Refined Analysis
  65. GRB 060929: Swift/UVOT Optical Observations
  66. GRB060929: Swift-XRT refined analysis.
  67. GRB 060929, Swift-BAT further refined analysis - late-time flare
  68. GRB 060929, Swift-BAT refined analysis
  69. GRB 060929: BART observation
  70. GRB 060929: MASTER-VWF-Kislovodsk observations
  71. GRB 060929: BOOTES-IR & OSN observations
  72. Liverpool Telescope observations of GRB 060929
  73. GRB 060929: Swift detection of a burst
  74. GRB 060729: An update on the late-time Swift observations
  75. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  76. GRB 060927: pseudo-z from spectral parameters of the prompt emission
  77. GRB 060927: Swift/UVOT Optical Observations
  78. GRB 060927: Swift XRT Team refined analysis
  79. GRB 060927, Swift-BAT refined analysis
  80. GRB060927: Faulkes Telescope South observation
  81. GRB060927 - SDSS Pre-Burst Observations
  82. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  83. Swift XRT boresight
  84. GRB 060927: Swift detection of a burst
  85. GRB060926: VLT redshift
  86. GRB 060926: Swift-UVOT Detections
  87. GRB 060926: Swift XRT refined analysis
  88. GRB 060926, Swift-BAT refined analysis
  89. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  90. GRB 060926: BOOTES-IR observations
  91. GRB060926 OPTIMA-Burst optical observation
  92. GRB 060926: Swift detection of a burst
  93. GRB 060923C, Swift-BAT refined analysis
  94. GRB 060923C: VLA Observation
  95. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  96. GRB060923B: Swift/UVOT upper limits
  97. GRB 060923B: Swift XRT Refined Analysis
  98. GRB 060923C: Swift XRT refined analysis
  99. GRB 060923C, Swift-BAT partial refined analysis
  100. GRB 060923A: Swift XRT refined analysis

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