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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

19596 results found.

  1. GRB 061019: Super-LOTIS upper limit
  2. GRB 061019: SARA upper limit
  3. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  4. GRB 061019: Swift/UVOT upper limit
  5. GRB061019: Swift XRT refined analysis
  6. GRB 061019, Swift-BAT refined analysis
  7. GRB 061019: TAROT La Silla observatory optical observations
  8. GRB061019: Swift/XRT position
  9. GRB 061019: Swift-BAT detection of a burst
  10. GRB 061006: astrometry-corrected XRT position
  11. Konus-Wind observation of GRB 061007
  12. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  13. GRB061007: Swift UVOT followup observations
  14. GRB 061007: Magellan Spectroscopy
  15. GRB 061007: Correction to GCN 5712
  16. GRB 061007: Swift-BAT refined analysis
  17. GRB 061007: Swift XRT refined analysis
  18. GRB 061006: Swift/UVOT optical observations
  19. Konus-Wind observation of the short hard GRB 061006
  20. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  21. GRB 061007: Swift detection of a burst with an optical counterpart
  22. GRB 061007: ROTSE-III Detection of Optical Counterpart
  23. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  24. GRB 061006: Swift-XRT Team Refined Analysis
  25. GRB061006 (Swift 232585) might be a short-hard GRB
  26. GRB061006: Faulkes Telescope South Observations
  27. GRB 061006: Swift detection of a burst
  28. GRB061004: Swift/UVOT optical observations
  29. GRB 061004: Swift-XRT Team Refined Analysis
  30. GRB 061004, Swift BAT refined analysis
  31. GRB 061004: Swift detection of a burst
  32. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  33. GRB 060928: Swift observations
  34. IPN triangulation of GRB060928 (long, exceptionally bright)
  35. GRB061002: Swift UVOT followup observations
  36. GRB 061002: Swift-XRT Team Refined Analysis
  37. GRB 061002, Swift-BAT refined analysis
  38. GRB061002: MASTER-VWF-Kislovodsk observations
  39. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  40. GRB 061002: Swift detection of a burst
  41. GRB 060929: Further XRT Refined Analysis
  42. GRB 060929: Swift/UVOT Optical Observations
  43. GRB060929: Swift-XRT refined analysis.
  44. GRB 060929, Swift-BAT further refined analysis - late-time flare
  45. GRB 060929, Swift-BAT refined analysis
  46. GRB 060929: BART observation
  47. GRB 060929: MASTER-VWF-Kislovodsk observations
  48. GRB 060929: BOOTES-IR & OSN observations
  49. Liverpool Telescope observations of GRB 060929
  50. GRB 060929: Swift detection of a burst
  51. GRB 060729: An update on the late-time Swift observations
  52. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  53. GRB 060927: pseudo-z from spectral parameters of the prompt emission
  54. GRB 060927: Swift/UVOT Optical Observations
  55. GRB 060927: Swift XRT Team refined analysis
  56. GRB 060927, Swift-BAT refined analysis
  57. GRB060927: Faulkes Telescope South observation
  58. GRB060927 - SDSS Pre-Burst Observations
  59. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  60. Swift XRT boresight
  61. GRB 060927: Swift detection of a burst
  62. GRB060926: VLT redshift
  63. GRB 060926: Swift-UVOT Detections
  64. GRB 060926: Swift XRT refined analysis
  65. GRB 060926, Swift-BAT refined analysis
  66. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  67. GRB 060926: BOOTES-IR observations
  68. GRB060926 OPTIMA-Burst optical observation
  69. GRB 060926: Swift detection of a burst
  70. GRB 060923C, Swift-BAT refined analysis
  71. GRB 060923C: VLA Observation
  72. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  73. GRB060923B: Swift/UVOT upper limits
  74. GRB 060923B: Swift XRT Refined Analysis
  75. GRB 060923C: Swift XRT refined analysis
  76. GRB 060923C, Swift-BAT partial refined analysis
  77. GRB 060923A: Swift XRT refined analysis
  78. GRB 060923A: Keck and Gemini Observations
  79. GRB 060923B, Swift-BAT refined analysis
  80. GRB060923C : Faulkes Telescope South optical limits
  81. GRB060923C: Faulkes Telescope North optical observations
  82. GRB 060923C: Swift detection of a burst
  83. GRB 060923B: Swift detection of a burst
  84. GRB 060923, Swift-BAT refined analysis
  85. GRB 060923: Early Super-LOTIS Observations
  86. GRB060923: Faulkes Telescope North optical observations
  87. GRB 060923: KAIT observations
  88. GRB 060923: Swift detection of a burst
  89. Swift detection of IGR J17497-2821 (trigger 230504)
  90. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  91. GRB060919: Swift/UVOT optical observations
  92. GRB 060919, Swift-BAT refined analysis
  93. GRB060919: XRT refined analysis
  94. GRB 060919: TAROT optical observations
  95. GRB 060919: Swift detection of a burst
  96. GRB 060912A: VLA Observation
  97. GRB060825: MAGIC telescope GeV observation
  98. Konus-Wind observation of GRB 060912
  99. GRB060912: Swift/UVOT Observations
  100. GRB060912: OPTIMA-Burst optical observations

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