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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"

19595 results found.

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

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