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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

19663 results found.

  1. IPN triangulation of GRB060928 (long, exceptionally bright)
  2. GRB061002: Swift UVOT followup observations
  3. GRB 061002: Swift-XRT Team Refined Analysis
  4. GRB 061002, Swift-BAT refined analysis
  5. GRB061002: MASTER-VWF-Kislovodsk observations
  6. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  7. GRB 061002: Swift detection of a burst
  8. GRB 060929: Further XRT Refined Analysis
  9. GRB 060929: Swift/UVOT Optical Observations
  10. GRB060929: Swift-XRT refined analysis.
  11. GRB 060929, Swift-BAT further refined analysis - late-time flare
  12. GRB 060929, Swift-BAT refined analysis
  13. GRB 060929: BART observation
  14. GRB 060929: MASTER-VWF-Kislovodsk observations
  15. GRB 060929: BOOTES-IR & OSN observations
  16. Liverpool Telescope observations of GRB 060929
  17. GRB 060929: Swift detection of a burst
  18. GRB 060729: An update on the late-time Swift observations
  19. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  20. GRB 060927: pseudo-z from spectral parameters of the prompt emission
  21. GRB 060927: Swift/UVOT Optical Observations
  22. GRB 060927: Swift XRT Team refined analysis
  23. GRB 060927, Swift-BAT refined analysis
  24. GRB060927: Faulkes Telescope South observation
  25. GRB060927 - SDSS Pre-Burst Observations
  26. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  27. Swift XRT boresight
  28. GRB 060927: Swift detection of a burst
  29. GRB060926: VLT redshift
  30. GRB 060926: Swift-UVOT Detections
  31. GRB 060926: Swift XRT refined analysis
  32. GRB 060926, Swift-BAT refined analysis
  33. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  34. GRB 060926: BOOTES-IR observations
  35. GRB060926 OPTIMA-Burst optical observation
  36. GRB 060926: Swift detection of a burst
  37. GRB 060923C, Swift-BAT refined analysis
  38. GRB 060923C: VLA Observation
  39. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  40. GRB060923B: Swift/UVOT upper limits
  41. GRB 060923B: Swift XRT Refined Analysis
  42. GRB 060923C: Swift XRT refined analysis
  43. GRB 060923C, Swift-BAT partial refined analysis
  44. GRB 060923A: Swift XRT refined analysis
  45. GRB 060923A: Keck and Gemini Observations
  46. GRB 060923B, Swift-BAT refined analysis
  47. GRB060923C : Faulkes Telescope South optical limits
  48. GRB060923C: Faulkes Telescope North optical observations
  49. GRB 060923C: Swift detection of a burst
  50. GRB 060923B: Swift detection of a burst
  51. GRB 060923, Swift-BAT refined analysis
  52. GRB 060923: Early Super-LOTIS Observations
  53. GRB060923: Faulkes Telescope North optical observations
  54. GRB 060923: KAIT observations
  55. GRB 060923: Swift detection of a burst
  56. Swift detection of IGR J17497-2821 (trigger 230504)
  57. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  58. GRB060919: Swift/UVOT optical observations
  59. GRB 060919, Swift-BAT refined analysis
  60. GRB060919: XRT refined analysis
  61. GRB 060919: TAROT optical observations
  62. GRB 060919: Swift detection of a burst
  63. GRB 060912A: VLA Observation
  64. GRB060825: MAGIC telescope GeV observation
  65. Konus-Wind observation of GRB 060912
  66. GRB060912: Swift/UVOT Observations
  67. GRB060912: OPTIMA-Burst optical observations
  68. GRB 060912: Swift XRT Team Refined Analysis
  69. GRB 060912, Swift-BAT refined analysis
  70. GRB 060912: Swift detection of a burst with an optical afterglow
  71. VLA observations of GRB 060908
  72. GRB 060908, Swift/XRT refined analysis
  73. GRB 060908: Swift/UVOT Observations
  74. GRB 060908, Swift-BAT refined analysis
  75. GRB 060908 - SDSS Pre-burst Observations
  76. GRB 060908: Swift detection of a burst with a bright optical counterpart
  77. GRB 060904A: Suzaku/WAM observation of the prompt emission
  78. GRB060904b optical detections (delayed report due to internet outage)
  79. GRB 060906: Early RAPTOR optical limits
  80. GRB 060906, Swift-BAT refined spectral analysis
  81. GRB 060906: Swift/XRT Refined Analysis
  82. GRB 060906: Swift-UVOT observations
  83. VLT redshift of GRB 060906
  84. GRB 060906, Swift-BAT refined analysis
  85. GRB 060906: KAIT observations
  86. GRB 060906 (?): P60 Optical Afterglow Candidate
  87. GRB 060906: Swift detection of a probable burst
  88. GRB 060904A Milagro GeV/TeV Observations
  89. GRB060904A: Swift/UVOT optical observations
  90. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  91. GRB 060904B: Swift-BAT refined analysis
  92. GRB060904b: Optical observations with Swift/UVOT
  93. Konus-Wind observation of GRB 060904A
  94. GRB 060904B: Swift-XRT refined analysis
  95. GRB 060904A: Refined analysis of the Swift-BAT burst
  96. GRB 060904A: Swift-XRT refined analysis
  97. GRB 060904A: Suzaku-XIS and -HXD observation plan
  98. GRB 060904B: Optical observations at Crni Vrh
  99. GRB060904B: Watcher observations
  100. GRB 060904B BOOTES-IR and 1.5m OSN observations

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