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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"

27124 results found.

  1. GRB 060927: Swift/UVOT Optical Observations
  2. GRB 060927: Early color
  3. GRB 060927: Swift XRT Team refined analysis
  4. GRB 060927, Swift-BAT refined analysis
  5. GRB060927: Faulkes Telescope South observation
  6. GRB060927 - SDSS Pre-Burst Observations
  7. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  8. GRB 060927: Swift detection of a burst
  9. GRB 060926: Swift-UVOT Detections
  10. GRB 060926, Swift-BAT refined analysis
  11. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  12. GRB 060926: Swift detection of a burst
  13. GRB 060923C, Swift-BAT refined analysis
  14. GRB060923B: Swift/UVOT upper limits
  15. GRB 060923C, Swift-BAT partial refined analysis
  16. GRB 060923C: Keck Observations
  17. GRB 060923A: Keck and Gemini Observations
  18. GRB 060923B, Swift-BAT refined analysis
  19. GRB060923C : Faulkes Telescope South optical limits
  20. GRB060923C: Faulkes Telescope North optical observations
  21. GRB 060923C: optical observation
  22. GRB 060923C: Swift detection of a burst
  23. GRB 060923B: Swift detection of a burst
  24. GRB 060923, Swift-BAT refined analysis
  25. GRB 060923: Early Super-LOTIS Observations
  26. GRB060923: Faulkes Telescope North optical observations
  27. GRB060923 - SDSS Pre-Burst Observations
  28. GRB 060923: KAIT observations
  29. GRB 060923: Swift detection of a burst
  30. Swift detection of IGR J17497-2821 (trigger 230504)
  31. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  32. GRB 060919, Swift-BAT refined analysis
  33. GRB060919: XRT refined analysis
  34. GRB 060919: TAROT optical observations
  35. GRB 060919: Swift detection of a burst
  36. Konus-Wind observation of GRB 060912
  37. GRB060912: Swift/UVOT Observations
  38. GRB 060912: Swift XRT Team Refined Analysis
  39. GRB 060912, Swift-BAT refined analysis
  40. GRB 060912: Swift detection of a burst with an optical afterglow
  41. GRB 060908, Swift/XRT refined analysis
  42. GRB 060908: Swift/UVOT Observations
  43. GRB 060908: Danish/DFOSC optical observations
  44. GRB 060908, Swift-BAT refined analysis
  45. GRB 060908 - SDSS Pre-burst Observations
  46. GRB 060908: PROMPT Detection of a Bright Counterpart
  47. GRB 060908: Swift detection of a burst with a bright optical counterpart
  48. GRB 060904A: Suzaku/WAM observation of the prompt emission
  49. GRB060904b optical detections (delayed report due to internet outage)
  50. GRB 060906: optical observation
  51. GRB 060906: Early RAPTOR optical limits
  52. GRB 060906, Swift-BAT refined spectral analysis
  53. GRB 060906: Swift/XRT Refined Analysis
  54. GRB 060906: Swift-UVOT observations
  55. GRB 060906, Swift-BAT refined analysis
  56. GRB 060906: KAIT observations
  57. GRB 060906 (?): P60 Optical Afterglow Candidate
  58. GRB 060906: Swift detection of a probable burst
  59. GRB 060904B: RTT150 optical observations
  60. GRB060904A: Swift/UVOT optical observations
  61. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  62. GRB 060904B: Swift-BAT refined analysis
  63. GRB060904b: Optical observations with Swift/UVOT
  64. Konus-Wind observation of GRB 060904A
  65. GRB 060904B: Swift-XRT refined analysis
  66. GRB 060904A: Refined analysis of the Swift-BAT burst
  67. GRB 060904A: Swift-XRT refined analysis
  68. GRB 060904B: Optical observations at Crni Vrh
  69. GRB 060904B: TAROT optical counterpart observations
  70. GRB060904B - SDSS Pre-Burst Observations
  71. GRB 060904: TAROT optical observations
  72. GRB 060904B: Swift detection of a burst with optical counterpart
  73. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  74. GRB060904 - SDSS Pre-Burst Observations
  75. GRB 060904: Swift detection of a bright burst
  76. GRB 060901: Swift/XRT Refined Analysis
  77. Two bright bursts from SGR 1806-20 detected with IBAS
  78. GRB 060814: Suzaku/WAM observation of the prompt emission
  79. Swift-BAT trigger 226614 is not a GRB
  80. GRB060826 - SDSS Pre-Burst Observations
  81. GRB 060826(?): Swift detection of a possible burst
  82. GRB 060825: XRT Team Refined Analysis
  83. GRB 060825: Swift-BAT Refined Analysis
  84. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  85. GRB060825: Liverpool Telescope optical observations
  86. GRB 060825: TAROT optical observations
  87. GRB 060825: Swift detection of a burst
  88. GRB060814: Break in the XRT light curve
  89. GRB060813: Break in the XRT light curve
  90. GRB 060813: A long, bright GRB detected with Suzaku WAM
  91. Konus-Wind observation of GRB 060814
  92. GRB 060814: Refined analysis of the Swift-BAT burst
  93. GRB060814: Swift/UVOT upper limits
  94. GRB 060814: Swift XRT refined analysis
  95. GRB 060814 - SDSS Pre-Burst Observations
  96. GRB 060814: TAROT optical observations
  97. GRB 060814: Swift detection of a bright burst
  98. Konus-Wind observation of GRB 060813
  99. GRB060813: Swift/UVOT upper limits
  100. GRB 060813: Swift XRT refined analysis

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