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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"

19670 results found.

  1. GRB 091130B: Swift-XRT team refined analysis
  2. GRB 091130B: Swift-BAT refined analysis
  3. GRB 091130B: Swift/UVOT Upper Limits
  4. GRB 091127: Skynet/PROMPT Observations of Fading
  5. GRB 091130B: Enhanced Swift-XRT position
  6. Swift trigger 377436 (possible GRB 091130A) is not a burst
  7. GRB 091130B: MASTER observations
  8. GRB 091130B: Swift detection of a burst
  9. GRB 091130: Swift detection of a possible burst
  10. GRB 091127: Radio observations
  11. Konus-Wind observation of GRB 091127
  12. GRB 091127: TAROT La Silla observatory optical observations
  13. GRB 091127: optical observations
  14. GRB 091127: Fermi GBM detection
  15. GRB 091127: Gemini-N redshift
  16. GRB 091127: Swift-XRT afterglow detection and analysis
  17. GRB 091127: TAROT La Silla observatory optical decay
  18. GRB 091127: Swift/UVOT observations
  19. GRB 091127: Swift-BAT refined analysis
  20. GRB 091127 : GROND observations
  21. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  22. GRB 091127: Liverpool Telescope afterglow candidate
  23. GRB 091127: Swift detection of a burst
  24. GRB 091117A: Suzaku WAM observation of the prompt emission
  25. GRB 091117A: Swift/UVOT followup observations
  26. GRB 091117: Swift-XRT observations
  27. GRB 091117 BAT refined analysis
  28. GRB 091117: Evidence for Variability of XRT Source #1
  29. GRB 091117: Swift XRT refined analysis
  30. GRB 091117: Gemini-North spectroscopy of DSS galaxy
  31. Konus-Wind observations of GRB 091117A
  32. GRB 091117: XRT source coincident with a DSS galaxy
  33. GRB 091117A Detected in ground analysis of BAT data and IPN triangulation
  34. GRB 091112: Suzaku WAM observation of the prompt emission
  35. GRB 091102A: Suzaku WAM observation of the prompt emission
  36. GRB 091109B: Suzaku WAM observation of the prompt emission
  37. GRB091111: Swift XRT refined analysis
  38. GRB 091112: Swift-BAT refined analysis
  39. GRB 091112: Fermi GBM observation
  40. GRB 091112: Swift detection of a possible burst
  41. GRB 091109B: Swift/UVOT Upper Limits
  42. GRB 091109B: Swift-XRT Team refined analysis
  43. GRB 091109B: Swift-BAT refined analysis
  44. GRB 091109B: Enhanced Swift-XRT position
  45. GRB 091109B: ROTSE-III Optical Limits
  46. GRB 091109B: Swift detection of a short burst
  47. GRB 091109: Swift-XRT refined analysis
  48. GRB 091109: Swift/UVOT observations
  49. GRB 091109: Swift-BAT refined analysis
  50. GRB 091109: Enhanced Swift-XRT position
  51. GRB 091109: Swift detection of a burst with optical afterglow
  52. GRB 091029: Observations from Stardome Observatory
  53. GRB 091104: Swift-BAT refined analysis
  54. GRB 091104: Swift XRT Refined Analysis
  55. GRB 091104: Swift/UVOT Upper Limits
  56. GRB091026 : IRSF NIR upper limit
  57. GRB091102 : MOA optical upper limit
  58. GRB 091104: Enhanced Swift-XRT position
  59. GRB 091104: Swift detection of a burst
  60. GRB 091102 : Faulkes Telescope South Upper Limits
  61. GRB 091102A: Fermi GBM observation
  62. GRB 091102: Swift-XRT refined analysis
  63. GRB 091102: Swift/UVOT Upper Limits
  64. GRB 091102: GROND Upper Limits
  65. GRB 091102: Swift-BAT refined analysis
  66. GRB 091102: Swift/XRT localization
  67. GRB 091102: ROTSE-III Optical Limits
  68. GRB 091102: Swift/UVOT Finding Chart Observation
  69. GRB 091102: Swift detection of a burst
  70. GRB 091024: optical observations
  71. GRB 091024: Fermi LAT upper limits
  72. GRB 090920: Skynet/DSO Detection
  73. GRB091029: Swift/UVOT observations
  74. GRB 091029: Swift XRT refined analysis
  75. GRB 091029: Swift-BAT refined analysis
  76. GRB 091029: Enhanced Swift-XRT position
  77. GRB 091029: Skynet/PROMPT Observations of Peak and Fading
  78. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  79. GRB 091029: Swift detection of a burst with an optical counterpart
  80. A mistake in testing a new function in Swift
  81. GRB 091020: Fermi GBM observation
  82. GRB 091026: Suzaku WAM observation of the prompt emission
  83. GRB 091026: GROND Upper Limits
  84. GRB 091020: Late TLS detection
  85. GRB 091026: Swift-BAT refined analysis
  86. Radio afterglow detection from GRB 091020
  87. GRB 091026: Swift/UVOT Upper Limits
  88. GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
  89. GRB 091026: Swift-XRT refined analysis
  90. GRB 091026: Enhanced Swift-XRT position
  91. Konus-Wind and Konus-RF observations of GRB 091024
  92. GRB 091026: Updated Swift-XRT position
  93. GRB 091026: Swift detection of a Gamma Ray Burst
  94. Swift-BAT Triggers 373776-373778 are not real
  95. GRB091024 Swift/UVOT Upper Limits
  96. GRB 091024: TLS Upper Limit
  97. GRB 091020: Early TLS Multicolor detections, red afterglow
  98. GRB 091024: KAIT optical afterglow observations
  99. GRB 091024: Swift-BAT refined analysis
  100. Swift-BAT Triggers 373679-373684 are not real

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