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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"

19662 results found.

  1. GRB 091130B: MASTER observations
  2. GRB 091130B: Swift detection of a burst
  3. GRB 091130: Swift detection of a possible burst
  4. GRB 091127: Radio observations
  5. Konus-Wind observation of GRB 091127
  6. GRB 091127: TAROT La Silla observatory optical observations
  7. GRB 091127: optical observations
  8. GRB 091127: Fermi GBM detection
  9. GRB 091127: Gemini-N redshift
  10. GRB 091127: Swift-XRT afterglow detection and analysis
  11. GRB 091127: TAROT La Silla observatory optical decay
  12. GRB 091127: Swift/UVOT observations
  13. GRB 091127: Swift-BAT refined analysis
  14. GRB 091127 : GROND observations
  15. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  16. GRB 091127: Liverpool Telescope afterglow candidate
  17. GRB 091127: Swift detection of a burst
  18. GRB 091117A: Suzaku WAM observation of the prompt emission
  19. GRB 091117A: Swift/UVOT followup observations
  20. GRB 091117: Swift-XRT observations
  21. GRB 091117 BAT refined analysis
  22. GRB 091117: Evidence for Variability of XRT Source #1
  23. GRB 091117: Swift XRT refined analysis
  24. GRB 091117: Gemini-North spectroscopy of DSS galaxy
  25. Konus-Wind observations of GRB 091117A
  26. GRB 091117: XRT source coincident with a DSS galaxy
  27. GRB 091117A Detected in ground analysis of BAT data and IPN triangulation
  28. GRB 091112: Suzaku WAM observation of the prompt emission
  29. GRB 091102A: Suzaku WAM observation of the prompt emission
  30. GRB 091109B: Suzaku WAM observation of the prompt emission
  31. GRB091111: Swift XRT refined analysis
  32. GRB 091112: Swift-BAT refined analysis
  33. GRB 091112: Fermi GBM observation
  34. GRB 091112: Swift detection of a possible burst
  35. GRB 091109B: Swift/UVOT Upper Limits
  36. GRB 091109B: Swift-XRT Team refined analysis
  37. GRB 091109B: Swift-BAT refined analysis
  38. GRB 091109B: Enhanced Swift-XRT position
  39. GRB 091109B: ROTSE-III Optical Limits
  40. GRB 091109B: Swift detection of a short burst
  41. GRB 091109: Swift-XRT refined analysis
  42. GRB 091109: Swift/UVOT observations
  43. GRB 091109: Swift-BAT refined analysis
  44. GRB 091109: Enhanced Swift-XRT position
  45. GRB 091109: Swift detection of a burst with optical afterglow
  46. GRB 091029: Observations from Stardome Observatory
  47. GRB 091104: Swift-BAT refined analysis
  48. GRB 091104: Swift XRT Refined Analysis
  49. GRB 091104: Swift/UVOT Upper Limits
  50. GRB091026 : IRSF NIR upper limit
  51. GRB091102 : MOA optical upper limit
  52. GRB 091104: Enhanced Swift-XRT position
  53. GRB 091104: Swift detection of a burst
  54. GRB 091102 : Faulkes Telescope South Upper Limits
  55. GRB 091102A: Fermi GBM observation
  56. GRB 091102: Swift-XRT refined analysis
  57. GRB 091102: Swift/UVOT Upper Limits
  58. GRB 091102: GROND Upper Limits
  59. GRB 091102: Swift-BAT refined analysis
  60. GRB 091102: Swift/XRT localization
  61. GRB 091102: ROTSE-III Optical Limits
  62. GRB 091102: Swift/UVOT Finding Chart Observation
  63. GRB 091102: Swift detection of a burst
  64. GRB 091024: optical observations
  65. GRB 091024: Fermi LAT upper limits
  66. GRB 090920: Skynet/DSO Detection
  67. GRB091029: Swift/UVOT observations
  68. GRB 091029: Swift XRT refined analysis
  69. GRB 091029: Swift-BAT refined analysis
  70. GRB 091029: Enhanced Swift-XRT position
  71. GRB 091029: Skynet/PROMPT Observations of Peak and Fading
  72. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  73. GRB 091029: Swift detection of a burst with an optical counterpart
  74. A mistake in testing a new function in Swift
  75. GRB 091020: Fermi GBM observation
  76. GRB 091026: Suzaku WAM observation of the prompt emission
  77. GRB 091026: GROND Upper Limits
  78. GRB 091020: Late TLS detection
  79. GRB 091026: Swift-BAT refined analysis
  80. Radio afterglow detection from GRB 091020
  81. GRB 091026: Swift/UVOT Upper Limits
  82. GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
  83. GRB 091026: Swift-XRT refined analysis
  84. GRB 091026: Enhanced Swift-XRT position
  85. Konus-Wind and Konus-RF observations of GRB 091024
  86. GRB 091026: Updated Swift-XRT position
  87. GRB 091026: Swift detection of a Gamma Ray Burst
  88. Swift-BAT Triggers 373776-373778 are not real
  89. GRB091024 Swift/UVOT Upper Limits
  90. GRB 091024: TLS Upper Limit
  91. GRB 091020: Early TLS Multicolor detections, red afterglow
  92. GRB 091024: KAIT optical afterglow observations
  93. GRB 091024: Swift-BAT refined analysis
  94. Swift-BAT Triggers 373679-373684 are not real
  95. GRB 091024: Fermi GBM Observations
  96. GRB 091024: Swift-XRT team refined analysis
  97. Swift-BAT trigger 373691 is a galactic bulge transient
  98. GRB 091024 : Faulkes Telescope North - Afterglow Confirmation
  99. GRB 091024: Faulkes Telescope North Afterglow Candidate
  100. GRB 091024: Swift detection of a burst

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