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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. Swift trigger 377436 (possible GRB 091130A) is not a burst
  2. GRB 091130B: MASTER observations
  3. GRB 091130B: Swift detection of a burst
  4. GRB 091130: Swift detection of a possible burst
  5. GRB 091127: Radio observations
  6. Konus-Wind observation of GRB 091127
  7. GRB 091127: TAROT La Silla observatory optical observations
  8. GRB 091127: optical observations
  9. GRB 091127: Fermi GBM detection
  10. GRB 091127: Gemini-N redshift
  11. GRB 091127: Swift-XRT afterglow detection and analysis
  12. GRB 091127: TAROT La Silla observatory optical decay
  13. GRB 091127: Swift/UVOT observations
  14. GRB 091127: Swift-BAT refined analysis
  15. GRB 091127 : GROND observations
  16. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  17. GRB 091127: Liverpool Telescope afterglow candidate
  18. GRB 091127: Swift detection of a burst
  19. GRB 091117A: Suzaku WAM observation of the prompt emission
  20. GRB 091117A: Swift/UVOT followup observations
  21. GRB 091117: Swift-XRT observations
  22. GRB 091117 BAT refined analysis
  23. GRB 091117: Evidence for Variability of XRT Source #1
  24. GRB 091117: Swift XRT refined analysis
  25. GRB 091117: Gemini-North spectroscopy of DSS galaxy
  26. Konus-Wind observations of GRB 091117A
  27. GRB 091117: XRT source coincident with a DSS galaxy
  28. GRB 091117A Detected in ground analysis of BAT data and IPN triangulation
  29. GRB 091112: Suzaku WAM observation of the prompt emission
  30. GRB 091102A: Suzaku WAM observation of the prompt emission
  31. GRB 091109B: Suzaku WAM observation of the prompt emission
  32. GRB091111: Swift XRT refined analysis
  33. GRB 091112: Swift-BAT refined analysis
  34. GRB 091112: Fermi GBM observation
  35. GRB 091112: Swift detection of a possible burst
  36. GRB 091109B: Swift/UVOT Upper Limits
  37. GRB 091109B: Swift-XRT Team refined analysis
  38. GRB 091109B: Swift-BAT refined analysis
  39. GRB 091109B: Enhanced Swift-XRT position
  40. GRB 091109B: ROTSE-III Optical Limits
  41. GRB 091109B: Swift detection of a short burst
  42. GRB 091109: Swift-XRT refined analysis
  43. GRB 091109: Swift/UVOT observations
  44. GRB 091109: Swift-BAT refined analysis
  45. GRB 091109: Enhanced Swift-XRT position
  46. GRB 091109: Swift detection of a burst with optical afterglow
  47. GRB 091029: Observations from Stardome Observatory
  48. GRB 091104: Swift-BAT refined analysis
  49. GRB 091104: Swift XRT Refined Analysis
  50. GRB 091104: Swift/UVOT Upper Limits
  51. GRB091026 : IRSF NIR upper limit
  52. GRB091102 : MOA optical upper limit
  53. GRB 091104: Enhanced Swift-XRT position
  54. GRB 091104: Swift detection of a burst
  55. GRB 091102 : Faulkes Telescope South Upper Limits
  56. GRB 091102A: Fermi GBM observation
  57. GRB 091102: Swift-XRT refined analysis
  58. GRB 091102: Swift/UVOT Upper Limits
  59. GRB 091102: GROND Upper Limits
  60. GRB 091102: Swift-BAT refined analysis
  61. GRB 091102: Swift/XRT localization
  62. GRB 091102: ROTSE-III Optical Limits
  63. GRB 091102: Swift/UVOT Finding Chart Observation
  64. GRB 091102: Swift detection of a burst
  65. GRB 091024: optical observations
  66. GRB 091024: Fermi LAT upper limits
  67. GRB 090920: Skynet/DSO Detection
  68. GRB091029: Swift/UVOT observations
  69. GRB 091029: Swift XRT refined analysis
  70. GRB 091029: Swift-BAT refined analysis
  71. GRB 091029: Enhanced Swift-XRT position
  72. GRB 091029: Skynet/PROMPT Observations of Peak and Fading
  73. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  74. GRB 091029: Swift detection of a burst with an optical counterpart
  75. A mistake in testing a new function in Swift
  76. GRB 091020: Fermi GBM observation
  77. GRB 091026: Suzaku WAM observation of the prompt emission
  78. GRB 091026: GROND Upper Limits
  79. GRB 091020: Late TLS detection
  80. GRB 091026: Swift-BAT refined analysis
  81. Radio afterglow detection from GRB 091020
  82. GRB 091026: Swift/UVOT Upper Limits
  83. GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
  84. GRB 091026: Swift-XRT refined analysis
  85. GRB 091026: Enhanced Swift-XRT position
  86. Konus-Wind and Konus-RF observations of GRB 091024
  87. GRB 091026: Updated Swift-XRT position
  88. GRB 091026: Swift detection of a Gamma Ray Burst
  89. Swift-BAT Triggers 373776-373778 are not real
  90. GRB091024 Swift/UVOT Upper Limits
  91. GRB 091024: TLS Upper Limit
  92. GRB 091020: Early TLS Multicolor detections, red afterglow
  93. GRB 091024: KAIT optical afterglow observations
  94. GRB 091024: Swift-BAT refined analysis
  95. Swift-BAT Triggers 373679-373684 are not real
  96. GRB 091024: Fermi GBM Observations
  97. GRB 091024: Swift-XRT team refined analysis
  98. Swift-BAT trigger 373691 is a galactic bulge transient
  99. GRB 091024 : Faulkes Telescope North - Afterglow Confirmation
  100. GRB 091024: Faulkes Telescope North Afterglow Candidate

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