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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"

36190 results found.

  1. GRB 091102A: Suzaku WAM observation of the prompt emission
  2. GRB 091109B: Suzaku WAM observation of the prompt emission
  3. GRB091111: Swift XRT refined analysis
  4. Konus-Wind and Konus-RF observations of GRB 091031
  5. GRB 091112: Swift-BAT refined analysis
  6. GRB 091112: Fermi GBM observation
  7. GRB 091031: Fermi LAT detection of a faint burst
  8. GRB 091112: Swift detection of a possible burst
  9. GRB 091111: BOOTES-3 contemporaneous imaging
  10. GRB 091111: BOOTES-3 observations
  11. GRB 091111: a faint long GRB detected with INTEGRAL
  12. GRB 091109A: GROND and VLT observations
  13. GRB 091109B: Swift/UVOT Upper Limits
  14. GRB 091109B: VLT afterglow confirmation
  15. GRB 091109B: Swift-XRT Team refined analysis
  16. GRB 091109B: VLT observations
  17. GRB 091109b: Magellan Observations
  18. GRB 091109B: Swift-BAT refined analysis
  19. GRB 091109B: Enhanced Swift-XRT position
  20. GRB 091109B: Optical limits from Watcher
  21. GRB 091109B: ROTSE-III Optical Limits
  22. GRB 091109B: Swift detection of a short burst
  23. GRB 091030: Fermi GBM detection
  24. GRB 091109: Swift-XRT refined analysis
  25. GRB 091109: BOOTES-3 observations
  26. GRB 091109: Swift/UVOT observations
  27. GRB 091109: Faulkes Telescope South observations
  28. GRB 091109: Swift-BAT refined analysis
  29. GRB 091109: Enhanced Swift-XRT position
  30. GRB091109: REM detection of the NIR afterglow
  31. GRB 091109: Swift detection of a burst with optical afterglow
  32. GRB 091029: Observations from Stardome Observatory
  33. GRB 091104: Swift-BAT refined analysis
  34. GRB 091104: Swift XRT Refined Analysis
  35. GRB 091104: Swift/UVOT Upper Limits
  36. GRB 091104: Enhanced Swift-XRT position
  37. GRB 091104: Swift detection of a burst
  38. GRB 091102: LABOCA/APEX submm observations
  39. Fermi LAT Upper Limits on GRB 091010
  40. GRB 091102 : Faulkes Telescope South Upper Limits
  41. GRB 091102A: Fermi GBM observation
  42. GRB 091102: Swift-XRT refined analysis
  43. GRB 091102: Swift/UVOT Upper Limits
  44. GRB 091102: GROND Upper Limits
  45. GRB 091102: BOOTES-3 observations
  46. GRB 091102: Swift-BAT refined analysis
  47. GRB 091102: Swift/XRT localization
  48. GRB 091102: ROTSE-III Optical Limits
  49. GRB 091102: Swift/UVOT Finding Chart Observation
  50. GRB 091102: Swift detection of a burst
  51. GRB 091024: optical observations
  52. GRB 091031: Fermi GBM detection
  53. GRB 091024: Fermi LAT upper limits
  54. GRB 090926a, SMARTS optical/IR afterglow observations
  55. GRB 091018: Skynet/PROMPT Observations of Possible Host Galaxy
  56. GRB 091029, SMARTS optical/IR afterglow observations
  57. GRB 091018, SMARTS optical/IR afterglow observations
  58. GRB 090920: Skynet/DSO Detection
  59. GRB091029: Swift/UVOT observations
  60. GRB 091029: Skynet/PROMPT Continued Observations of Fading
  61. GRB 091029: Swift XRT refined analysis
  62. Fermi Gamma-ray Burst Monitor trigger 091028818 is not a GRB
  63. GRB 091029: BOOTES-3 observations
  64. GRB 091029: Swift-BAT refined analysis
  65. GRB 091029: Enhanced Swift-XRT position
  66. GRB091024 optical observations
  67. GRB 091029: Gemini-South Redshift
  68. GRB 091029: Skynet/PROMPT Observations of Peak and Fading
  69. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  70. GRB 091029: Swift detection of a burst with an optical counterpart
  71. GRB 091020: Fermi GBM observation
  72. GRB 091026: Suzaku WAM observation of the prompt emission
  73. GRB 091024: Keck/LRIS Spectroscopy
  74. GRB 091024: YNAO-GMG observations
  75. GRB 091026: GROND Upper Limits
  76. GRB 091020: Late TLS detection
  77. GRB 091026: Swift-BAT refined analysis
  78. Radio afterglow detection from GRB 091020
  79. GRB 091026: Swift/UVOT Upper Limits
  80. GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
  81. GRB 091026: Swift-XRT refined analysis
  82. GRB 091026: Enhanced Swift-XRT position
  83. Konus-Wind and Konus-RF observations of GRB 091024
  84. GRB 091026: Updated Swift-XRT position
  85. GRB 091026: Swift detection of a Gamma Ray Burst
  86. GRB 091020 : Xinglong TNT upper limit
  87. GRB091024 Swift/UVOT Upper Limits
  88. GRB 091024: TLS Upper Limit
  89. GRB 091020: Early TLS Multicolor detections, red afterglow
  90. GRB 091024: KAIT optical afterglow observations
  91. GRB 091024: Super-LOTIS early observations
  92. GRB 091024: Swift-BAT refined analysis
  93. GRB 091024: Fermi GBM Observations
  94. GRB 091024: Swift-XRT team refined analysis
  95. GRB 091024: Xinglong TNT optical observation
  96. GRB 091024 : Faulkes Telescope North - Afterglow Confirmation
  97. GRB 091024 Gemini-North redshift
  98. GRB 091024: GRAS004 optical observations
  99. GRB 091024: Faulkes Telescope North Afterglow Candidate
  100. GRB 091024: Swift detection of a burst

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