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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"

38614 results found.

  1. GRB 091117A Detected in ground analysis of BAT data and IPN triangulation
  2. GRB 091112: Suzaku WAM observation of the prompt emission
  3. GRB 091102A: Suzaku WAM observation of the prompt emission
  4. GRB 091109B: Suzaku WAM observation of the prompt emission
  5. GRB091111: Swift XRT refined analysis
  6. Konus-Wind and Konus-RF observations of GRB 091031
  7. GRB 091112: Fermi GBM observation
  8. GRB 091031: Fermi LAT detection of a faint burst
  9. GRB 091112: Swift detection of a possible burst
  10. GRB 091111: BOOTES-3 contemporaneous imaging
  11. GRB 091111: BOOTES-3 observations
  12. GRB 091111: a faint long GRB detected with INTEGRAL
  13. GRB 091109A: GROND and VLT observations
  14. GRB 091109B: Swift/UVOT Upper Limits
  15. GRB 091109B: VLT afterglow confirmation
  16. GRB 091109B: Swift-XRT Team refined analysis
  17. GRB 091109B: VLT observations
  18. GRB 091109b: Magellan Observations
  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. GRB091109: Correction to GCN 10139
  24. GRB 091030: Fermi GBM detection
  25. GRB 091109: Swift-XRT refined analysis
  26. GRB 091109: BOOTES-3 observations
  27. GRB 091109: Swift/UVOT observations
  28. GRB 091109: Faulkes Telescope South observations
  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 091104: Swift XRT Refined Analysis
  33. GRB 091104: Swift/UVOT Upper Limits
  34. GRB091026 : IRSF NIR upper limit
  35. GRB091102 : MOA optical upper limit
  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/XRT localization
  47. GRB 091102: ROTSE-III Optical Limits
  48. GRB 091102: Swift/UVOT Finding Chart Observation
  49. GRB 091102: Swift detection of a burst
  50. GRB 091024: optical observations
  51. GRB 091031: Fermi GBM detection
  52. GRB 091024: Fermi LAT upper limits
  53. GRB 090926a, SMARTS optical/IR afterglow observations
  54. GRB 091029, SMARTS optical/IR afterglow observations
  55. GRB 091018, SMARTS optical/IR afterglow observations
  56. GRB091029: Swift/UVOT observations
  57. GRB 091029: Swift XRT refined analysis
  58. Fermi Gamma-ray Burst Monitor trigger 091028818 is not a GRB
  59. GRB 091029: BOOTES-3 observations
  60. GRB 091029: Enhanced Swift-XRT position
  61. GRB091024 optical observations
  62. GRB 091029: Gemini-South Redshift
  63. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  64. GRB 091029: Swift detection of a burst with an optical counterpart
  65. A mistake in testing a new function in Swift
  66. GRB 091020: Fermi GBM observation
  67. GRB 091026: Suzaku WAM observation of the prompt emission
  68. GRB 091024: Keck/LRIS Spectroscopy
  69. GRB 091024: YNAO-GMG observations
  70. GRB 091026: GROND Upper Limits
  71. GRB 091020: Late TLS detection
  72. Radio afterglow detection from GRB 091020
  73. GRB 091026: Swift/UVOT Upper Limits
  74. GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
  75. GRB 091026: Swift-XRT refined analysis
  76. GRB 091026: Enhanced Swift-XRT position
  77. Konus-Wind and Konus-RF observations of GRB 091024
  78. GRB 091026: Updated Swift-XRT position
  79. GRB 091026: Swift detection of a Gamma Ray Burst
  80. GRB 091020 : Xinglong TNT upper limit
  81. Swift-BAT Triggers 373776-373778 are not real
  82. GRB091024 Swift/UVOT Upper Limits
  83. GRB 091024: TLS Upper Limit
  84. GRB 091024: KAIT optical afterglow observations
  85. Swift-BAT Triggers 373679-373684 are not real
  86. GRB 091024: Fermi GBM Observations
  87. GRB 091024: Swift-XRT team refined analysis
  88. Swift-BAT trigger 373691 is a galactic bulge transient
  89. GRB 091024: Xinglong TNT optical observation
  90. GRB 091024 : Faulkes Telescope North - Afterglow Confirmation
  91. GRB 091024 Gemini-North redshift
  92. GRB 091024: GRAS004 optical observations
  93. GRB 091024: Swift detection of a burst
  94. Konus-Wind observations of GRB 091010
  95. GRB 091020: Swift-XRT refined analysis
  96. GRB 091018: Swift XRT refined analysis
  97. GRB091020 Swift/UVOT observations
  98. GRB 091020: NOT spectroscopic redshift
  99. GRB 091020: MASTER optical transient polarimetry
  100. GRB 091020: Enhanced Swift-XRT position

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