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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"

28117 results found.

  1. GRB 091117: Chandra Observations
  2. Konus-Wind observation of very long GRB 091123
  3. GRB 091123: Fermi GBM detection of a very long burst
  4. GRB 091126B: Fermi GBM detection
  5. GRB 091127: Suzaku WAM observation of the prompt emission
  6. GRB 091126: Fermi GBM detection
  7. GRB 091130B: Swift-XRT team refined analysis
  8. GRB 091130B: Swift-BAT refined analysis
  9. GRB 091130B: Swift/UVOT Upper Limits
  10. GRB 091127: Skynet/PROMPT Observations of Fading
  11. GRB 091130B: Enhanced Swift-XRT position
  12. Swift trigger 377436 (possible GRB 091130A) is not a burst
  13. GRB 091130B: Swift detection of a burst
  14. GRB 091127: Radio observations
  15. GRB 091128: Fermi GBM detection
  16. GRB 091127: TAROT La Silla observatory optical observations
  17. GRB 091127: LABOCA/APEX submm observations
  18. GRB 091127: Further NOT optical observations
  19. GRB 091127: Fermi GBM detection
  20. GRB 091127: Swift-XRT afterglow detection and analysis
  21. GRB 091127: TAROT La Silla observatory optical decay
  22. GRB 091127: Swift/UVOT observations
  23. GRB 091127: Swift-BAT refined analysis
  24. GRB 091127: NOT observations
  25. GRB 091127 : GROND observations
  26. GRB 091127: REM NIR afterglow detection
  27. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  28. GRB 091127: Swift detection of a burst
  29. GRB 091120: Fermi GBM observation
  30. GRB 091117A: Suzaku WAM observation of the prompt emission
  31. GRB 091117: TNG optical observations
  32. GRB 091117A: Swift/UVOT followup observations
  33. GRB 091117: VLA radio observations
  34. GRB 091117: Swift-XRT observations
  35. GRB 091117 BAT refined analysis
  36. GRB 091117: Evidence for Variability of XRT Source #1
  37. GRB091117: Gemini South Observations
  38. GRB 091117: Swift XRT refined analysis
  39. GRB 091112: Suzaku WAM observation of the prompt emission
  40. GRB 091102A: Suzaku WAM observation of the prompt emission
  41. GRB 091109B: Suzaku WAM observation of the prompt emission
  42. GRB091111: Swift XRT refined analysis
  43. GRB 091112: Swift-BAT refined analysis
  44. GRB 091031: Fermi LAT detection of a faint burst
  45. GRB 091111: BOOTES-3 contemporaneous imaging
  46. GRB 091111: BOOTES-3 observations
  47. GRB 091109A: GROND and VLT observations
  48. GRB 091109B: Swift/UVOT Upper Limits
  49. GRB 091109B: Swift-XRT Team refined analysis
  50. GRB 091109B: Swift-BAT refined analysis
  51. GRB 091109B: Enhanced Swift-XRT position
  52. GRB 091109B: Optical limits from Watcher
  53. GRB 091109B: ROTSE-III Optical Limits
  54. GRB 091109B: Swift detection of a short burst
  55. GRB 091030: Fermi GBM detection
  56. GRB 091109: Swift-XRT refined analysis
  57. GRB 091109: BOOTES-3 observations
  58. GRB 091109: Swift/UVOT observations
  59. GRB 091109: Faulkes Telescope South observations
  60. GRB 091109: Swift-BAT refined analysis
  61. GRB 091109: Enhanced Swift-XRT position
  62. GRB091109: REM detection of the NIR afterglow
  63. GRB 091109: Swift detection of a burst with optical afterglow
  64. GRB 091029: Observations from Stardome Observatory
  65. GRB 091104: Swift-BAT refined analysis
  66. GRB 091104: Swift XRT Refined Analysis
  67. GRB 091104: Swift/UVOT Upper Limits
  68. GRB 091104: Enhanced Swift-XRT position
  69. GRB 091104: Swift detection of a burst
  70. GRB 091102: LABOCA/APEX submm observations
  71. Fermi LAT Upper Limits on GRB 091010
  72. GRB 091102 : Faulkes Telescope South Upper Limits
  73. GRB 091102: Swift-XRT refined analysis
  74. GRB 091102: Swift/UVOT Upper Limits
  75. GRB 091102: GROND Upper Limits
  76. GRB 091102: BOOTES-3 observations
  77. GRB 091102: Swift-BAT refined analysis
  78. GRB 091102: Swift/XRT localization
  79. GRB 091024: optical observations
  80. GRB 091031: Fermi GBM detection
  81. GRB 091024: Fermi LAT upper limits
  82. GRB 091018, SMARTS optical/IR afterglow observations
  83. GRB 090920: Skynet/DSO Detection
  84. GRB091029: Swift/UVOT observations
  85. GRB 091029: Swift XRT refined analysis
  86. GRB 091029: Swift-BAT refined analysis
  87. GRB 091029: Enhanced Swift-XRT position
  88. GRB091024 optical observations
  89. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  90. GRB 091029: Swift detection of a burst with an optical counterpart
  91. GRB 091020: Fermi GBM observation
  92. GRB 091026: Suzaku WAM observation of the prompt emission
  93. GRB 091026: GROND Upper Limits
  94. GRB 091026: Swift-BAT refined analysis
  95. Radio afterglow detection from GRB 091020
  96. GRB 091026: Swift/UVOT Upper Limits
  97. GRB 091026: Swift-XRT refined analysis
  98. GRB 091026: Enhanced Swift-XRT position
  99. Konus-Wind and Konus-RF observations of GRB 091024
  100. GRB 091026: Swift detection of a Gamma Ray Burst

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