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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"

28232 results found.

  1. GRB 091208B, RIMOTS optical upper limits
  2. GRB 091208B: Swift detection of a burst with an optical afterglow
  3. GRB 091208B: BOOTES-3 optical afterglow
  4. Short X-ray Transient, RIMOTS optical upper limits
  5. GRB 091123: Suzaku WAM observation of the prompt emission
  6. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  7. GRB 091109A: GROND confirmation of redshift z = 3.5
  8. GRB 091127, SMARTS optical/IR afterglow observations
  9. GRB091202: Swift-XRT refined analysis
  10. GRB 091202: Swift/UVOT Upper Limits
  11. GRB 091202: Optical and NIR observations
  12. GRB 091202 - UVOT-enhanced XRT position
  13. GRB 091127: Zadko Telescope Observations
  14. GRB 091126A: Suzaku WAM observation of the prompt emission
  15. GRB 091202: TAROT Calern observatory optical observations
  16. GRB 091117: Chandra Observations
  17. Konus-Wind observation of very long GRB 091123
  18. GRB 091123: Fermi GBM detection of a very long burst
  19. GRB 091126B: Fermi GBM detection
  20. GRB 091127: Suzaku WAM observation of the prompt emission
  21. GRB 091126: Fermi GBM detection
  22. GRB 091130B: Swift-XRT team refined analysis
  23. GRB 091130B: Swift-BAT refined analysis
  24. GRB 091130B: Swift/UVOT Upper Limits
  25. GRB 091127: Skynet/PROMPT Observations of Fading
  26. GRB 091130B: Enhanced Swift-XRT position
  27. Swift trigger 377436 (possible GRB 091130A) is not a burst
  28. GRB 091130B: Swift detection of a burst
  29. GRB 091127: Radio observations
  30. GRB 091128: Fermi GBM detection
  31. GRB 091127: TAROT La Silla observatory optical observations
  32. GRB 091127: LABOCA/APEX submm observations
  33. GRB 091127: Further NOT optical observations
  34. GRB 091127: Fermi GBM detection
  35. GRB 091127: Swift-XRT afterglow detection and analysis
  36. GRB 091127: TAROT La Silla observatory optical decay
  37. GRB 091127: Swift/UVOT observations
  38. GRB 091127: Swift-BAT refined analysis
  39. GRB 091127: NOT observations
  40. GRB 091127 : GROND observations
  41. GRB 091127: REM NIR afterglow detection
  42. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  43. GRB 091127: Swift detection of a burst
  44. GRB 091120: Fermi GBM observation
  45. GRB 091117A: Suzaku WAM observation of the prompt emission
  46. GRB 091117: TNG optical observations
  47. GRB 091117A: Swift/UVOT followup observations
  48. GRB 091117: VLA radio observations
  49. GRB 091117: Swift-XRT observations
  50. GRB 091117 BAT refined analysis
  51. GRB 091117: Evidence for Variability of XRT Source #1
  52. GRB091117: Gemini South Observations
  53. GRB 091117: Swift XRT refined analysis
  54. GRB 091112: Suzaku WAM observation of the prompt emission
  55. GRB 091102A: Suzaku WAM observation of the prompt emission
  56. GRB 091109B: Suzaku WAM observation of the prompt emission
  57. GRB091111: Swift XRT refined analysis
  58. GRB 091112: Swift-BAT refined analysis
  59. GRB 091031: Fermi LAT detection of a faint burst
  60. GRB 091111: BOOTES-3 contemporaneous imaging
  61. GRB 091111: BOOTES-3 observations
  62. GRB 091109A: GROND and VLT observations
  63. GRB 091109B: Swift/UVOT Upper Limits
  64. GRB 091109B: Swift-XRT Team refined analysis
  65. GRB 091109B: Swift-BAT refined analysis
  66. GRB 091109B: Enhanced Swift-XRT position
  67. GRB 091109B: Optical limits from Watcher
  68. GRB 091109B: ROTSE-III Optical Limits
  69. GRB 091109B: Swift detection of a short burst
  70. GRB 091030: Fermi GBM detection
  71. GRB 091109: Swift-XRT refined analysis
  72. GRB 091109: BOOTES-3 observations
  73. GRB 091109: Swift/UVOT observations
  74. GRB 091109: Faulkes Telescope South observations
  75. GRB 091109: Swift-BAT refined analysis
  76. GRB 091109: Enhanced Swift-XRT position
  77. GRB091109: REM detection of the NIR afterglow
  78. GRB 091109: Swift detection of a burst with optical afterglow
  79. GRB 091029: Observations from Stardome Observatory
  80. GRB 091104: Swift-BAT refined analysis
  81. GRB 091104: Swift XRT Refined Analysis
  82. GRB 091104: Swift/UVOT Upper Limits
  83. GRB 091104: Enhanced Swift-XRT position
  84. GRB 091104: Swift detection of a burst
  85. GRB 091102: LABOCA/APEX submm observations
  86. Fermi LAT Upper Limits on GRB 091010
  87. GRB 091102 : Faulkes Telescope South Upper Limits
  88. GRB 091102: Swift-XRT refined analysis
  89. GRB 091102: Swift/UVOT Upper Limits
  90. GRB 091102: GROND Upper Limits
  91. GRB 091102: BOOTES-3 observations
  92. GRB 091102: Swift-BAT refined analysis
  93. GRB 091102: Swift/XRT localization
  94. GRB 091024: optical observations
  95. GRB 091031: Fermi GBM detection
  96. GRB 091024: Fermi LAT upper limits
  97. GRB 091018, SMARTS optical/IR afterglow observations
  98. GRB 090920: Skynet/DSO Detection
  99. GRB091029: Swift/UVOT observations
  100. GRB 091029: Swift XRT refined analysis

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