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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"

27919 results found.

  1. GRB 091003A: Fermi LAT detection
  2. GRB 091003A: Fermi GBM detection
  3. GRB 090929A: Swift/UVOT Observations
  4. GRB 090929A, Swift-BAT refined analysis
  5. GRB 090929B, Swift-BAT refined analysis
  6. Trigger 371210: Swift/BAT Triggered on IGR J17511-3057
  7. GRB 090929A: Swift-XRT non-detection
  8. Konus-Wind observation of GRB 090929A
  9. Konus-Wind observation of GRB 090929B
  10. GRB 090927: Fermi GBM observation
  11. GRB 090929B: Swift-XRT refined analysis
  12. GRB 090929B: Skynet/DSO Observations
  13. GRB 090929B: Swift/UVOT Observations
  14. Konus-RF observation of GRB 090929A
  15. GRB 090929B: RAPTOR Discovery of Optical Counterpart
  16. GRB 090929A BAT location of the Fermi GBM burst
  17. Correction: GRB 090929B: Enhanced Swift-XRT position
  18. GRB 090929: Enhanced Swift-XRT position
  19. GRB 090929B: Swift detection of a burst
  20. GRB 090929A: Fermi GBM detection
  21. GRB090926A: Swift-XRT refined analysis
  22. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  23. GRB 090926B: Fermi GBM detection
  24. GRB 090927: Zadko Telescope observations
  25. GRB 090927, Swift-BAT refined analysis of the possibly short burst
  26. Swift/UVOT observations of GRB 090927
  27. GRB 090927: Swift XRT refined analysis
  28. GRB 090927: Enhanced Swift-XRT position
  29. GRB090926B: Swift/UVOT Upper Limits
  30. GRB090926A: Swift/UVOT observations
  31. GRB 090927: Swift/UVOT detection of an optical afterglow
  32. GRB 090927: Swift detection of a short burst
  33. GRB 090926B: MAXI GSC detection
  34. GRB 090926B: Swift XRT refined analysis
  35. GRB 090926B: Swift-BAT refined analysis
  36. GRB 090926A: Swift/UVOT detection of an optical afterglow
  37. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  38. GRB090926A: UVOT-enhanced XRT position
  39. GRB 090926B: Swift detection of a burst
  40. GRB 090926: Fermi LAT detection
  41. GRB 090926: Fermi GBM detection
  42. GRB 090925: Fermi GBM detection
  43. GRB090904B : IRSF NIR upper limit
  44. GRB 090922A: Fermi GBM detection
  45. Swift returns to normal operations
  46. GRB 090715B: Skynet/PROMPT Detections
  47. GRB 090916: Swift-XRT upper limit
  48. GRB 090807: Skynet/DSO Observations
  49. GRB 090915: GROND upper limits
  50. Swift-BAT temporarily off-line for a few days
  51. Short-Duration GRB 090916: Skynet/PROMPT Observations
  52. GRB 090915: SARA detection of afterglow candidate
  53. GRB 090912: optical observation
  54. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  55. GRB 090916, Swift-BAT refined analysis
  56. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  57. GRB 090916: Swift detection of a short burst
  58. GRB 090915 Swift-BAT detection of a burst in ground analysis
  59. GRB 090827: Confirmation of the X-ray afterglow
  60. GRB 090912: Swift-XRT refined analysis
  61. GRB 090912, Swift-BAT refined analysis
  62. GRB 090912: Swift/UVOT Upper Limits
  63. GRB 090912: Enhanced Swift-XRT position
  64. GRB 090912: Swift detection of a burst
  65. GRB 090910: Fermi GBM detection
  66. GRB 090814A: Skynet/DSO & GORT Observations
  67. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  68. GRB 090904B: GROND detection of the optical afterglow
  69. GRB 090904A: Swift/UVOT Refined Analysis
  70. GRB 090904B: Swift/UVOT Refined Analysis
  71. GRB 090904B: Fermi GBM detection
  72. GRB 090904A: Swift-XRT refined analysis
  73. GRB 090904B: Swift XRT Refined Analysis
  74. GRB 090904B: MOA-II Optical observation
  75. GRB 090904A: Enhanced Swift XRT position
  76. GRB 090904B: Swift-BAT refined analysis
  77. GRB 090902B: VLA radio detection
  78. GRB 090904A: Swift-BAT refined analysis
  79. GRB 090904B: Enhanced Swift-XRT position
  80. GRB090904A: Correction to enhanced XRT position
  81. GRB 090904A: Enhanced Swift-XRT position
  82. GRB090904B: REM observations
  83. GRB 090904B: Swift detection of a burst
  84. GRB 090904A: ROTSE-III Optical Limits
  85. GRB 090904: Swift detection of a burst
  86. GRB 090902B: ROTSE-III Detection of Optical Afterglow
  87. GRB 090902B: Swift/UVOT refined analysis
  88. GRB090902B: Swift XRT refined analysis
  89. GRB 090902B: Faulkes Telescope North observations
  90. GRB 090902B: GROND NIR Afterglow Observations
  91. GRB 090902B: Gemini-N absorption redshift
  92. GRB 090902B: Enhanced Swift-XRT position
  93. GRB 090902B: Optical afterglow candidate
  94. GRB090902B: Swift/UVOT observations
  95. GRB 090902B: Swift/XRT Afterglow Candidate
  96. GRB 090902B: Fermi LAT detection
  97. GRB 090902B: Fermi GBM detection of a bright burst
  98. GRB 090902: Fermi GBM detection
  99. GRB 090831C BAT refined analysis
  100. GRB 090831C: GROND upper limits

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