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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"

27921 results found.

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

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