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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"

19670 results found.

  1. GRB 091024: Fermi GBM Observations
  2. GRB 091024: Swift-XRT team refined analysis
  3. Swift-BAT trigger 373691 is a galactic bulge transient
  4. GRB 091024 : Faulkes Telescope North - Afterglow Confirmation
  5. GRB 091024: Faulkes Telescope North Afterglow Candidate
  6. GRB 091024: Swift detection of a burst
  7. GRB 091020: Swift-XRT refined analysis
  8. GRB 091018: Swift XRT refined analysis
  9. GRB091020 Swift/UVOT observations
  10. GRB 091020, Swift-BAT refined analysis
  11. GRB 091020: Enhanced Swift-XRT position
  12. GRB 090926A: Late-time Gemini South Observations and Possible Jet Break
  13. GRB 091020: Swift detection of a burst with an optical afterglow
  14. GRB 091018: Skynet/PROMPT Observations of Fading
  15. Konus-RF observation of GRB 091018
  16. GRB 091018 : Faulkes Telescope South Observations
  17. GRB091018: Swift/UVOT observations
  18. GRB 091018: Swift-BAT refined analysis
  19. GRB 091018: Enhanced Swift-XRT position
  20. GRB 091018: ROTSE-III Detection of Optical Counterpart
  21. GRB 091018: Swift detection of a burst with optical afterglow
  22. GRB 090726 R band observations
  23. GRB 091010: Swift-XRT refined analysis
  24. Radio observation of GRB090927 with ATCA
  25. GRB 091010: Fermi GBM observation
  26. GRB 090531A: Skynet/PROMPT Observations
  27. GRB 090530A: Skynet/DSO Detections
  28. GRB 091010: Enhanced XRT position
  29. GRB 091010: GROND afterglow candidate
  30. GRB 091010: Swift/UVOT Upper Limits
  31. GRB 091010: Swift-XRT position
  32. GRB 090518: Skynet/PROMPT Observations
  33. Short-Duration GRB 090621: Skynet/Dolomiti Observations
  34. GRB 090812: Skynet/PROMPT and GORT Observations
  35. GRB 091003: Lick observations and possible SDSS host galaxy
  36. GRB 090926B: Skynet/PROMPT Observations
  37. GRB 090929B: Suzaku WAM observation of the prompt emission
  38. GRB 091003: Swift-XRT confirmation of fading afterglow
  39. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  40. GRB 091003: UVOT-enhanced XRT position
  41. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  42. GRB 091003: Swift XRT analysis
  43. GRB 091003A: Fermi LAT detection
  44. GRB 090929A: Swift/UVOT Observations
  45. GRB 090929A, Swift-BAT refined analysis
  46. GRB 090929B, Swift-BAT refined analysis
  47. Trigger 371210: Swift/BAT Triggered on IGR J17511-3057
  48. GRB 090929A: Swift-XRT non-detection
  49. Konus-Wind observation of GRB 090929A
  50. Konus-Wind observation of GRB 090929B
  51. GRB 090927: Fermi GBM observation
  52. GRB 090929B: Swift-XRT refined analysis
  53. GRB 090929B: Skynet/DSO Observations
  54. GRB 090929B: Swift/UVOT Observations
  55. Konus-RF observation of GRB 090929A
  56. GRB 090929B: RAPTOR Discovery of Optical Counterpart
  57. GRB 090929A BAT location of the Fermi GBM burst
  58. Correction: GRB 090929B: Enhanced Swift-XRT position
  59. GRB 090929: Enhanced Swift-XRT position
  60. GRB 090929B: Swift detection of a burst
  61. GRB090926A: Swift-XRT refined analysis
  62. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  63. GRB 090926B: Fermi GBM detection
  64. GRB 090927: Zadko Telescope observations
  65. GRB 090927, Swift-BAT refined analysis of the possibly short burst
  66. Swift/UVOT observations of GRB 090927
  67. GRB 090927: Swift XRT refined analysis
  68. GRB 090927: Enhanced Swift-XRT position
  69. GRB090926B: Swift/UVOT Upper Limits
  70. GRB090926A: Swift/UVOT observations
  71. GRB 090927: Swift/UVOT detection of an optical afterglow
  72. GRB 090927: Swift detection of a short burst
  73. GRB 090926B: MAXI GSC detection
  74. GRB 090926B: Swift XRT refined analysis
  75. GRB 090926B: Swift-BAT refined analysis
  76. GRB 090926A: Swift/UVOT detection of an optical afterglow
  77. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  78. GRB090926A: UVOT-enhanced XRT position
  79. GRB 090926B: Swift detection of a burst
  80. GRB 090926: Fermi LAT detection
  81. GRB090904B : IRSF NIR upper limit
  82. Swift returns to normal operations
  83. GRB 090715B: Skynet/PROMPT Detections
  84. GRB 090916: Swift-XRT upper limit
  85. GRB 090807: Skynet/DSO Observations
  86. Swift-BAT temporarily off-line for a few days
  87. Short-Duration GRB 090916: Skynet/PROMPT Observations
  88. GRB 090912: optical observation
  89. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  90. GRB 090916, Swift-BAT refined analysis
  91. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  92. GRB 090916: Swift detection of a short burst
  93. GRB 090915 Swift-BAT detection of a burst in ground analysis
  94. GRB 090827: Confirmation of the X-ray afterglow
  95. GRB 090912: Swift-XRT refined analysis
  96. GRB 090912, Swift-BAT refined analysis
  97. GRB 090912: Swift/UVOT Upper Limits
  98. GRB 090912: Enhanced Swift-XRT position
  99. GRB 090912: Swift detection of a burst
  100. GRB 090814A: Skynet/DSO & GORT Observations

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