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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"

28100 results found.

  1. GRB091018: Swift/UVOT observations
  2. GRB 091018: Swift-BAT refined analysis
  3. GRB 091018: Enhanced Swift-XRT position
  4. GRB 091018: ROTSE-III Detection of Optical Counterpart
  5. GRB 091015: Skynet/PROMPT Observations
  6. GRB 091018: Swift detection of a burst with optical afterglow
  7. GRB 091010: optical obsevation
  8. GRB 090726 R band observations
  9. GRB 091010: optical afterglow candidate rejection
  10. GRB 091010: Swift-XRT refined analysis
  11. GRB 091010: Suzaku WAM observation of the prompt emission
  12. GRB 091010: AGILE-MCAL measurement and GRID upper limit
  13. Radio observation of GRB090927 with ATCA
  14. Radio observation of GRB090926a with ATCA
  15. Radio observation of GRB080916c with ATCA
  16. GRB 091010: Fermi GBM observation
  17. GRB 091010: Faulkes Telescope North observations
  18. GRB 090531A: Skynet/PROMPT Observations
  19. GRB 090530A: Skynet/DSO Detections
  20. GRB 091010: Enhanced XRT position
  21. GRB 091010 optical upper limits
  22. Detection of a short GRB 090929A by RT-2 Experiment
  23. GRB 091010: GROND afterglow candidate
  24. GRB 091010: Swift/UVOT Upper Limits
  25. GRB 091010: Swift-XRT position
  26. GRB 090910: SuperAGILE Localization of a Long GRB
  27. GRB 090926A: Skynet/PROMPT Observations of Day 6 - 11 Fading
  28. GRB 090518: Skynet/PROMPT Observations
  29. Short-Duration GRB 090621: Skynet/Dolomiti Observations
  30. GRB 090904A: afterglow confirmation
  31. GRB 090812: Skynet/PROMPT and GORT Observations
  32. GRB 091003A: Suzaku WAM observation of the prompt emission
  33. GRB 090926B: Skynet/PROMPT Observations
  34. GRB 091003: WHT ACAM observations
  35. GRB 090929B: Suzaku WAM observation of the prompt emission
  36. GRB 090929A: Suzaku WAM observation of the prompt emission
  37. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  38. GRB 091003: Skynet/DSO Observations
  39. GRB 091003: UVOT-enhanced XRT position
  40. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  41. GRB 091003A: Fermi LAT detection
  42. GRB 090926A: Skynet/PROMPT Observations of Day 4 - 6 Fading Rate
  43. GRB 091003A: Fermi GBM detection
  44. GRB 090926A: Skynet/PROMPT Observations of Post-Peak Fading
  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 090929B
  50. GRB 090929B: Swift-XRT refined analysis
  51. GRB 090929B: Gemini-N upper limits
  52. GRB 090929B: Skynet/DSO Observations
  53. GRB 090929B: Swift/UVOT Observations
  54. GRB 090929B: RAPTOR Discovery of Optical Counterpart
  55. GRB 090929A BAT location of the Fermi GBM burst
  56. Correction: GRB 090929B: Enhanced Swift-XRT position
  57. GRB 090929: Enhanced Swift-XRT position
  58. GRB 090929B: Swift detection of a burst
  59. GRB 090929A: Fermi GBM detection
  60. GRB090926A: Swift-XRT refined analysis
  61. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  62. GRB 090927: Zadko Telescope observations
  63. GRB 090927, Swift-BAT refined analysis of the possibly short burst
  64. Swift/UVOT observations of GRB 090927
  65. GRB 090926A: Skynet/PROMPT Continued Observations
  66. GRB 090927: Swift XRT refined analysis
  67. GRB 090926A: Suzaku WAM observation of the prompt emission
  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: optical object in error circle
  74. GRB 090926B: MAXI GSC detection
  75. GRB 090926B: NOT optical observation
  76. GRB 090926B: Swift XRT refined analysis
  77. GRB 090926B: Swift-BAT refined analysis
  78. GRB 090926A: Swift/UVOT detection of an optical afterglow
  79. GRB090926A: UVOT-enhanced XRT position
  80. GRB 090926B: Swift detection of a burst
  81. GRB 090926: Fermi LAT detection
  82. GRB 090926: Fermi GBM detection
  83. GRB 090925: Fermi GBM detection
  84. GRB090922A: correction to Fermi location
  85. GRB 090922A: Fermi GBM detection
  86. GRB 090715B: Skynet/PROMPT Detections
  87. GRB 090726: Skynet/GORT Observations
  88. GRB 090916: Swift-XRT upper limit
  89. GRB 090807: Skynet/DSO Observations
  90. GRB 090915: GROND upper limits
  91. Short-Duration GRB 090916: Skynet/PROMPT Observations
  92. GRB 090915: SARA detection of afterglow candidate
  93. GRB 090912: optical observation
  94. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  95. GRB 090702: Skynet/GORT Observations
  96. GRB 090902B: Skynet/PROMPT Observations
  97. GRB 090916, Swift-BAT refined analysis
  98. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  99. GRB 090915 Swift-BAT detection of a burst in ground analysis
  100. GRB 090827: Confirmation of the X-ray afterglow

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