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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19598 results found.

  1. GRB 091029: Swift XRT refined analysis
  2. GRB 091029: Swift-BAT refined analysis
  3. GRB 091029: Enhanced Swift-XRT position
  4. GRB 091029: Skynet/PROMPT Observations of Peak and Fading
  5. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  6. GRB 091029: Swift detection of a burst with an optical counterpart
  7. A mistake in testing a new function in Swift
  8. GRB 091020: Fermi GBM observation
  9. GRB 091026: Suzaku WAM observation of the prompt emission
  10. GRB 091026: GROND Upper Limits
  11. GRB 091020: Late TLS detection
  12. GRB 091026: Swift-BAT refined analysis
  13. Radio afterglow detection from GRB 091020
  14. GRB 091026: Swift/UVOT Upper Limits
  15. GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
  16. GRB 091026: Swift-XRT refined analysis
  17. GRB 091026: Enhanced Swift-XRT position
  18. Konus-Wind and Konus-RF observations of GRB 091024
  19. GRB 091026: Updated Swift-XRT position
  20. GRB 091026: Swift detection of a Gamma Ray Burst
  21. Swift-BAT Triggers 373776-373778 are not real
  22. GRB091024 Swift/UVOT Upper Limits
  23. GRB 091024: TLS Upper Limit
  24. GRB 091020: Early TLS Multicolor detections, red afterglow
  25. GRB 091024: KAIT optical afterglow observations
  26. GRB 091024: Swift-BAT refined analysis
  27. Swift-BAT Triggers 373679-373684 are not real
  28. GRB 091024: Fermi GBM Observations
  29. GRB 091024: Swift-XRT team refined analysis
  30. Swift-BAT trigger 373691 is a galactic bulge transient
  31. GRB 091024 : Faulkes Telescope North - Afterglow Confirmation
  32. GRB 091024: Faulkes Telescope North Afterglow Candidate
  33. GRB 091024: Swift detection of a burst
  34. GRB 091020: Swift-XRT refined analysis
  35. GRB 091018: Swift XRT refined analysis
  36. GRB091020 Swift/UVOT observations
  37. GRB 091020, Swift-BAT refined analysis
  38. GRB 091020: Enhanced Swift-XRT position
  39. GRB 090926A: Late-time Gemini South Observations and Possible Jet Break
  40. GRB 091020: Swift detection of a burst with an optical afterglow
  41. GRB 091018: Skynet/PROMPT Observations of Fading
  42. Konus-RF observation of GRB 091018
  43. GRB 091018 : Faulkes Telescope South Observations
  44. GRB091018: Swift/UVOT observations
  45. GRB 091018: Swift-BAT refined analysis
  46. GRB 091018: Enhanced Swift-XRT position
  47. GRB 091018: ROTSE-III Detection of Optical Counterpart
  48. GRB 091018: Swift detection of a burst with optical afterglow
  49. GRB 090726 R band observations
  50. GRB 091010: Swift-XRT refined analysis
  51. Radio observation of GRB090927 with ATCA
  52. GRB 091010: Fermi GBM observation
  53. GRB 090531A: Skynet/PROMPT Observations
  54. GRB 090530A: Skynet/DSO Detections
  55. GRB 091010: Enhanced XRT position
  56. GRB 091010: GROND afterglow candidate
  57. GRB 091010: Swift/UVOT Upper Limits
  58. GRB 091010: Swift-XRT position
  59. GRB 090518: Skynet/PROMPT Observations
  60. Short-Duration GRB 090621: Skynet/Dolomiti Observations
  61. GRB 090812: Skynet/PROMPT and GORT Observations
  62. GRB 091003: Lick observations and possible SDSS host galaxy
  63. GRB 090926B: Skynet/PROMPT Observations
  64. GRB 090929B: Suzaku WAM observation of the prompt emission
  65. GRB 091003: Swift-XRT confirmation of fading afterglow
  66. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  67. GRB 091003: UVOT-enhanced XRT position
  68. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  69. GRB 091003: Swift XRT analysis
  70. GRB 091003A: Fermi LAT detection
  71. GRB 090929A: Swift/UVOT Observations
  72. GRB 090929A, Swift-BAT refined analysis
  73. GRB 090929B, Swift-BAT refined analysis
  74. Trigger 371210: Swift/BAT Triggered on IGR J17511-3057
  75. GRB 090929A: Swift-XRT non-detection
  76. Konus-Wind observation of GRB 090929A
  77. Konus-Wind observation of GRB 090929B
  78. GRB 090927: Fermi GBM observation
  79. GRB 090929B: Swift-XRT refined analysis
  80. GRB 090929B: Skynet/DSO Observations
  81. GRB 090929B: Swift/UVOT Observations
  82. Konus-RF observation of GRB 090929A
  83. GRB 090929B: RAPTOR Discovery of Optical Counterpart
  84. GRB 090929A BAT location of the Fermi GBM burst
  85. Correction: GRB 090929B: Enhanced Swift-XRT position
  86. GRB 090929: Enhanced Swift-XRT position
  87. GRB 090929B: Swift detection of a burst
  88. GRB090926A: Swift-XRT refined analysis
  89. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  90. GRB 090926B: Fermi GBM detection
  91. GRB 090927: Zadko Telescope observations
  92. GRB 090927, Swift-BAT refined analysis of the possibly short burst
  93. Swift/UVOT observations of GRB 090927
  94. GRB 090927: Swift XRT refined analysis
  95. GRB 090927: Enhanced Swift-XRT position
  96. GRB090926B: Swift/UVOT Upper Limits
  97. GRB090926A: Swift/UVOT observations
  98. GRB 090927: Swift/UVOT detection of an optical afterglow
  99. GRB 090927: Swift detection of a short burst
  100. GRB 090926B: MAXI GSC detection

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