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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"

27408 results found.

  1. GRB 091018: Skynet/PROMPT Continued Observations of Fading
  2. GRB 091020: Swift-XRT refined analysis
  3. GRB 091018: Swift XRT refined analysis
  4. GRB091020 Swift/UVOT observations
  5. GRB 091020, Swift-BAT refined analysis
  6. GRB 090926A: Late-time Gemini South Observations and Possible Jet Break
  7. GRB 091020: Swift detection of a burst with an optical afterglow
  8. GRB 091018: Skynet/PROMPT Observations of Fading
  9. Konus-RF observation of GRB 091018
  10. GRB 091018 : Faulkes Telescope South Observations
  11. GRB091018: Swift/UVOT observations
  12. GRB 091018: Swift-BAT refined analysis
  13. GRB091018: Magellan Echellette Observations
  14. GRB 091018: ROTSE-III Detection of Optical Counterpart
  15. GRB 091015: Skynet/PROMPT Observations
  16. GRB 091018: Swift detection of a burst with optical afterglow
  17. GRB 090815: a faint long GRB localized by INTEGRAL
  18. GRB 091010: Suzaku WAM observation of the prompt emission
  19. GRB 091010: Fermi GBM observation
  20. GRB 090531A: Skynet/PROMPT Observations
  21. GRB 090530A: Skynet/DSO Detections
  22. GRB 091010: RXTE detection
  23. GRB 091010 optical upper limits
  24. Detection of a short GRB 090929A by RT-2 Experiment
  25. RT-2 observation of the bright GRB 090926A
  26. GRB 091010: Swift-XRT position
  27. SuperAGILE GRB is 091010 and not 090910
  28. GRB 090926A: Skynet/PROMPT Observations of Day 6 - 11 Fading
  29. GRB 090518: Skynet/PROMPT Observations
  30. Short-Duration GRB 090621: Skynet/Dolomiti Observations
  31. GRB 090904A: afterglow confirmation
  32. GRB 090812: Skynet/PROMPT and GORT Observations
  33. GRB 091003A: Suzaku WAM observation of the prompt emission
  34. GRB 090926B: Skynet/PROMPT Observations
  35. Konus-Wind observation of GRB 091003A
  36. GRB 090929B: Suzaku WAM observation of the prompt emission
  37. GRB 090929A: 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: Skynet/DSO Observations
  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 090926A: Skynet/PROMPT Observations of Day 4 - 6 Fading Rate
  45. GRB 091003A: Fermi GBM detection
  46. GRB 090926A: Skynet/PROMPT Observations of Post-Peak Fading
  47. GRB 090929A: Swift/UVOT Observations
  48. GRB 090929A, Swift-BAT refined analysis
  49. GRB 090929B, Swift-BAT refined analysis
  50. Trigger 371210: Swift/BAT Triggered on IGR J17511-3057
  51. GRB 090929A: Swift-XRT non-detection
  52. Konus-Wind observation of GRB 090929A
  53. Konus-Wind observation of GRB 090929B
  54. GRB 090927: Fermi GBM observation
  55. GRB 090929B: Swift-XRT refined analysis
  56. GRB 090926A: Fermi LAT and GBM refined analysis
  57. GRB 090929B: Skynet/DSO Observations
  58. GRB 090929B: Swift/UVOT Observations
  59. Konus-RF observation of GRB 090929A
  60. GRB 090929B: RAPTOR Discovery of Optical Counterpart
  61. GRB 090929A BAT location of the Fermi GBM burst
  62. GRB 090929B: Swift detection of a burst
  63. GRB 090929A: Fermi GBM detection
  64. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  65. Konus-Wind and Konus-RF observations of GRB 090926A
  66. GRB 090926B: Fermi GBM detection
  67. GRB 090927: Zadko Telescope observations
  68. GRB 090927, Swift-BAT refined analysis of the possibly short burst
  69. Swift/UVOT observations of GRB 090927
  70. GRB 090926A: Skynet/PROMPT Continued Observations
  71. GRB 090927: Swift XRT refined analysis
  72. GRB 090926A: Suzaku WAM observation of the prompt emission
  73. GRB090926B: Swift/UVOT Upper Limits
  74. GRB090926A: Swift/UVOT observations
  75. GRB 090927: Swift/UVOT detection of an optical afterglow
  76. GRB 090927: Swift detection of a short burst
  77. GRB 090926B: MAXI GSC detection
  78. GRB 090926B: Swift XRT refined analysis
  79. GRB 090926B: Swift-BAT refined analysis
  80. GRB 090926A: Swift/UVOT detection of an optical afterglow
  81. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  82. GRB 090926B: Swift detection of a burst
  83. GRB 090926: Fermi LAT detection
  84. GRB 090926: Fermi GBM detection
  85. GRB 090925: Fermi GBM detection
  86. GRB 090922A: Fermi GBM detection
  87. Swift returns to normal operations
  88. GRB 090715B: Skynet/PROMPT Detections
  89. GRB 090726: Skynet/GORT Observations
  90. GRB 090916: Swift-XRT upper limit
  91. GRB 090807: Skynet/DSO Observations
  92. Swift-BAT temporarily off-line for a few days
  93. Short-Duration GRB 090916: Skynet/PROMPT Observations
  94. GRB 090915: SARA detection of afterglow candidate
  95. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  96. GRB 090702: Skynet/GORT Observations
  97. GRB 090902B: Skynet/PROMPT Observations
  98. GRB 090916, Swift-BAT refined analysis
  99. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  100. GRB 090916: Swift detection of a short burst

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