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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"

11074 results found.

  1. GRB 100115A: SARA Afterglow Candidate
  2. GRB 100115A: Swift-XRT candidate afterglow
  3. GRB 100111A: PAIRITEL NIR Upper Limits
  4. GRB100111A: Swift-XRT refined analysis
  5. GRB 100111A: Swift detection of a burst with an optical afterglow
  6. GRB 100103A: GROND Upper Limits
  7. Konus-Wind observation of GRB 100103A
  8. GRB 100103A: a long GRB detected with INTEGRAL
  9. Swift Trigger 381591 is probably not a burst
  10. GRB 091221: Fermi GBM Observation
  11. GRB 091221 Swift-BAT refined analysis
  12. GRB 091221: ROTSE-III Detection of Optical Counterpart
  13. GRB 091221: Swift detection of a burst
  14. Konus-Wind observation of GRB 091208A
  15. GRB 091208B: GAO 150cm telescope Optical Observation
  16. GRB 091208B: optical observations
  17. GRB091208B: NOT optical observations
  18. GRB 091208B: Swift-XRT refined analysis
  19. GRB 091208B: Swift detection of a burst with an optical afterglow
  20. GRB 091208: ROTSE-III Optical Limits
  21. Short X-ray Transient, RIMOTS optical upper limits
  22. GRB 091109A: GROND confirmation of redshift z = 3.5
  23. GRB091202: Swift-XRT refined analysis
  24. GRB 091126A: Suzaku WAM observation of the prompt emission
  25. Short X-ray Transient Detection by MAXI/GSC
  26. Konus-Wind observation of very long GRB 091123
  27. Konus-Wind observation of GRB 091127
  28. GRB 091127: MASTER early optical transient polarimetry
  29. GRB 091127: Swift-XRT afterglow detection and analysis
  30. GRB 091127: TAROT La Silla observatory optical decay
  31. Konus-Wind observation of GRB 091120
  32. GRB 091120: MAXI GSC detection
  33. GRB 091120: Fermi GBM observation
  34. Konus-Wind observations of GRB 091117A
  35. Konus-Wind and Konus-RF observations of GRB 091031
  36. GRB 091031: Fermi LAT detection of a faint burst
  37. GRB 091112: Swift detection of a possible burst
  38. GRB 091109B: Swift-XRT Team refined analysis
  39. GRB 091109B: ROTSE-III Optical Limits
  40. GRB 091109B: Swift detection of a short burst
  41. GRB091109: Correction to GCN 10139
  42. GRB 091109: Swift-XRT refined analysis
  43. GRB 091109: Swift/UVOT observations
  44. GRB 091109: Faulkes Telescope South observations
  45. GRB091109: REM detection of the NIR afterglow
  46. GRB 091109: Swift detection of a burst with optical afterglow
  47. GRB 091104: Swift-BAT refined analysis
  48. GRB 091104: Swift XRT Refined Analysis
  49. GRB 091104: Swift detection of a burst
  50. Fermi LAT Upper Limits on GRB 091010
  51. GRB 091102: Swift-BAT refined analysis
  52. GRB 091102: ROTSE-III Optical Limits
  53. GRB 091024: Fermi LAT upper limits
  54. GRB 091029: Swift XRT refined analysis
  55. GRB 091029: Swift-BAT refined analysis
  56. GRB 091029: Swift detection of a burst with an optical counterpart
  57. GRB 091020: Fermi GBM observation
  58. GRB 091026: Swift-XRT refined analysis
  59. Konus-Wind and Konus-RF observations of GRB 091024
  60. GRB 091026: Swift detection of a Gamma Ray Burst
  61. GRB 091020 : Xinglong TNT upper limit
  62. GRB 091024: KAIT optical afterglow observations
  63. GRB 091024: Swift-BAT refined analysis
  64. Konus-Wind observations of GRB 091010
  65. GRB 091020: Swift-XRT refined analysis
  66. GRB 091018: Swift XRT refined analysis
  67. GRB 091020: NOT spectroscopic redshift
  68. GRB 090926A: Late-time Gemini South Observations and Possible Jet Break
  69. Konus-RF observation of GRB 091018
  70. GRB091018: Swift/UVOT observations
  71. GRB 091018: Swift-BAT refined analysis
  72. GRB 091018: ROTSE-III Detection of Optical Counterpart
  73. GRB 091018: Swift detection of a burst with optical afterglow
  74. GRB 091003: Possible Supernova Component
  75. GRB 090815: a faint long GRB localized by INTEGRAL
  76. Radio observation of GRB080916c with ATCA
  77. GRB 090530A: Skynet/DSO Detections
  78. Konus-Wind observations of GRB 091010
  79. GRB 090812: Skynet/PROMPT and GORT Observations
  80. Konus-Wind observation of GRB 091003A
  81. GRB 090929B: Suzaku WAM observation of the prompt emission
  82. GRB 091003: Swift XRT analysis
  83. GRB 091003A: Fermi LAT detection
  84. GRB 090929B, Swift-BAT refined analysis
  85. Konus-Wind observation of GRB 090929A
  86. Konus-Wind observation of GRB 090929B
  87. GRB 090929B: Swift-XRT refined analysis
  88. GRB 090926A: Fermi LAT and GBM refined analysis
  89. Konus-RF observation of GRB 090929A
  90. GRB 090929B: RAPTOR Discovery of Optical Counterpart
  91. Konus-Wind and Konus-RF observations of GRB 090926A
  92. GRB 090927: Swift XRT refined analysis
  93. GRB 090926A: Suzaku WAM observation of the prompt emission
  94. GRB 090926B: MAXI GSC detection
  95. GRB 090926B: Swift XRT refined analysis
  96. GRB 090926B: Swift-BAT refined analysis
  97. GRB 090926B: Swift detection of a burst
  98. GRB 090926: Fermi LAT detection
  99. GRB 090926: Fermi GBM detection
  100. GRB 090925: Fermi GBM detection

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