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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"

37349 results found.

  1. GRB 130831A : Xinglong 60cm optical observation
  2. Konus-Wind observation of GRB 130831A
  3. GRB 130831A: Gemini-North Redshift
  4. GRB 130831A: MITSuME Akeno Optical observation
  5. GRB 130831A: Weihai optical observations
  6. GRB 130831B: Swift detection of a burst
  7. GRB 130831A: Faulkes Telescope North and South optical afterglow
  8. GRB 130831A: Swift detection of a burst with an optical counterpart
  9. IPN triangulation of GRB 130828A - error box
  10. GRB 130822A: optical upper limits
  11. GRB 130829A: AAO optical observations
  12. GRB 130828A: Swift XRT and UVOT observations
  13. GRB 130829A: NOT optical observations
  14. Correction to GCN 15132 - GRB 130828A
  15. IPN triangulation of GRB 130828A
  16. GRB 130829A: Swift detection of a burst
  17. GRB 130828A Tiled Swift observations
  18. GRB 130828A: Fermi GBM detection
  19. GRB 130828A: Fermi-LAT detection of a burst
  20. IPN triangulation of GRB130821A
  21. GRB 130822A Swift-BAT Spectral lag analysis
  22. Konus-Wind observation of GRB 130821A
  23. GRB 130821A: Weihai optical upper limit
  24. GRB 130821A: Swift-XRT observation
  25. GRB 130822A: 5.8 GHz VLA upper limit
  26. GRB 130822A: Gemini Observations
  27. GRB 130822A: Swift-XRT refined Analysis
  28. GRB 130822A: WHT ACAM observations
  29. GRB 130822A: Swift/UVOT Upper Limits
  30. GRB 130822A: Enhanced Swift-XRT position
  31. GRB 130822A, Swift-BAT refined analysis
  32. GRB 130821A: Fermi-LAT detection of a burst
  33. GRB 130822A: Weihai optical upper limit
  34. GRB 130821A: Fermi GBM Detection
  35. GRB 130822A: Swift detection of a short burst
  36. GRB 130816A: Swift/UVOT Upper Limits
  37. GRB 130816B: Swift/UVOT Upper Limits
  38. Fermi Gamma-ray Burst Monitor trigger 398555975 / 130818916 is not a GRB
  39. GRB 130816B, Swift-BAT refined analysis
  40. GRB 130816B: GROND afterglow candidate
  41. GRB 130816A: Swift-XRT refined Analysis
  42. GRB 130816A, Swift-BAT refined analysis
  43. GRB 130816A: Fermi GBM observation
  44. GRB 130816B: Swift-XRT refined Analysis
  45. GRB 130816B: Enhanced Swift-XRT position
  46. GRB 130816A: GROND confirmation of afterglow
  47. GRB 130816A: Enhanced Swift-XRT position
  48. GRB 130816B: Swift detection of a burst
  49. GRB 130816A: REM NIR candidate afterglow
  50. GRB 130816A: Swift detection of a burst
  51. Refined IPN Triangulation of GRB 130812B
  52. Konus-Wind observation of GRB 130812B
  53. IPN Triangulation of GRB 130812B (long/soft)
  54. GRB 130812A: Swift/UVOT Upper Limits
  55. GRB 130812A, Swift-BAT refined analysis
  56. GRB 130812A: GROND upper limits
  57. GRB 130812A: Swift-XRT refined Analysis
  58. GRB 130812A: Enhanced Swift-XRT position
  59. GRB 130812A: Swift detection of a burst
  60. GRB130807A: Swift/UVOT observations
  61. GRB 130807A: Swift-XRT refined analysis
  62. GRB 130806A: Swift/UVOT Upper Limits
  63. GRB 130807A, Swift-BAT refined analysis
  64. GRB 130807A: Swift detection of a GRB or Galactic transient
  65. Konus-Wind observation of GRB 130804A
  66. GRB 130623A: GROND detection of the optical/NIR afterglow
  67. GRB 130806A: MITSuME Akeno Optical observation
  68. GRB 130806A: Swift-XRT refined Analysis
  69. GRB 130806A: MITSuME Okayama upper limits
  70. GRB 130806A, Swift-BAT refined analysis
  71. IPN localization of GRB 130804A
  72. GRB130803A: GROND observations
  73. GRB 130806A: Enhanced Swift-XRT position
  74. GRB 130806A: Swift detection of a burst
  75. GRB 130804A; Fermi GBM observation
  76. GRB 130803A: Swift-XRT refined Analysis
  77. GRB 130803A: RATIR Optical and NIR Observations
  78. GRB130803A: GROND detection of possible host
  79. GRB 130803A: Swift/UVOT Upper Limits
  80. GRB 130803A; Fermi GBM observation
  81. GRB 130803A, Swift-BAT refined analysis
  82. GRB 130803A: Enhanced Swift-XRT position
  83. GRB 130803A: Faulkes Telescope South Observations
  84. GRB 130603B: Second epoch of HST WFC/F160W imaging
  85. GRB 130803A: Swift detection of a burst
  86. GRB 130727A: Watcher optical limit
  87. GRB 130722A: RATIR Optical Observations
  88. GRB 130727A: Swift/UVOT Detection
  89. Konus-Wind observation of GRB 130727A
  90. GRB 130727A: Swift-XRT refined Analysis
  91. GRB 130727A: Fermi GBM detection
  92. GRB 130727A: GROND observations
  93. GRB 130727A: Enhanced Swift-XRT position
  94. GRB 130727A: Faulkes Telescope South optical afterglow
  95. GRB 130727A: Swift-BAT refined analysis
  96. GRB 130727A: Swift-XRT observations
  97. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  98. GRB 130727A: Swift detection of a burst
  99. GRB 130725B: Swift/UVOT Observations
  100. GRB 130725B: Swift trigger time correction

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