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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"

21912 results found.

  1. GRB 131103A: Swift/UVOT Detection
  2. GRB 131103A: Enhanced Swift-XRT position
  3. GRB 131103A: Swift detection of a burst
  4. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  5. GRB131031A: RATIR Optical and NIR Observations
  6. GRB 131018B: RATIR Optical/NIR Observations
  7. GRB 131030A: Continued RATIR Optical and NIR Observations
  8. GRB 131030A: the 2nd epoch of SAO RAS observations
  9. GRB 131031A: Swift/UVOT Upper Limits
  10. GRB 131031A: MASTER optical observation
  11. GRB 131030A: Bassano Bresciano Observatory optical observations
  12. GRB 131031A: 1.23m CAHA afterglow candidate
  13. GRB 131031A: Swift-XRT observations
  14. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  15. GRB 131031A found in ground analysis of BAT data
  16. GRB 131030A: RATIR Optical and NIR Observations
  17. GRB 131030A: TAROT La Silla observatory optical observations
  18. GRB 131030A: Enhanced Swift-XRT position
  19. GRB 131030A: Swift/UVOT Detection
  20. Konus-Wind observation of GRB 131030A
  21. GRB 131030A: SAO RAS optical observations
  22. GRB 131030A: D50+BART detection and light curve optical decay
  23. GRB 131029A: Nanshan optical observations
  24. GRB 131030A: MASTER optical observation
  25. GRB 131029A: Swift-XRT follow up
  26. GRB 131030A: Swift detection of a burst with an optical counterpart
  27. GRB 131029A: Fermi-LAT detection of a burst
  28. Konus-Wind observation of GRB 131028A
  29. IPN Triangulation of GRB 131028A (long/bright)
  30. Swift 575905/GRB 131026A: optical observations
  31. Swift-BAT Trigger 575905 is probably not a real source
  32. GRB 131024B: AAO optical upper limit
  33. GRB 131024B: Mondy optical upper limits
  34. GRB 131024B: MASTER prompt optical observation
  35. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  36. Swift Trigger 575905: ROTSE-III Optical Limits
  37. GRB 131026A: TAROT La Silla observatory optical observations
  38. Swift Trigger 575905: a possible GRB
  39. GRB 131024B: RATIR Optical and NIR Observations
  40. GRB 131024B: Swift/UVOT Upper Limits
  41. GRB 131024B: Nanshan optical upper limit
  42. GRB 131024A: Swift/UVOT Upper Limits
  43. GRB 131024B: Enhanced Swift-XRT position
  44. GRB 131024A: GROND upper limits
  45. GRB 131024B: Swift detection of a burst
  46. GRB 131024A: Skynet R-COP optical observations
  47. Konus-Wind observation of GRB 131011B
  48. GRB 131024A: Enhanced Swift-XRT position
  49. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  50. GRB 131024A: Swift detection of a burst
  51. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  52. IPN Triangulation of GRB 131014A
  53. GRB 131018B: Swift/UVOT Upper Limits
  54. GRB 131018A: RATIR Optical and NIR Observations
  55. GRB 131018A: Swift/UVOT Upper Limits
  56. GRB 131018A: KAIT Optical Upper Limit
  57. GRB 131018A: Enhanced Swift-XRT position
  58. GRB 131014A: XRT position information
  59. GRB131018A, optical observations
  60. GRB 131018A: Swift detection of a burst
  61. GRB 131014A: Suzaku WAM observation of the prompt emission
  62. GRB 131014A: GROND observations
  63. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  64. GRB 131011A: Swift/UVOT Upper Limits
  65. GRB 131014A: Swift/UVOT Upper Limits
  66. GRB 131014A: RATIR Optical and NIR Observations
  67. GRB 131014A: Enhanced XRT position
  68. GRB 131014A: NOT afterglow candidate
  69. GRB 131014A: Nanshan optical observations
  70. GRB 131014A: Fermi-LAT detection
  71. GRB 131011A: GROND afterglow observations
  72. Fermi403206457: continued P60 observations and fading behavior
  73. Fermi403206457: Weihai optical upper limit
  74. Trigger 574266 is not a Swift detection of a known source
  75. GRB 130831A: Continued RATIR Optical and NIR Observations
  76. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  77. GRB 131004A: Swift/UVOT Detection
  78. GRB 131004A: RATIR Optical and NIR Upper Limits
  79. GRB 131004A: GROND observations of the afterglow
  80. GRB 131004A: Enhanced Swift-XRT position
  81. GRB 131004A: Liverpool Telescope optical afterglow observations
  82. GRB 131004A: TNG optical afterglow confirmation
  83. GRB 131004A: optical afterglow from the NOT
  84. GRB 131004A: Swift detection of a burst (may be short)
  85. GRB 131002B: GROND upper limits
  86. GRB 131002B: Swift/UVOT Upper Limits
  87. GRB 131002A: Swift/UVOT Detection
  88. GRB 131001A, Swift-BAT refined analysis
  89. GRB 131002B: Enhanced Swift-XRT position
  90. Swift J1242.9-3530, Swift-BAT refined analysis
  91. GRB 131001A: Swift UVOT and XRT Upper Limits
  92. GRB 131002A: Enhanced Swift-XRT position
  93. GRB 131002B: Swift detection of a burst
  94. GRB 131002A: Swift detection of a burst
  95. GRB 131001A detected in ground analysis of Swift-BAT data
  96. GRB 130929A: Swift/UVOT Upper Limits
  97. GRB 130831A: Continued RATIR Optical and NIR Observations
  98. GRB 130929A: Enhanced Swift-XRT position
  99. GRB 130929A: TAROT La Silla observatory optical observations
  100. GRB 130929A: Swift detection of a burst

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