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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"

21938 results found.

  1. GRB 131108A: Continued RATIR Optical and NIR Observations
  2. GRB 131030A: MITSuME Akeno Optical observation
  3. Konus-Wind observation of GRB 131108A
  4. GRB 131108A: AGILE/GRID observation
  5. GRB 131108A: Swift/UVOT Detection
  6. GRB 131108A: RATIR Optical and NIR Observations
  7. GRB 131108A: Swift-XRT observations
  8. GRB 131108A: TAROT-Calern optical observation
  9. GRB 131108A: Fermi-LAT refined analysis
  10. GRB 131108A: NOT optical observations
  11. GRB 131108A: 1.23m CAHA optical candidate
  12. GRB 131030A: RATIR Optical and NIR Upper Limits
  13. GRB 131030A: Continued RATIR Optical and NIR Observations
  14. GRB 131031A: Swift-XRT afterglow confirmation
  15. GRB 131029A: Suzaku WAM observation of the prompt emission
  16. GRB 131105A, Swift-BAT refined analysis
  17. GRB 131030A: Swift-BAT refined analysis
  18. GRB 131105A: Swift/UVOT Upper Limits
  19. GRB 131024B: Suzaku WAM observation of the prompt emission
  20. Konus-Wind observation of GRB 131105A
  21. GRB 131105A: TAROT La Silla observatory optical observations
  22. GRB 131105A: Enhanced Swift-XRT position
  23. GRB 131105A: VLT/X-shooter optical afterglow candidate
  24. GRB 131105A: Swift detection of a burst
  25. GRB 131103A: NOT and VLT observations
  26. GRB 131030A: Continued RATIR Optical and NIR Observations
  27. GRB 131103A: Swift/UVOT Detection
  28. GRB 131103A: Enhanced Swift-XRT position
  29. GRB 131103A: Swift detection of a burst
  30. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  31. GRB131031A: RATIR Optical and NIR Observations
  32. GRB 131018B: RATIR Optical/NIR Observations
  33. GRB 131030A: Continued RATIR Optical and NIR Observations
  34. GRB 131030A: the 2nd epoch of SAO RAS observations
  35. GRB 131031A: Swift/UVOT Upper Limits
  36. GRB 131031A: MASTER optical observation
  37. GRB 131030A: Bassano Bresciano Observatory optical observations
  38. GRB 131031A: 1.23m CAHA afterglow candidate
  39. GRB 131031A: Swift-XRT observations
  40. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  41. GRB 131031A found in ground analysis of BAT data
  42. GRB 131030A: RATIR Optical and NIR Observations
  43. GRB 131030A: TAROT La Silla observatory optical observations
  44. GRB 131030A: Enhanced Swift-XRT position
  45. GRB 131030A: Swift/UVOT Detection
  46. Konus-Wind observation of GRB 131030A
  47. GRB 131030A: SAO RAS optical observations
  48. GRB 131030A: D50+BART detection and light curve optical decay
  49. GRB 131029A: Nanshan optical observations
  50. GRB 131030A: MASTER optical observation
  51. GRB 131029A: Swift-XRT follow up
  52. GRB 131030A: Swift detection of a burst with an optical counterpart
  53. GRB 131029A: Fermi-LAT detection of a burst
  54. Konus-Wind observation of GRB 131028A
  55. IPN Triangulation of GRB 131028A (long/bright)
  56. Swift 575905/GRB 131026A: optical observations
  57. Swift-BAT Trigger 575905 is probably not a real source
  58. GRB 131024B: AAO optical upper limit
  59. GRB 131024B: Mondy optical upper limits
  60. GRB 131024B: MASTER prompt optical observation
  61. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  62. Swift Trigger 575905: ROTSE-III Optical Limits
  63. GRB 131026A: TAROT La Silla observatory optical observations
  64. Swift Trigger 575905: a possible GRB
  65. GRB 131024B: RATIR Optical and NIR Observations
  66. GRB 131024B: Swift/UVOT Upper Limits
  67. GRB 131024B: Nanshan optical upper limit
  68. GRB 131024A: Swift/UVOT Upper Limits
  69. GRB 131024B: Enhanced Swift-XRT position
  70. GRB 131024A: GROND upper limits
  71. GRB 131024B: Swift detection of a burst
  72. GRB 131024A: Skynet R-COP optical observations
  73. Konus-Wind observation of GRB 131011B
  74. GRB 131024A: Enhanced Swift-XRT position
  75. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  76. GRB 131024A: Swift detection of a burst
  77. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  78. IPN Triangulation of GRB 131014A
  79. GRB 131018B: Swift/UVOT Upper Limits
  80. GRB 131018A: RATIR Optical and NIR Observations
  81. GRB 131018A: Swift/UVOT Upper Limits
  82. GRB 131018A: KAIT Optical Upper Limit
  83. GRB 131018A: Enhanced Swift-XRT position
  84. GRB 131014A: XRT position information
  85. GRB131018A, optical observations
  86. GRB 131018A: Swift detection of a burst
  87. GRB 131014A: Suzaku WAM observation of the prompt emission
  88. GRB 131014A: GROND observations
  89. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  90. GRB 131011A: Swift/UVOT Upper Limits
  91. GRB 131014A: Swift/UVOT Upper Limits
  92. GRB 131014A: RATIR Optical and NIR Observations
  93. GRB 131014A: Enhanced XRT position
  94. GRB 131014A: NOT afterglow candidate
  95. GRB 131014A: Nanshan optical observations
  96. GRB 131014A: Fermi-LAT detection
  97. GRB 131011A: GROND afterglow observations
  98. Fermi403206457: continued P60 observations and fading behavior
  99. Fermi403206457: Weihai optical upper limit
  100. Trigger 574266 is not a Swift detection of a known source

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