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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"

45532 results found.

  1. GRB131030A : xinglong TNT optical observation
  2. GRB 131031A: Swift-XRT observations
  3. GRB 131030A: P60 observations
  4. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  5. GRB 131031A found in ground analysis of BAT data
  6. GRB 131030A: RATIR Optical and NIR Observations
  7. GRB 131030A: TAROT La Silla observatory optical observations
  8. GRB 131030A: Swift-XRT refined Analysis
  9. GRB 131030A: Enhanced Swift-XRT position
  10. GRB 131024C: ICSP discovery of a burst in X-rays by balloon borne study
  11. GRB 131030A: Swift/UVOT Detection
  12. Konus-Wind observation of GRB 131030A
  13. GRB 131030A: SAO RAS optical observations
  14. GRB 131030A: 1.23m CAHA BVRI-band observations
  15. GRB 131030A: D50+BART detection and light curve optical decay
  16. GRB 131029A: Nanshan optical observations
  17. GRB 131030A: Spectroscopy from 10.4m GTC
  18. GRB 131030A: NOT redshift
  19. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  20. GRB 131030A: MASTER optical observation
  21. GRB 131029A: Swift-XRT follow up
  22. GRB 131030A: Watcher OT detection
  23. GRB 131030A: Swift detection of a burst with an optical counterpart
  24. GRB 131029A: Fermi GBM observation
  25. GRB 131029A Tiled Swift observations
  26. GRB 131029A: Fermi-LAT detection of a burst
  27. Konus-Wind observation of GRB 131028A
  28. IPN Triangulation of GRB 131028A (long/bright)
  29. GRB 131028A: Fermi GBM detection
  30. GRB 131011A: ATCA 34GHz upper limit
  31. Swift 575905/GRB 131026A: optical observations
  32. Swift-BAT Trigger 575905 is probably not a real source
  33. GRB 131024B: AAO optical upper limit
  34. GRB 131024B: Mondy optical upper limits
  35. GRB 131024B: MASTER prompt optical observation
  36. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  37. Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations
  38. Swift Trigger 575905: ROTSE-III Optical Limits
  39. Swift Trigger 575905: KAIT Optical Upper Limit
  40. GRB 131026A: TAROT La Silla observatory optical observations
  41. Swift Trigger 575905: a possible GRB
  42. GRB 131024B, Swift-BAT refined analysis
  43. GRB 131024B: Fermi GBM observation
  44. GRB 131024B: RATIR Optical and NIR Observations
  45. GRB 131024B: Swift/UVOT Upper Limits
  46. GRB 131024B : Xinglong TNT upper limit
  47. GRB 131024B: Swift-XRT refined Analysis
  48. Fermi GBM trigger 13121024.436 is not a GRB
  49. GRB 131024B: Nanshan optical upper limit
  50. GRB 131024A: Swift/UVOT Upper Limits
  51. GRB 131024B: Enhanced Swift-XRT position
  52. GRB 131024A: GROND upper limits
  53. GRB 131024A: Swift-XRT refined Analysis
  54. GRB 131024B: Swift detection of a burst
  55. GRB 131024A, Swift-BAT refined analysis
  56. GRB 131024A: Skynet R-COP optical observations
  57. Konus-Wind observation of GRB 131011B
  58. GRB 131024A: Enhanced Swift-XRT position
  59. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  60. GRB 131024A: Swift detection of a burst
  61. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  62. IPN Triangulation of GRB 131014A
  63. GRB 131018B: Swift/UVOT Upper Limits
  64. GRB 131018B: Swift-XRT observations
  65. GRB 131018B: Fermi GBM observation
  66. GRB 131018A: RATIR Optical and NIR Observations
  67. GRB 131018A: Swift/UVOT Upper Limits
  68. GRB 131018B: Fermi-LAT detection of a burst
  69. GRB 131018A: Swift-XRT refined Analysis
  70. GRB 131018A: KAIT Optical Upper Limit
  71. GRB 131018A, Swift-BAT refined analysis
  72. GRB 131018A: P60 Observations
  73. GRB 131018A: Enhanced Swift-XRT position
  74. GRB 131014A: XRT position information
  75. GRB131018A, optical observations
  76. GRB 131018A: Swift detection of a burst
  77. GRB 131014A: Suzaku WAM observation of the prompt emission
  78. GRB 131014A: GROND observations
  79. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  80. GRB 131014A: Swift-XRT refined Analysis
  81. GRB 131011A: Swift/UVOT Upper Limits
  82. GRB 131014A: Swift/UVOT Upper Limits
  83. Fermi 403206457 / GRB 131011A: AAO optical observations
  84. GRB 131014A: RATIR Optical and NIR Observations
  85. GRB 131014A: Enhanced XRT position
  86. Konus-Wind observation of GRB 131014A
  87. GRB 131014A: NOT afterglow candidate
  88. GRB 131014A: Nanshan optical observations
  89. GRB 131014A: Swift detection of a possible X-ray afterglow
  90. GRB 131014A Tiled Swift observations
  91. GRB 131014A: Fermi-LAT detection
  92. GRB 131014A: Fermi GBM detection
  93. GRB 131011A: Fermi GBM detection
  94. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  95. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  96. GRB 131011A: GROND afterglow observations
  97. Fermi403206457: continued P60 observations and fading behavior
  98. Fermi403206457: Weihai optical upper limit
  99. Fermi403206457: NOT optical observations
  100. Fermi403206457: iPTF detection of a possible optical afterglow

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