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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"

16268 results found.

  1. GRB 131128A: Kanata/HOWPol optical observation
  2. GRB 131128A: T100 observations
  3. GRB 131128A: Nanshan afterglow confirmation
  4. GRB 131128A: MASTER-Net optical observations
  5. GRB 131128A: Nanshan afterglow candidate
  6. GRB 131127B: MASTER-Net optical observations
  7. GRB 131127A: Bassano Bresciano Observatory optical upper limit
  8. GRB 131127B: Nanshan optical observations
  9. IPN Triangulation of GRB 131127B
  10. GRB 131127B: Fermi GBM detection
  11. GRB 131127A: Swift/UVOT Upper Limits
  12. GRB 131127A: AROMA-N Optical Observation
  13. GRB 131127A: RATIR Optical and NIR Observations, High-z Candidate
  14. Fermi407254341: iPTF optical afterglow candidates
  15. GRB 131127A. 1.5m OSN optical limit
  16. GRB 131127A: Mondy optical upper limit
  17. GRB 131127A: Nanshan optical upper limit
  18. GRB 131127A: MASTER-NET optical observations
  19. GRB 131122A: Swift/UVOT Upper Limits
  20. GRB 131122A: i-band observations from NOT
  21. GRB 131122A: Nanshan optical upper limit
  22. GRB 131122A (INTEGRAL trigger N6392): MASTER-NET optical observation
  23. GRB 131108A: VLA Observations
  24. GRB 131030A, Optical Observations
  25. GRB 131117A: TAROT La Silla observatory optical observations
  26. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  27. GRB 131110A: Swift-XRT and UVOT upper limits
  28. GRB 131031A: Mondy optical observations
  29. GRB 131108A: optical observations
  30. GRB 131108A: Continued RATIR Optical and NIR Observations
  31. GRB 131030A: MITSuME Akeno Optical observation
  32. GRB 131108A: CARMA 3mm detection
  33. GRB 131108A: RATIR Optical and NIR Observations
  34. GRB 131108A: TAROT-Calern optical observation
  35. GRB 131108A: NOT optical observations
  36. GRB 131108A: 1.23m CAHA optical candidate
  37. GRB 131030A: RATIR Optical and NIR Upper Limits
  38. GRB 131030A: Continued RATIR Optical and NIR Observations
  39. GRB 131105A: Swift/UVOT Upper Limits
  40. GRB 131105A: TAROT La Silla observatory optical observations
  41. GRB 131105A: VLT/X-shooter optical afterglow candidate
  42. GRB 131103A: NOT and VLT observations
  43. GRB 131030A: Continued RATIR Optical and NIR Observations
  44. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  45. GRB131031A: RATIR Optical and NIR Observations
  46. GRB 131018B: RATIR Optical/NIR Observations
  47. GRB 131030A: Continued RATIR Optical and NIR Observations
  48. GRB 131031A: Swift/UVOT Upper Limits
  49. LOAO B,R Observation of GRB131030A
  50. GRB 131030A - RoboPol optical afterglow polarimetry
  51. GRB 131031A: MASTER optical observation
  52. GRB 131030A: Bassano Bresciano Observatory optical observations
  53. GRB 131031A: 1.23m CAHA afterglow candidate
  54. GRB131030A : xinglong TNT optical observation
  55. GRB 131030A: RATIR Optical and NIR Observations
  56. GRB 131030A: TAROT La Silla observatory optical observations
  57. GRB 131030A: T21 optical observations
  58. GRB 131030A: SAO RAS optical observations
  59. GRB 131030A: 1.23m CAHA BVRI-band observations
  60. GRB 131030A: D50+BART detection and light curve optical decay
  61. GRB 131029A: Nanshan optical observations
  62. GRB 131030A: NOT redshift
  63. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  64. GRB 131030A: MASTER optical observation
  65. GRB 131030A: Watcher OT detection
  66. GRB 131030A: Swift detection of a burst with an optical counterpart
  67. GRB 131011A: ATCA 34GHz upper limit
  68. Swift 575905/GRB 131026A: optical observations
  69. Swift-BAT Trigger 575905 is probably not a real source
  70. GRB 131024B: AAO optical upper limit
  71. GRB 131024B: Mondy optical upper limits
  72. GRB 131024B: MASTER prompt optical observation
  73. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  74. Swift Trigger 575905: ROTSE-III Optical Limits
  75. Swift Trigger 575905: KAIT Optical Upper Limit
  76. GRB 131026A: TAROT La Silla observatory optical observations
  77. GRB 131024B: RATIR Optical and NIR Observations
  78. GRB 131024B: Swift/UVOT Upper Limits
  79. GRB 131024B : Xinglong TNT upper limit
  80. GRB 131024B: Nanshan optical upper limit
  81. GRB 131024A: Swift/UVOT Upper Limits
  82. GRB 131024A: Skynet R-COP optical observations
  83. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  84. GRB 131018B: Swift/UVOT Upper Limits
  85. GRB 131018A: RATIR Optical and NIR Observations
  86. GRB 131018A: Swift/UVOT Upper Limits
  87. GRB 131018A: KAIT Optical Upper Limit
  88. GRB131018A, optical observations
  89. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  90. GRB 131011A: Swift/UVOT Upper Limits
  91. Fermi 403206457 / GRB 131011A: AAO optical observations
  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 131011A: Fermi GBM detection
  97. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  98. Fermi403206457: continued P60 observations and fading behavior
  99. Fermi403206457: Weihai optical upper limit
  100. Fermi403206457: NOT optical observations

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