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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20955 results found.

  1. GRB 131122A: Swift/UVOT Upper Limits
  2. GRB 131122A: Swift-XRT observations
  3. GRB 131122A: i-band observations from NOT
  4. GRB 131122A (INTEGRAL trigger N6392): MASTER-NET optical observation
  5. GRB 131108A: VLA Observations
  6. GRB 131030A, Optical Observations
  7. GRB 131117A: TAROT La Silla observatory optical observations
  8. GRB 131117A: Swift/UVOT Detection
  9. GRB 131117A: VLT/X-shooter redshift
  10. GRB 131117A: GROND confirmation of the afterglow and photo-z.
  11. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  12. GRB 130925A: HST imaging
  13. GRB 131110A: Swift-XRT and UVOT upper limits
  14. GRB 131031A: Mondy optical observations
  15. GRB 131108A: optical observations
  16. GRB 131108A: Continued RATIR Optical and NIR Observations
  17. GRB 131108A: AGILE/GRID observation
  18. GRB 131108A: CARMA 3mm detection
  19. GRB 131108A: Swift/UVOT Detection
  20. GRB 131108A: RATIR Optical and NIR Observations
  21. GRB 131108A: Swift-XRT observations
  22. GRB 131108A: TAROT-Calern optical observation
  23. GRB 131108A: Fermi-LAT refined analysis
  24. GRB 131108A: NOT optical observations
  25. GRB 131108A: Redshift from 10.4m GTC
  26. GRB 131108A: 1.23m CAHA optical candidate
  27. GRB 131108A: Swift detection of a possible X-ray afterglow
  28. GRB 131108A Tiled Swift observations
  29. GRB 131030A: RATIR Optical and NIR Upper Limits
  30. GRB 131030A: Continued RATIR Optical and NIR Observations
  31. GRB 131105A: Swift/UVOT Upper Limits
  32. GRB 131103A: VLT/X-shooter redshift
  33. GRB 131105A: VLT/X-shooter redshift
  34. GRB 131105A: TAROT La Silla observatory optical observations
  35. GRB 131103A: NOT and VLT observations
  36. GRB 131030A: Continued RATIR Optical and NIR Observations
  37. GRB 131103A: Swift/UVOT Detection
  38. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  39. GRB131031A: RATIR Optical and NIR Observations
  40. GRB 131018B: RATIR Optical/NIR Observations
  41. GRB 131030A: Continued RATIR Optical and NIR Observations
  42. GRB 131030A: the 2nd epoch of SAO RAS observations
  43. GRB 131031A: Swift/UVOT Upper Limits
  44. LOAO B,R Observation of GRB131030A
  45. GRB 131018B: Further Swift-XRT observations.
  46. GRB 131030A: Bassano Bresciano Observatory optical observations
  47. GRB 131031A: 1.23m CAHA afterglow candidate
  48. GRB 131031A: Swift-XRT observations
  49. GRB 131030A: P60 observations
  50. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  51. GRB 131030A: RATIR Optical and NIR Observations
  52. GRB 131030A: TAROT La Silla observatory optical observations
  53. GRB 131030A: T21 optical observations
  54. GRB 131030A: Swift/UVOT Detection
  55. GRB 131030A: SAO RAS optical observations
  56. GRB 131030A: 1.23m CAHA BVRI-band observations
  57. GRB 131029A: Nanshan optical observations
  58. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  59. GRB 131030A: Watcher OT detection
  60. GRB 131029A Tiled Swift observations
  61. GRB 131011A: ATCA 34GHz upper limit
  62. Swift 575905/GRB 131026A: optical observations
  63. GRB 131024B: MASTER prompt optical observation
  64. Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations
  65. Swift Trigger 575905: KAIT Optical Upper Limit
  66. GRB 131026A: TAROT La Silla observatory optical observations
  67. GRB 131024B: RATIR Optical and NIR Observations
  68. GRB 131024B: Swift/UVOT Upper Limits
  69. GRB 131024A: Swift/UVOT Upper Limits
  70. GRB 131024A: GROND upper limits
  71. GRB 131024A: Skynet R-COP optical observations
  72. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  73. GRB 131018B: Swift/UVOT Upper Limits
  74. GRB 131018B: Swift-XRT observations
  75. GRB 131018A: RATIR Optical and NIR Observations
  76. GRB 131018A: Swift/UVOT Upper Limits
  77. GRB 131018A: KAIT Optical Upper Limit
  78. GRB 131018A: P60 Observations
  79. GRB131018A, optical observations
  80. GRB 131014A: GROND observations
  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: Nanshan optical observations
  86. GRB 131014A: Swift detection of a possible X-ray afterglow
  87. GRB 131014A Tiled Swift observations
  88. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  89. GRB 131011A: GROND afterglow observations
  90. Fermi403206457: continued P60 observations and fading behavior
  91. Fermi403206457: NOT optical observations
  92. Fermi403206457: iPTF detection of a possible optical afterglow
  93. Trigger 574266 is not a Swift detection of a known source
  94. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  95. GRB 130831A: Continued RATIR Optical and NIR Observations
  96. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  97. GRB 131004A: CARMA 93 GHz upper limit
  98. GRB 131004A: Swift/UVOT Detection
  99. GRB 131004A: RATIR Optical and NIR Upper Limits
  100. GRB 131004A: GROND observations of the afterglow

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