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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"

20966 results found.

  1. GRB 160925A / Fermi 496473540: Global MASTER Net OT discovery
  2. GRB 160910A: 15 GHz detection from AMI
  3. GRB 160910A: TSHAO optical observations
  4. GRB 160917A: RATIR Optical and NIR Observations
  5. GRB 160917A: Swift/UVOT Detection
  6. GRB 160917A: Mondy optical observations
  7. GRB 160910A: Maidanak optical observations
  8. GRB 160910A: Swift/UVOT Detection
  9. GRB 160912A: RATIR Optical and NIR Observations
  10. GRB 160912A: Swift/UVOT Weak Afterglow Detection
  11. GRB 160912A: Mondy optical observations
  12. GRB 160910A: Mondy optical observations
  13. GRB 160910A: Global MASTER Net OT detection before LAT alert
  14. GRB 160910A: NOT afterglow confirmation
  15. GRB 160910A: Tiled Swift observations
  16. GRB 160910A: Swift-XRT afterglow detection
  17. GRB 160824A: 15 GHz upper limits from AMI
  18. GRB 160821B: 15 GHz upper limits from AMI
  19. GRB 160905A: Swift/UVOT Detection
  20. GRB 160821A: 15 GHz upper limits from AMI
  21. GRB 160816A: Possible radio afterglow detection at 15 GHz with AMI
  22. IceCube HESE 160814: MASTER OT J130845.02-323254.9 as the possible source of the high energy neutrino
  23. GRB 160829A: Swift-XRT observations
  24. GRB 160829A: Swift ToO observations
  25. GRB 160826A: Swift/UVOT Upper Limits
  26. GRB 160825A: not localized by Swift
  27. GRB 160825A: Swift ToO observations
  28. GRB 160824A: ISON/Terskol optical observations
  29. GRB 160824A: Swift/UVOT Possible Afterglow Detection
  30. GRB 160824A: Bassano Bresciano Observatory upper limits
  31. GRB 160821B: VLA 5.0 GHz observations
  32. Possible radio detection of GRB160703A with the GMRT
  33. Possible radio detection of GRB160623A with the GMRT
  34. GRB 160821B: GTC follow-up observation
  35. GRB 160821B: WHT afterglow confirmation and redshift of candidate host
  36. GRB 160821B: Swift/UVOT Upper Limits
  37. Short GRB 160821B: MASTER early optical observations
  38. GRB 160821B: NOT optical afterglow candidate
  39. GRB 160821A: TAROT Calern observatory optical detection
  40. GRB 160821A: Fermi-LAT detection of a bright burst
  41. GRB 160816A: TSHAO optical observations
  42. GRB 160816A: ISON/UAFO optical observations
  43. GRB 160816A: Further RATIR Optical and NIR Observations
  44. Fermi GBM Observations of IceCube-160806A
  45. GRB 160816A: Swift/UVOT Detection
  46. GRB 160804A: 15 GHz detections and upper limit from AMI
  47. GRB 160801A: 15 GHz upper limits from AMI
  48. GRB 160714A: 15 GHz upper limits from AMI
  49. GRB 160816A: RATIR Optical and NIR Observations
  50. GRB 160816A: Swift-XRT afterglow detection
  51. GRB 160816A: Swift ToO observations
  52. GRB 160815A: Swift/UVOT Detection
  53. IceCube 160806A: Lomonosov BDRG gamma ray prompt observations
  54. Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
  55. GRB 160804A: RATIR Optical and NIR Observations
  56. GRB 160804A: TSHAO optical observations
  57. GRB 160804A: ISON/UAFO optical observations
  58. GRB 160804A: GROND observations
  59. GRB 160804A: VLT/X-shooter redshift
  60. GRB 160804A: SAO RAS optical observations
  61. GRB 160804A: TNG optical observations, afterglow fading and candidate host galaxy
  62. GRB 160804A: Swift/UVOT Detection
  63. IceCube-160731A: iPTF P48 Observations
  64. GBM Observations of IceCube 160731
  65. GRB 160801A: TSHAO optical observations
  66. GRB 160801A: Swift/UVOT Upper Limits
  67. GRB 160801A: SAO RAS optical observations
  68. Global MASTER net follow up of IceCube-160731A
  69. Swift follow up of IceCube-160731A
  70. GRB 160716A: TAROT La Silla observatory optical observations
  71. GRB 160705B: 15 GHz upper limits from AMI
  72. GRB 160703A: 15 GHz upper limits from AMI
  73. GRB 160716A: Swift/UVOT Detection
  74. GRB 160714A: Swift/UVOT Upper Limits
  75. Swift Trigger 704327: KAIT Optical Observations
  76. GRB 160714A: TAROT Calern observatory optical observations
  77. GRB 160714A: Swift-XRT observations
  78. GRB 160623A: optical astrometry, photometry, and redshift
  79. Swift-BAT trigger 704327 was due to noise
  80. Swift Trigger 704327: MASTER syncronous optical observations
  81. GRB 160714A: MASTER early optical observations
  82. GRB 160712A: Further GROND observations
  83. GRB 160714A: Optical observations from OSN
  84. GRB 160714A: Swift-XRT observations
  85. GRB 160712A: Swift/UVOT Upper Limits
  86. GRB 160712A: RATIR Optical and NIR Observations
  87. GRB 160712A: GROND observations
  88. GRB 160712A: Skynet R-COP observations
  89. GRB 160629A: 15 GHz detections and upper limits from AMI
  90. GRB 160624A: 15 GHz upper limits from AMI
  91. GRB 160712A: Initial Swift/UVOT observations
  92. GRB 160712A: Swift-XRT observations
  93. GRB 160625B: TSHAO optical observations
  94. GRB 160709A: Swift-XRT observations
  95. GRB 160709A: Global MASTER Net Fermi GBM Alerts observations
  96. GRB 160709A: Fermi GBM Observations
  97. GRB 160709A: Tiled Swift observations
  98. GRB 160705B: TAROT Calern observatory optical observations
  99. GRB 160629A: Mondy optical observations
  100. GRB 160629A: AbAO optical observations

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