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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"

19595 results found.

  1. GRB 140419A: Swift UVOT refined analysis
  2. GRB 140419A: P60 Observations
  3. GRB 140419A: Swift-XRT refined Analysis
  4. GRB 140419A: Swift-BAT refined analysis
  5. GRB 140419A: Enhanced Swift-XRT position
  6. GRB140419A: UVOT detects fading afterglow in white but not in u filter
  7. GRB 140419A: ROTSE-III Detection of Optical Counterpart
  8. GRB 140419A (Swift trigger 596426) : KAIT optical candidate
  9. GRB 140419A: Swift detection of a burst with optical afterglow
  10. GRB 140414A: Swift/UVOT Upper Limit
  11. GRB 140414A: Swift-XRT observations
  12. GRB 140414A: Swift-BAT refined analysis
  13. GRB 140414A: Short burst found in ground analysis of BAT slew data
  14. GRB 140413A: Swift/UVOT Observations of the Optical Afterglow
  15. GRB 140412A: Swift/UVOT Upper Limits
  16. Konus-Wind observation of GRB 140413A
  17. GRB 140413A: Swift-XRT refined Analysis
  18. GRB 140413A: Swift-BAT refined analysis
  19. GRB 140412A: Swift-XRT refined Analysis
  20. GRB 140412A: Swift-BAT refined analysis
  21. GRB 140413A: TAROT La Silla observatory optical observations
  22. GRB 140413A: Swift-XRT observations
  23. GRB 140412A: Enhanced Swift-XRT position
  24. GRB 140413A: GROND afterglow candidate
  25. Swift Trigger 595616: a possible GRB
  26. GRB 140412A: Swift detection of a burst
  27. GRB 140408A: 1.5m OSN optical upper limit
  28. Swift Trigger 595345 is not an astrophysical source
  29. Swift-BAT trigger 595162 is noise
  30. GRB 140408A: RATIR Optical Upper Limits
  31. GRB 140408A: Swift-BAT refined analysis
  32. GRB 140408A: GROND Detection of an Afterglow Candidate
  33. GRB 140408A: Swift/UVOT Upper Limits
  34. GRB 140408A: Swift-XRT refined Analysis
  35. GRB 140408A: Enhanced Swift-XRT position
  36. GRB 140408A: Fermi GBM detection
  37. Swift Trigger 595162: a possible GRB
  38. GRB 140408A: Swift detection of a burst
  39. GRB 140402A: Deep limit on the optical afterglow from Magellan observations
  40. GRB 140402A: Swift/UVOT Upper Limits
  41. GRB 140331A: Continued RATIR Optical and NIR Observations
  42. GRB 140402A: Swift-XRT observations
  43. GRB 140402A: MASTER optical observations
  44. GRB 140402A BAT refined analysis
  45. GRB 140402A: Marginal BAT detection
  46. GRB 140402A: Fermi-LAT detection of a burst
  47. Swift trigger 594286: Is likely a noise trigger
  48. GRB 140331A: Swift-XRT refined Analysis
  49. GRB 140301A: Zadko observatory - Gingin optical observations
  50. GRB 140331A: Swift-BAT refined analysis
  51. GRB 140331A: Swift/UVOT Upper Limits
  52. GRB 140302A: TAROT La Silla observatory optical observations
  53. GRB 140323A: Zadko observatory - Gingin optical observations
  54. GRB 140331A: Zadko observatory - Gingin optical observations
  55. GRB 140129B: AAO optical upper limit
  56. GRB 140129A: Mondy optical observations
  57. GRB 140331A: Enhanced Swift-XRT position
  58. GRB 140331A: RATIR Optical and NIR Observations
  59. GRB 140331A: Swift detection of a burst
  60. GRB 140330A: Fermi-LAT Detection
  61. Swift trigger 593744: detection of a flare from UV Cet
  62. GRB 140323A : Suzaku WAM observation of the prompt emission
  63. Konus-Wind observation of GRB 140323A
  64. GRB 140323A: Fermi-LAT detection
  65. GRB 140323A: Swift-XRT refined Analysis
  66. GRB 140323A: Fermi GBM observation
  67. GRB 140323A: BOOTES-3 optical upper limit.
  68. GRB 140323A: Swift/UVOT Upper Limits
  69. GRB 140323A: Swift-BAT refined analysis
  70. GRB 140323A: Enhanced Swift-XRT position
  71. GRB 140323A: Swift detection of a burst
  72. GRB 140320A: RATIR Optical and NIR Observations
  73. IPN Triangulation of very intense GRB 140320D
  74. GRB 140320C: Swift/UVOT Upper Limits
  75. GRB 140320A: Swift-BAT refined analysis
  76. GRB 140320B: Swift/UVOT Upper Limits
  77. GRB 140320A: Swift/UVOT Upper Limits
  78. GRB 140320C: Swift-XRT observations
  79. GRB 140320A: Confirmation of a fading X-ray afterglow
  80. GRB 140320C: Swift-XRT detection of the X-ray afterglow
  81. GRB 140320A: Fermi GBM detection
  82. GRB 140320B: Swift-XRT detection of the afterglow
  83. GRB 140320A: Enhanced Swift-XRT position
  84. GRB 140320A: Swift-XRT detection of an afterglow candidate
  85. Swift Trigger 592558 is not an astrophysical source
  86. GRB 140320A: Fermi GBM observations suggest a short GRB
  87. GRB 140320A: Swift detection of a burst
  88. GRB 140318A: Mondy optical limit
  89. GRB 140318A: Swift/UVOT Upper Limits
  90. GRB 140318A: Swift-BAT refined analysis
  91. GRB 140311B: Mondy optical limit
  92. GRB 140311A: Mondy optical limits
  93. GRB 140318A: Swift-XRT refined Analysis
  94. GRB 140318A: Liverpool Telescope optical observations
  95. GRB 140318A: Enhanced Swift-XRT position
  96. GRB140318A: Discovery Channel Telescope Optical Detection
  97. GRB 140318A: Swift detection of a burst
  98. GRB140308A: Suzaku WAM observation of the prompt emission
  99. GRB 140311C: Swift-XRT and UVOT observations
  100. GRB 140311B: Swift-BAT refined analysis

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