Launch Jupyter notebook from Sage?

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When starting the SageMath REPL, the user is reminded how to launch the Sage Notebook:

$ sage
┌────────────────────────────────────────────────────────────────────┐
│ SageMath Version 6.9, Release Date: 2015-10-10                     │
│ Type "notebook()" for the browser-based notebook interface.        │
│ Type "help()" for help.                                            │
└────────────────────────────────────────────────────────────────────┘
sage:

Is there a command to launch the Jupyter Notebook (formerly IPython Notebook) from Sage?