The LSST SIM data are accessible by a variety of means:
Data Lab Table Access Protocol (TAP) service
TAP provides a convenient access layer to the LSST SIM catalog database. TAP-aware clients (such as TOPCAT) can point to https://datalab.noirlab.edu/tap, select the lsst_sim database, and see the database tables and descriptions. lsst_sim contains a tables named simdr1(obsolete), simdr2, and simdr2_binary, which are described in the Data Lab table browser.
Data Lab Query Manager
The Query Manager is available as part of the Data Lab software distribution. The Query Manager client provides a Python API to Data Lab database services. These services include anonymous access through synchronous queries of the catalog made directly to the database as well as authenticated access, asynchronous queries, personal database storage, and storage through the Data Lab VOSpace.
Jupyter Notebook Server
The Data Lab Jupyter Notebook server (user authenticated service) contains examples of how to access and visualize the LSST SIM catalog.