  The recent discovery of three Earth-sized, potentially habitable planets
around a nearby cool star, TRAPPIST-1, has provided three key targets for the
upcoming James Webb Space Telescope (JWST). Depending on their atmospheric
characteristics and precise orbit configurations, it is possible that any of
the three planets may be in the liquid water habitable zone, meaning that they
may be capable of supporting life. We find that present-day Earth levels of
ozone, if present, would be detectable if JWST observes 60 transits for
innermost planet 1b and 30 transits for 1c and 1d.
