  The Neutron Star Interior Composition Explorer (NICER) presents an exciting
new capability for exploring the modulation properties of X-ray emitting
neutron stars, including large area, low background, extremely precise absolute
event time stamps, superb low-energy response and flexible scheduling. The
Pulsation Searches and Multiwavelength Coordination working group has designed
a 2.5 Ms observing program to search for emission and characterize the
modulation properties of about 30 known or suspected neutron star sources
across a number of source categories. A key early goal will be to search for
pulsations from millisecond pulsars that might exhibit thermal pulsations from
the surface suitable for pulse profile modeling to constrain the neutron star
equation of state. In addition, we will search for pulsations from transitional
millisecond pulsars, isolated neutron stars, low-mass X-ray binaries (LMXBs),
accretion-powered millisecond pulsars, central compact objects and other
sources. We present our science plan and initial results from the first months
of the NICER mission, including the discovery of pulsations from the
millisecond pulsar J1231-1411.
