  Transition-edge sensors (TES) are photon-number resolving calorimetric
spectrometers with near unit efficiency. Their recovery time, which is on the
order of microseconds, limits the number resolving ability and timing accuracy
in high photon-flux conditions. This is usually addressed by pulsing the light
source or discarding overlapping signals, thereby limiting its applicability.
We present an approach to assign detection times to overlapping detection
events in the regime of low signal-to-noise ratio, as in the case of TES
detection of near-infrared radiation. We use a two-level discriminator,
inherently robust against noise, to coarsely locate pulses in time, and
timestamp individual photoevents by fitting to a heuristic model. As an
example, we measure the second-order time correlation of a coherent source in a
single spatial mode using a single TES detector.
