  GRB 130925A is an ultra-long GRB, and it shows clear evidences for a thermal
emission in the soft X-ray data of \emph{Swift}/XRT ($\sim0.5$\,keV), lasting
till the X-ray afterglow phase. Due to the long duration of the GRB, the burst
could be studied in hard X-rays with high-resolution focusing detectors
(\emph{NuSTAR}). The blackbody temperature, as measured by the
\emph{Swift}/XRT, shows a decreasing trend till the late phase (Piro et al.
2014) whereas the high-energy data reveals a significant blackbody component
during the late epochs at an order of magnitude higher temperature
($\sim5$\,keV), as compared to the contemporaneous low energy data (Bellm et
al. 2014). We resolve this apparent contradiction by demonstrating that a model
with two black bodies and a power-law (2BBPL) is consistent with the data right
from the late prompt emission to the afterglow phase. Both the blackbodies show
a similar cooling behaviour upto the late time. We invoke a structured jet,
having a fast spine and a slower sheath layer, to identify the location of
these blackbodies. Independent of the physical interpretation, we propose that
the 2BBPL model is a generic feature of the prompt emission of all long GRBs,
and the thermal emission found in the afterglow phase of different GRBs
reflects the lingering thermal component of the prompt emission with diverse
time-scales. We strengthen this proposal by pointing out a close similarity
between the spectral evolutions of this GRB and GRB~090618, a source with
significant wide band data during the early afterglow phase.
