  Extended emission episodes with intensity above the pre-burst level are
observed following magnetar bursts from a number of soft gamma repeaters (SGRs)
and anomalous X-ray pulsars (AXPs). Such extended tail emission were observed
subsequent to two events detected from AXP 4U 0142+61. We investigated in
detail the evolution of spectral and temporal properties during these two tail
segments using RXTE/PCA observations, and report distinct variations both in
the spectral and temporal behavior throughout the tails. In particular, sudden
enhancement of pulsation amplitude in conjunction with bursts, and smooth
decline of X-ray emission (cooling) during the tail were observed in both
cases. We suggest that an inefficiently radiating trapped fireball formed
during the burst, which can heat up the stellar surface, is able to explain the
tail properties and its energetics. We also present the episodic detection of
absorption and emission features during tails. One possible mechanism that has
been proposed to give rise to such spectral lines is the proton/ion cyclotron
resonance process which has been suggested to offer a valuable tool in probing
the complex magnetic field of magnetars.
