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We report MAXI and Swift observations of short-term spectral softenings ofthe galactic black-hole X-ray binary Swift J1753.5-0127 in the low/hard state.These softening events are characterized by a simultaneous increase of softX-rays (2-4 keV) and a decrease of hard X-rays (15-50 keV) lasting for a fewtens of days. The X-ray energy spectra during the softening periods can bereproduced with a model consisting of a multi-color disk blackbody and itsComptonized component. The fraction of the Comptonized component decreased from0.30 to 0.15 when the spectrum became softer; meanwhile the inner disktemperature (Tin) increased from 0.2 to 0.45 keV. These results imply that thesoftening events are triggered by a short-term increase of the mass accretionrate. During the observed spectral softening events, the disk flux (F) and Tindid not obey the relation: F is proportional to Tin^4, suggesting that theinner disk radius does not reach the innermost stable circular orbit.

Repeated Short-term Spectral Softening in the Low/Hard State of the Galactic Black-Hole Candidate Swift J1753.5-0127