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We propose a method for the flux calibration of reverberation mapping spectrabased on accurate measurement of [O III] $\lambda 5007$ emission by spectralfitting. The method can achieve better accuracy than the traditional method ofvan Groningen & Wanders (1992), allowing reverberation mapping measurements forobject with variability amplitudes as low as $\sim$ 5%. As a demonstration, wereanalyze the data of the Seyfert 1 galaxy MCG--6-30-15 taken from the 2008campaign of the Lick AGN Monitoring Project, which previously failed to obtaina time lag for this weakly variable object owing to a relatively large fluxcalibration uncertainty. We detect a statistically significant rest-frame timelag of $6.38_{-2.69}^{+3.07}$ days between the H$\beta$ and $V$-band lightcurves. Combining this lag with FWHM(H$\beta$) = $1933\pm81$ $\rm km~s^{-1}$and a virial coefficient of $f$ = 0.7, we derive a virial black hole mass of$3.26_{-1.40}^{+1.59}\times10^6$ $M_{\odot}$, which agrees well with previousestimates by other methods.

Improving the Flux Calibration in Reverberation Mapping by Spectral Fitting: Application to the Seyfert Galaxy MCG--6-30-15