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USNO B1 B1,B2,R1,R2,I 18.90, 18.45, 18.17, 17.15, 16.00 \\  NOMAD BV 18.35, 17.97 YB6 catalogue, unpublished)\\  Acero et al (2013) reported variability in X-rays (factor of five) and in   UV($Swift$ M2 filter) one magnitude, however in optical the varaibility might be more modest.  Historical data suggest some variability e.g. B: 18.65, 18.6, 18.90, 18.45, 18.25 and 19.27  R: 17.22, 17.7 18.17, 17.15, 17.97 but nothing dramatic, especially taking into account the   measuremnt measurement  errors 0.3-0.4 mag. Our own data from 07-2013 and 03-2014 show again some variability $\Delta R \sim$ 0.33 mag,  where the error estimate is $<<$ 0.1 mag (of the difference).