Аннотация:MASTER-OAGH (located at The Guillermo Haro Astrophysics Observatory, Mexico http://oagh.master.sai.msu.ru :3422 )reports on the detection of an optical flare from the FSRQ TXS 1520+344.Fermi-LAT collaboration reported that the FSRQ TXS 1520+344 (R. A., Decl. = 230.72866 deg, +34.23586 deg, Petrov & Taylor 2011, AJ, 142, 89) was experiencing a gamma-ray flare on May 5, 2022 (ATel #15367).To investigate the possibility of a multiwavelength flare, the newest installation of MASTER telescopes, MASTER-OAGH, observed the blazar on May 7 2022, from 04:41 UT to 05:45 UT and made 8 images of this object.We detect it at W=17.99 +/- 0.08 (unfiltered) and do not register any significant variability on such a period.On April 25, 2019 at 20:33 UT, MASTER-Kislovodsk imaged this blazar. It was detected at W=19.20 +/- 0.27.If this is considered as a quiescence state then the amplitude of the flare is 1.2 mag at the level of 5.6 sigma.From this we can say that TXS 1520+344 currently undergoes a multiwavelength flare.We encourage further multiwavelength observations of the object.