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Aql X-1: new optical outburst

ATel #13981; O. I. Spiridonova, V. V. Vlasyuk, A. S.Moskvitin, O. A.Maslennikova, V. Aitov (Special Astrophysical Observatory of the Rus. Ac. Sci.)
on 30 Aug 2020; 12:00 UT
Credential Certification: Alexander Moskvitin (mosk@sao.ru)

Subjects: Optical, Binary, Transient

Within a course of optical monitoring campaign of Soft X-ray Transient (SXT) Aql X-1 performed with the 1-m SAO RAS optical telescope since end of April we have detected indications on start a new outburst. According to our preliminary results in R-bands, it's brightness increased between August 10th and 17th, as it was noted also in (ATel #13953). Our estimates of brightness of Aql X-1 optical counterpart in R-band in April-July were between 17.9 and 18.3 mag. Meanwhile, R-magnitude for epochs after August 17th demonstrated smooth trend for increasing, as seen in Table.
Date JD R_mag
20200810 2459072.2 18.30
20200817 2459079.2 17.65
20200818 2459080.2 17.60
20200820 2459082.3 17.55
20200829 2459091.2 17.20
Typical errors of brightness estimates are about 0.03-0.05 mag and should be decreased after more accurate data reduction. Measurements at August,29th had some worse accuracy due to bright sky background (near 0.1 mag). Further observations of Aql X-1 in X-ray, UV, Optical, IR and Radio ranges are highly encouraged.