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Detection of a possible new outburst in Aql X-1

ATel #10441; V. V. Vlasyuk, O. I. Spiridonova (Special Astrophysical Observatory of the Rus. Ac. Sci.)
on 30 May 2017; 13:01 UT
Credential Certification: Alexander Moskvitin (mosk@sao.ru)

Subjects: Optical, X-ray, Binary, Transient

Referred to by ATel #: 10450, 10452, 10541

During optical monitoring campaign of Soft X-ray Transient (SXT) Aql X-1 performed at 1-m SAO RAS optical telescope in May we detected some features of a new outburst. According to our preliminary results in BVR-bands, it's brightness increased within last few days. Magnitudes of Aql X-1 optical counterpart in R-band were equal to 17m.55 and 17m.60 at May 28/29 and May 29/30 nights, respectively. Typical errors of brightness estimates are about 0m.05 and should be decreased after more accurate data reduction. Our earlier data from May 16/17 night showed it's apparent brightness near a typical quiescence level. Further observations of Aql X-1 in X-ray, UV, Optical, IR and Radio ranges are highly encouraged.