Possible optical counterpart of SRGt J071522.1-191609
ATel #13663; D. Denisenko (SAI MSU)
on 24 Apr 2020; 11:41 UT
Credential Certification: Denis Denisenko (d.v.denisenko@gmail.com)
Subjects: Optical, X-ray, Nova, Transient
The location of new X-ray transient SRGt J071522.1-191609 (Gokus et al., ATel #13657) was observed with iTelescope.Net T17 instrument (0.43-m f/6.8 reflector + CCD) in Siding Spring, Australia. T17 image scale is 0.917 arc sec per pixel. Three sets of 60-sec exposures in Luminance, R and V filters were taken at 08:50-09:02 UT on 2020 Apr. 24. The combined images were compared to the scanned DSS Red plate taken on 1995-01-29 and IR plate on 1984-02-11. There is a possible new object at the following position (J2000.0): R.A. = 07 15 21.80, Decl. = -19 16 05.5 with the approximate magnitude 18.6 (unfiltered with the V zero point).
Additional three sets of 60-sec unfiltered exposures were then obtained at 09:40-09:52 UT with the same instrument. The combined T17 image (FWHM=3.2 arc sec) is posted at http://scan.sai.msu.ru/~denis/J071522-191609-T17-20200424.jpg and the color-combined DSS finder chart at http://scan.sai.msu.ru/~denis/J071522-191609-JRIR5x5.jpg (2x zoom with the inset of Pan-STARRS image).
The possible optical counterpart is strongly contaminated by the nearby star 2 arc sec to the West with position end figures 21.67, 06.22 (g=17.91 r=17.21 in Pan-STARRS DR1). The coordinates are within 2 arc sec of the Swift X-ray position (Bahramian et al., ATel #13661). Higher resolution imaging under the good seeing is required to confirm the new object and to obtain precise astrometry and photometry.
