Optical photometry of the X-ray/optical transient SRGe J195057.5+672122

ATel #13990; I. Zaznobin (1), M. Eselevich (2), R. Burenin (1), S. Sazonov (1), M. Gilfanov (1, 3), R. Sunyaev (1, 3) (1: IKI RAN, Moscow, 2: ISZF SO RAN, Irkutsk, 3: MPA, Garching)
on 4 Sep 2020; 16:59 UT
Credential Certification: Rodion Burenin (rodion@hea.iki.rssi.ru)

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We obtained direct optical images of the field of X-ray/optical transient, possible hypernova SRGe J195057.5+672122 (Sazonov et al., ATel #13987) with Sayan observatory 1.6-m telescope (AZT-33IK), using CCD photometer based on focal reducer and Andor iKon-M CCD.

The observations were started at UT 2020-09-03, 13:50. We obtained a series of 60 s exposure images in g and r bands under 1.2 arcsec seeing conditions. The photometric measurements are g = 22.75 +/- 0.13, r = 22.13 +/- 0.07 (using PS1 DR2 secondary standards). Therefore, the source has further faded since its previous observation on August 17. Our r-band photometric measurements are in good agreement with those reported by Daniel Perley (ATel #13989) for the same night.

We also note that in our previous report on this sources (Sazonov et al., ATel #13987), there was a typo in the wavelength of one of the absorption lines. The text should read: We can discern two absorption lines at 5159A and 5224A in the spectrum taken with the BTA 6-m telescope on August 17, 2020.