GCN Circular 19483
E. Mazaeva (IKI), E. Klunko (ISTP), A. Volnova (IKI), I. Korobtsev (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 160601A (Kocevski et al., GCN 19478) with AZT-33IK telescope of Sayan observatory (Mondy) starting on June, 01 (UT) 15:00:41. We obtained several images in R-filter under good weather conditions and FWHM of 1.5 arcsec. Using only part of images available we marginally detect (S/N ~2) a source at the edge of Swift-XRT position (Kocevski et al., GCN 19478). Coordinates of the source are (J2000) 15:39:44.43 +64:32:19.3 with uncertainty of 1 arcsec. Preliminary photometry of the source is R~22.3, and details of observations are following Date UT start t-T0 Filter Exp. OT(?) UpperLimit (3 sigma) (mid, days) (s) 2016-06-01 15:00:41 0.03026 R 16*60 22.3 21.8 Photometry is based on nearby SDSS-DR9 stars, Lupton transformations into R: SDSS-DR9_id R(Lupton) J153959.67+643325.7 16.72 J153956.37+643102.2 17.00 J153931.88+643247.0 17.02 J153927.50+643304.3 19.23 J153942.70+643016.4 16.27 We will update the results after all the data will be available.