TITLE:   GCN CIRCULAR
NUMBER:  27982
SUBJECT: GRB 200613A: SAO RAS optical observations
DATE:    20/06/18 18:15:13 GMT
FROM:    Moskvitin Alexander at SAO RAS  <mosk@sao.ru>

A. Moskvitin (SAO RAS) on behalf of the larger GRB follow-up team
report.

We observed the field of the GRB 200613A (Fermi GBM team, GCN 27926;
Bissaldi et al., GCN 27930; Ohno et al., GCN 27931; Ohno et al.,
GCN 27964) with the 1m telescope of SAO RAS, Zeiss-1000,
equipped with the Multi-Mode Photometer-Polarimeter (MMPP).
We obtained 6 x 300 sec. images in Rc band on 2020.06.16
19:05:00--19:45:16 UT, T_mid - T0 = 3.5799 days.

The optical afterglow (Kann et al., GCN 27935; Pozanenko et al.,
GCN 27937; Izzo et al., GCN 27939; Zhu et al., GCN 27943;
Marshall, GCN 27944; Liu et al., GCN 27949; Belkin et al., GCN 27958;
Fu et al., GCN 27971; Belkin et al., GCN 27978) is clearly visible
in individual images and stacked frame with the brightness of
R = 20.58 +/- 0.05.

The photometry is based on nearby SDSS DR12 stars
SDSS_id        R(Lupton)
J101206.52+454606.4 14.962
J101207.75+454443.4 17.877
J101220.88+454613.5 16.508
J101211.59+454721.5 18.659
J101209.58+454817.4 18.076