TITLE:   GCN CIRCULAR
NUMBER:  37910
SUBJECT: EP241021a: further SAO RAS optical observations
DATE:    24/10/27 15:01:01 GMT
FROM:    Moskvitin Alexander at SAO RAS <mosk@sao.ru>

A. S. Moskvitin and O. I. Spiridonova (SAO RAS), report
on behalf of the GRB follow-up team.

We observed the field of  X-ray transient EP241021a (Hu et al.,
GCN 37834) with the 1-m telescope of SAO RAS equipped with
CCD-photometer. We obtained 12 x 300 sec. images in Rc band
on October 26, 20:39:47--21:53:44 UT (t_mid - T0 = 5.6728 days).

We detect the OT (Fu et al., GCNs 37840, 37842; Li et al.,
GCNs 37844, 37846; Ror et al., GCN 37845; Zheng et al., GCN 37849;
Moskvitin & Spiridonova, GCN 37850; Pugliese et al., GCN 37852;
Pérez-Fournon et al., GCN 37858; Bochenek & Perley, GCN 37869;
Kumar et al., GCN 37875; Busmann et al., GCN 37877; J-Jin et al.,
GCN 37892) in our stacked frame with the brightness of
R = 23.10 +/- 0.18 calibrated against nearby SDSS stars
(magnitudes converted with Lupton 2005 equations)
and not corrected for the Galactic extinction.