TITLE:   GCN CIRCULAR
NUMBER:  23479
SUBJECT: GRB 181201A: Zeiss-1000/CrAO optical observations
DATE:    18/12/01 23:21:37 GMT
FROM:    Alina Volnova at SAI MSU  <alinusss@gmail.com>

E. Mazaeva (IKI), A. Volnova (IKI), A. Pozanenko (IKI), I. Nikolenko
(CrAO),
A. Novichonok (KIAM, PetrSU), I. Molotov (KIAM)
report on behalf of larger GRB follow-up collaboration:

We observed the field of the INTEGRAL GRB 181201A (Mereghetti et al.,
GCN 23469) with Zeiss-1000/Koshka (CrAO) telescope starting Dec 01,
16:55:28 UT. We obtained several frames in R filter. The optical
afterglow (Podesta et al., GCN  23470; Kong, GCN 23475) is clearly
detected in the stacked frame. Preliminary photometry is following:

Date             UT start   t-T0            Filter   Exp.     OT      Err.
                                   (mid, days)            (s)
2018-12-01 16:55:28  0.60359      R        23*60   17.17   0.05

The photometry is based on  SDSS DR12 nearby stars.