TITLE:   GCN CIRCULAR
NUMBER:  16943
SUBJECT: GRB 141020A: Mondy optical observations
DATE:    14/10/22 18:36:37 GMT
FROM:    Alexei Pozanenko at IKI  <alex@grb.rssi.ru>

E. Mazaeva (IKI), E. Klunko (ISTP),  A. Volnova (IKI), M. Eselevich (ISTP), I. Korobtsev (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:

We observed the field of the Swift GRB 141020A  (Cenko et al., GCN 16928) with with AZT-33IK telescope of Sayan observatory (Mondy). We obtained several images on Oct. 20 starting on (UT) 13:28:20.  At the position reported in (Kuin et al., GCN 16932) we clearly detect the afterglow of GRB 141020A  (Cenko et al., GCN 16928; Kuin et al., GCN 16932). Preliminary photometry is following:

date        UT start  t-T0        Filter  Exp.    OT      OT_err
                      (mid, days)          (s)

2014-10-20  13:28:20  10.2672     R       45*120   22.0   0.3
 

The photometry is based on SDSS stars

SDSS                     R_Lupton

J150002.80+552112.7      16.749
J150012.34+552137.2      17.210
J150017.07+551830.3      18.482
J150000.59+552221.9      17.001 

The finding chart can be found in
http://grb.rssi.ru/GRB141020A/GRB141020A_R_AZT33IK_fc.png