TITLE:   GCN CIRCULAR
NUMBER:  16948
SUBJECT: GRB 141020A: AAO optical upper limit
DATE:    14/10/25 00:48:28 GMT
FROM:    Alexei Pozanenko at IKI  <alex@grb.rssi.ru>

E. Mazaeva (IKI), R. Inasaridze (AAO), A. Volnova (IKI), Molotov (KIAM), 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 AS-32 (0.7m) telescope of Abastumani Observatory. We obtained several unfiltered images on Oct. 20 starting on (UT) 15:41:01.  At the position reported in (Kuin et al., GCN 16932) we do not detect the afterglow of GRB 141020A  (Cenko et al., GCN 16928; Kuin et al., GCN 16932; Mazaeva et al., GCN 16943). Preliminary photometry is following:

date        UT start  t-T0        Filter  Exp.    OT    UL(3sigma)
                      (mid, days)          (s)

2014-10-20  15:41:01  0.3630      clear   38*120  n/d   21.4

The photometry is based on SDSS stars reported in GCN 16943.