[vsnet-grb-info 15658] GRB 141020A: Khureltogot optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16947
SUBJECT: GRB 141020A: Khureltogot optical upper limit
DATE:    14/10/25 00:46:27 GMT
FROM:    Alexei Pozanenko at IKI  <alex at grb.rssi.ru>

E. Mazaeva (IKI), S. Schmalz (AIP), N. Tungalag (Research Center of Astronomy and Geophysics MAS),  A. Volnova (IKI), I.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 ORI-40 telescope of Khureltogot observatory. We obtained several unfiltered images on Oct. 20 starting on (UT) 12:09:56.  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  12:09:56  0.2037     clear   60*60  n/d   19.8

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