[vsnet-grb-info 15719] GRB 141031B: TShAO optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17007
SUBJECT: GRB 141031B: TShAO optical upper limit
DATE:    14/10/31 20:03:58 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI),  A. Khruslov (INASAN), A. Volnova (IKI), A. Pozanenko 
(IKI) report on behalf of larger GRB follow-up collaboration:

We observed the field of the GRB 141031B (Gompertz et al., GCN 16998) 
with  Zeiss-1000 (East) 1m telescope of Tien Shan Astronomical 
Observatory on Oct., 31  starting on (UT) 15:39:02, i.e. ~0.7 hours 
after burst trigger. We took several images in R-filter of 600 exposure. 
In the first image we do not detect any object brighter than R=21.5 in 
XRT error circle (Gompertz et al., GCN 16998).

Details of the photometry are following:

date        UT start   t-T0       Filter  Exp. UL (3 sigma)
                       (mid, days)          (s)
2014-10-31 15:39:02    0.03284    R       600  21.5


The photometry is based on  nearby SDSS DR9 stars.