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TITLE: GCN CIRCULARNUMBER: 18211SUBJECT: GRB 150831A: optical upper limit ISON-SSODATE: 15/08/31 13:02:17 GMTFROM: Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>L. Elenin (KIAM), A. Volnova (IKI), E. Mazaeva (IKI), I. Molotov (KIAM),A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:We observed the field of Swift and INTEGRAL short GRB 150831A (Lien etal., GCN 18209; Mereghetti et al., GCN 18210) with with 0.4-m f/2.4telescope of ISON-SSO (Siding Spring Observatory) starting on Aug. 31(UT) 10:44:10 (i.e. 10 minutes after burst trigger). We obtained 30unfiltered images of 30 s exposure. We do not detect any optical sourcewithin XRT error circle (Lien et al., GCN 18209). Preliminary photometryof the filed is followingDate UT start t-T0 Filter Exp. UL (3 sigma) (mid, days) (s)2015-08-31 10:44:10 0.01299 none 30*30 18.8Photometry is based on nearby USNO-B1.0 stars (R2)
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