TITLE: GCN CIRCULAR NUMBER: 16911 SUBJECT: GRB 141015A: ISON-NM early optical observations DATE: 14/10/15 17:27:15 GMT FROM: Alexei Pozanenko at IKI, Moscow L. Elenin (KIAM), E. Mazaeva (IKI), 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 141015A (Troja et al., GCN 16909) with 0.4-m telescope of ISON-NM observatory starting on Oct., 15 (UT) 09:16:55, i.e. ~4 minutes after burst triger. We obtained 14 unfiltered images of 120 s exposure. We do not detect any source within XRT error circle (Troja et al., GCN 16910): UT start t-T0 Exp. Filter UL (3sigma) (mid.,days) (s) 09:16:55 0.0068 5*120 Clear 18.4 09:16:55 0.0131 14*120 Clear 19.0 The photometry is based on nearby USNO-B1.0 stars USNO-B1.0 RA DEC R2 1083-0107546 087,552978 +18,360067 14,78 1083-0107529 087,547650 +18,355839 15,18 1083-0107484 087,534895 +18,341425 15,00 1083-0107360 087,503081 +18,336089 14,71