GCN Circular 18211
Subject
GRB 150831A: optical upper limit ISON-SSO
Date
2015-08-31T13:02:17Z (9 years ago)
From
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 150309A (Lien et
al., GCN 18209; Mereghetti et al., GCN 18210) with with 0.4-m f/2.4
telescope of ISON-SSO (Siding Spring Observatory) starting on Aug. 31
(UT) 10:44:10 (i.e. 10 minutes after burst trigger). We obtained 30
unfiltered images of 30 s exposure. We do not detect any optical source
within XRT error circle (Lien et al., GCN 18209). Preliminary photometry
of the filed is following
Date UT start t-T0 Filter Exp. UL (3 sigma)
(mid, days) (s)
2015-08-31 10:44:10 0.01299 none 30*30 18.8
Photometry is based on nearby USNO-B1.0 stars (R2)