GCN Circular 21805
Subject
GRB 170903A: UAFO /ISON optical upper limit
Date
2017-09-04T11:01:47Z (7 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), E. Chornaya (UAFO), A. Pozanenko (IKI), A. Volnova
(IKI), A. Matkin (UAFO), I. Molotov (KIAM) report on behalf of larger
GRB follow-up collaboration:
We observed the field of Swift GRB 170903A (Markwardt et al., GCN
21793) with SANTEL-650 (0.65m) telescope of UAFO/ISON-Ussuriysk
observatory. We obtained several unfiltered images starting on Sep. 03
(UT) 13:20:15. Within enhanced XRT position (Goad et al., GCN 21797) we
do not detect any source. Preliminary photometry of a combined image is
following
Date UT start t-T0 Filter Exp. OT Err. UL
(mid, days) (s)
2017-09-03 13:20:15 0.04847 CR 120*30 n/d n/d 20.4
Photometry is based on nearby SDSS DR9 stars
SDSS_DR9_id R(Lupton)
J165744.06+345751.4 16.01
J165803.01+345725.1 16.56
J165808.53+350159.7 15.58
J165749.08+345655.1 16.66
J165805.88+345230.1 16.24