GCN Circular 15171
Subject
GRB 130903A: ISON-Kislovodsk optical Upper Limits
Date
2013-09-03T13:21:41Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), V. Nevskiy (ISON), I. Molotov (KIAM), A. Pozanenko
(IKI), report on behalf of larger collaboration:
We observed the field of GRB 130903A (INTEGRAL trigger 6930; Mereghetti et
al. 2013, GCN 15169) with SANTEL-400AN (0.4-m f/3) telescope of
ISON-Kislovodsk observatory.Observations started on Sep. 09 (UT) 01:11:40,
i.e. 34 minutes after burst triger. We obtained several unfiltered images
of 100 s exposure. We do not detect any source within 1.5 arcmin of error
circle localization (Mereghetti et al. 2013, GCN 15169) . Photometry of
combined image is following
T_start, T0+, Exp., Filter, UL (3 sigma)
(UT) mid (d) (s)
01:11:40T01:11:40 0.02363 1000 none >19.6
and based on SDSS stars, R (gri -> R transformations by Lupton 2005):
# SDSS R Err_R
1 J052835.34-000624.7 15.543 0.013
2 J052817.12-000749.0 14.650 0.012
3 J052841.64-000642.3 14.233 0.013
Within error circle (Mereghetti et al. 2013, GCN 15169) we note a presence
of probable bright galaxy J052830.20-000723.9 r=19.706
(however marked in SDSS-DR9 as point like object).